To display Cisco Express Forwarding for IPv6 (CEFv6) and distributed CEFv6 (dCEFv6) traffic statistics, use the
showipv6ceftrafficprefix-lengthcommand in user EXEC or privileged EXEC mode.
showipv6ceftrafficprefix-length
Syntax Description
This command has no arguments or keywords.
Command Modes
User EXEC
Privileged EXEC
Command History
Release
Modification
12.0(22)S
This command was introduced.
12.2(13)T
This command was integrated into Cisco IOS Release 12.2(13)T.
12.2(14)S
This command was integrated into Cisco IOS Release 12.2(14)S.
12.2(28)SB
This command was integrated into Cisco IOS Release 12.2(28)SB.
12.2(33)SRA
This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(33)SXH
This command was integrated into Cisco IOS Release 12.2(33)SXH.
12.4(20)T
This command was integrated into Cisco IOS Release 12.4(20)T.
Usage Guidelines
The
showipv6ceftrafficprefix-lengthcommand is similar to the
showipceftrafficprefix-lengthcommand, except that it is IPv6-specific.
This command is used to display CEFv6 switched traffic statistics by destination prefix length. The
ipv6cefaccountingprefix-length command must be enabled for the counters to increment.
Examples
The following is sample output from the
showipv6ceftrafficprefix-lengthcommand:
The table below describes the significant fields shown in the display.
Table 1 show ipv6 cef traffic prefix-length Field Descriptions
Field
Description
Prefix Length
Destination IPv6 prefix length for Cisco Express Forwarding switched traffic.
Number of Packets
Number of packets forwarded for the specified IPv6 prefix length.
Number of Bytes
Number of bytes sent for the specified IPv6 prefix length.
Related Commands
Command
Description
ipv6cefaccounting
Enables CEFv6 network accounting.
showipv6cef
Displays entries in the IPv6 FIB.
showipv6cefsummary
Displays a summary of the entries in the IPv6 FIB.
show ipv6 cef tree
To display summary information on the default tree in the IPv6 Forwarding Information Base (FIB), use the
showipv6ceftreecommand in user EXEC or privileged EXEC mode.
(Optional) Displays the dependents of the selected tree with optional prefix filter.
prefix-filter
(Optional) A prefix filter on the dependents of the selected tree.
Command Modes
User EXEC
Privileged EXEC
Command History
Release
Modification
12.2(25)S
This command was introduced.
12.2(28)SB
This command was integrated into Cisco IOS Release 12.2(28)SB.
12.2(33)SRA
This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(33)SXH
This command was integrated into Cisco IOS Release 12.2(33)SXH.
Usage Guidelines
If none of the optional keywords or arguments is used, all summary information on the default tree in the IPv6 FIB is shown.
Examples
The following is sample output from theshowipv6ceftreecommand:
Router# show ipv6 cef tree
VRF Default tree information:
RTRIE storing IPv6 addresses
6 entries (6/0 fwd/non-fwd)
Forwarding & Non-forwarding tree:
6 inserts, 0 delete
8 nodes using 288 bytes
The table below describes the significant fields shown in the display.
Table 2 show ipv6 cef tree Field Descriptions
Field
Description
RTRIE storing IPv6 addresses
Indicates the tree type as RTRIE.
6 entries (6/0 fwd/non-fwd)
Indicates total number of prefix entries as 6 forwarding and 0 nonforwarding entries.
Forwarding & Non-forwarding tree
Same tree is used for forwarding and nonforwarding.
6 inserts, 0 delete
Indicates that 6 entries were inserted and 0 entries were deleted from the tree.
8 nodes using 288 bytes
Indicates a total of 8 nodes using a total of 288 bytes of memory.
*calloc failures:
number node
This line is not present in the example output.
If this line is present in output, it indicates a memory allocation error at the indicated node.
Related Commands
Command
Description
showipv6cef
Displays entries in the IPv6 FIB.
show ipv6 cef unresolved
To display unresolved entries in the IPv6 Forwarding Information Base (FIB), use the
showipv6cefunresolvedcommand in user EXEC or privileged EXEC mode.
(Optional) Displays data structures for unresolved routes.
samecable
(Optional) Displays the connected (up) interface for unresolved routes.
platform
(Optional) Displays platform-specific information on unresolved routes.
source
(Optional) Displays source-specific information on unresolved routes.
epochepoch-number
(Optional) Displays the basic unresolved routes filtered by a specified epoch number. The epoch number range is from 0 to 255.
Command Modes
User EXEC
Privileged EXEC
Command History
Release
Modification
12.0(22)S
This command was introduced.
12.2(13)T
This command was integrated into Cisco IOS Release 12.2(13)T.
12.2(14)S
This command was integrated into Cisco IOS Release 12.2(14)S.
12.2(25)S
The
internal,
samecable,
platform,
source, and
epoch keywords were added. The
epoch-number argument was added.
12.2(28)SB
This command was integrated into Cisco IOS Release 12.2(28)SB.
12.2(33)SRA
This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(33)SXH
This command was integrated into Cisco IOS Release 12.2(33)SXH.
12.4(20)T
This command was integrated into Cisco IOS Release 12.4(20)T.
Usage Guidelines
The
showipv6cefunresolvedcommand is similar to the
showipcefunresolvedcommand, except that it is IPv6-specific.
The
showipv6cefunresolveddetail command displays detailed information for all unresolved FIB entries.
Examples
The following is sample output from theshowipv6cefunresolvedcommand with the
detail keyword:
Router# show ipv6 cef unresolved detail
IPv6 CEF is enabled for distributed and running
VRF Default:
5 prefixes (5/0 fwd/non-fwd)
Table id 0, version 5, 0 resets
Database epoch: 2 (5 entries at this epoch)
The table below describes the significant fields shown in the display.
Table 3 show ipv6 cef unresolved Field Descriptions
Field
Description
5 prefixes (5/0 fwd/non-fwd)
Indicates how many IPv6 prefixes are being used for forwarding or not forwarding.
Table id 0, version 5, 0 resets
Provides information about the Cisco Express Forwarding table.
Database epoch: 2 (5 entries at this epoch)
The epoch number of any unresolved database epochs.
This is an example of the
showipv6cefunresolveddetailcommand output in Cisco IOS Releases 12.2(25)S, 12.2(28)SB, 12.2(33)SRA, 12.2(33)SXH, 12.4(20)T, and later releases:
Router# show ipv6 cef unresolved detail
No unresolved adjacencies exist, therefore nothing is displayed in the output of theshowipv6cefunresolveddetailcommand.
Displays a summary of the entries in the IPv6 FIB.
show ipv6 cef vrf
To display the Cisco Express Forwarding Forwarding Information Base (FIB) associated with an IPv6 Virtual Private Network (VPN) routing and forwarding (VRF) instance, use the
showipv6cefvrfcommand in user EXEC or privileged EXEC mode.
showipv6cefvrf
[ vrf-name | * | internal ]
Syntax Description
vrf-name
(Optional) Name assigned to the VRF.
*
(Optional) All VRFs are displayed.
internal
(Optional) Only internal data is displayed.
Command Modes
User EXEC
Privileged EXEC
Command History
Release
Modification
12.2(33)SRB
This command was introduced.
12.2(33)SRB1
This command was integrated into Cisco IOS Release 12.2(33)SRB1.
12.2(33)SXH
This command was integrated into Cisco IOS Release 12.2(33)SXH.
12.2(33)SB
This command was integrated into Cisco IOS Release 12.2(33)SB.
15.2(2)SNI
This command was implemented on the Cisco ASR 901 Series Aggregation Services Routers.
Usage Guidelines
Use the
showipv6cefvrf command to display content of the IPv6 FIB for the specified VRF.
Examples
The following is sample output from a Cisco Express Forwarding FIB associated with a VRF named cisco1:
Router# show ipv6 cef vrf cisco1
2001:8::/64
attached to FastEthernet0/0
2001:8::3/128
receive
2002:8::/64
nexthop 10.1.1.2 POS4/0 label 22 19
2010::/64
nexthop 2001:8::1 FastEthernet0/0
2012::/64
attached to Loopback1
2012::1/128
receive
The table below describes the significant fields shown in the display.
Table 4 show ipv6 cef vrf Field Descriptions
Field
Description
2001:8::/64
Specifies the network prefix.
attached to FastEthernet0/0
Specifies the VRF interface.
nexthop 10.1.1.2 POS4/0 label 22 19
Specifies the BGP next hop address.
show ipv6 cef with epoch
To display Cisco Express Forwarding IPv6 Forwarding Information Base (FIB) information filtered for a specific epoch, use the
showipv6cefwithepoch command in privileged EXEC mode.
(Optional) Displays detailed information about FIB epochs.
internal
(Optional) Displays internal data structure information.
platform
(Optional) Displays platform-specific data structures.
Command Modes
Privileged EXEC (#)
Command History
Release
Modification
12.2(25)S
This command was introduced.
12.2(28)SB
This command was integrated into Cisco IOS Release 12.2(28)SB.
12.2(33)SRA
This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(33)SXH
This command was integrated into Cisco IOS Release 12.2(33)SXH.
12.4(20)T
This command was integrated into Cisco IOS Release 12.4(20)T.
Usage Guidelines
Use this command to display information about prefix properties for a specified epoch in the Cisco Express Forwarding IPv6 FIB. This command is similar to theshowipcefwithepoch command, except that it is IPv6 specific. Use the
showipv6cefepochcommand to display entries filtered by epoch number.
Examples
The following is sample output from the
showipv6cefwithepochcommand:
Router# show ipv6 cef with epoch 0
::/0
no route
::/127
discard
2000::1/128
receive for Loopback0
2000::2/128
nexthop FE80::A8BB:CCFF:FE00:2500 Ethernet0/0
2000::3/128
nexthop FE80::A8BB:CCFF:FE00:2602 Ethernet2/0
2000::4/128
nexthop FE80::A8BB:CCFF:FE00:2602 Ethernet2/0
2001::/64
attached to Ethernet2/0
2001::1/128
receive for Ethernet2/0
2001::3/128
attached to Ethernet2/0
2001:1::/64
attached to Ethernet0/0
2001:1::1/128
receive for Ethernet0/0
2001:2::/64
nexthop FE80::A8BB:CCFF:FE00:2602 Ethernet2/0
2002::/64
attached to Tunnel0
2002::1/128
receive for Tunnel0
FE80::/10
receive for Null0
FF00::/8
receive for Null0
The table below describes significant fields shown in the display.
Table 5 show ipv6 cef with epoch Field Descriptions
The table below describes significant fields shown in the display.
Table 7 show ipv6 cef with epoch checksum Field Descriptions
Field
Description
::/0
Default route handler. ::/0 prefix matches all addresses. ( ::/128 prefix is an exact match for all zero addresses only.)
FIB checksum: 0x64E25610
FIB checksum associated with the named prefix.
Related Commands
Command
Description
showipcefwithepoch
Displays Cisco Express Forwarding FIB information filtered for a specific epoch.
showipv6cef
Displays entries in the IPv6 FIB.
showipv6cefepoch
Displays a summary of IPv6 FIB epoch information.
show ipv6 cef with source
To display Cisco Express Forwarding IPv6 Forwarding Information Base (FIB) filtered for a specific source, use the
showipv6cefwithsource command in privileged EXEC mode.
The
source-typeargument must be replaced by one of the following keywords that are supported for your release.
Keywords for all supported Cisco IOS releases:
alias--Displays alias address prefix sources in the Cisco Express Forwarding IPv6 FIB.
broadband--Displays broadband receive prefix sources in the Cisco Express Forwarding IPv6 FIB.
fallback--Displays fallback lookup prefix sources in the Cisco Express Forwarding IPv6 FIB.
interface--Displays interface configuration prefix sources in the Cisco Express Forwarding IPv6 FIB.
nat--Displays Network Address Translation (NAT) prefix sources in the Cisco Express Forwarding IPv6 FIB.
rib--Displays Routing Information Base (RIB) prefix sources in the Cisco Express Forwarding IPv6 FIB.
special--Displays special prefix sources in the Cisco Express Forwarding IPv6 FIB.
test--Displays test command prefix sources in the Cisco Express Forwarding IPv6 FIB.
virtual--Displays virtual address prefix sources in the Cisco Express Forwarding IPv6 FIB, for example, Virtual Router Redundancy Protocol (VRRP) and Hot Standby Router Protocol (HSRP) addresses.
Additional keywords for Cisco IOS Releases 12.2(25)S, 12,2(28)SB, 12.2(33)SRA, and later SB and SR releases:
adjacency--Displays adjacency prefix sources in the Cisco Express ForwardingIPv6 FIB.
default-route--Displays default route handler prefix sources in the Cisco Express Forwarding FIB.
inherited-path-list--Displays inherited path list prefix source in the Cisco Express Forwarding FIB.
Additional keywords for Cisco IOS Releases 12.2(33)SXH, 12.4(20)T, and later SX and T releases:
adj--Displays adjacency prefix sources in the Cisco Express Forwarding FIB.
-
defnet--Displays default network prefix sources in the Cisco Express Forwarding IPv6 FIB.
defroutehandler--Displays default route handler prefix sources in the Cisco Express Forwarding IPv6 FIB.
ipl--Displays inherited path list prefix source in the Cisco Express ForwardingIPv6 FIB.
recursive-resolution--Displays recursive resolution prefix sources in the Cisco Express Forwarding IPv6 FIB.
Additional keyword for Cisco IOS Release 12.2(33)SXH and later SX releases:
An IPv6 prefix that is forwarded to a next-hop address (FE80::A8BB:CCFF:FE00:2500) through interface Ethernet 0/0.
2001::/64 attached for Ethernet2/0
An IPv6 prefix that is a connected network on interface Ethernet 0/0. That is, the destination can be reached directly through the specified interface.
The following is sample output from the
showipv6cefwithsourcefibdetail command:
Router# show ipv6 cef with source rib detail
IPv6 CEF is enabled and running centrally.
VRF base:
16 prefixes (16/0 fwd/non-fwd)
Table id 0
Database epoch: 0 (16 entries at this epoch)
::/127, epoch 0, flags attached, discard
discard
2000::1/128, epoch 0, flags attached, connected, receive, local
receive for Loopback0
2000::2/128, epoch 0
nexthop FE80::A8BB:CCFF:FE00:2500 Ethernet0/0
2000::3/128, epoch 0, flags rib only nolabel, rib defined all labels
nexthop FE80::A8BB:CCFF:FE00:2602 Ethernet2/0
2000::4/128, epoch 0, flags rib only nolabel, rib defined all labels
nexthop FE80::A8BB:CCFF:FE00:2602 Ethernet2/0
2001::/64, epoch 0, flags attached, connected, cover dependents
Covered dependent prefixes: 1
notify cover updated: 1
attached to Ethernet2/0
2001::1/128, epoch 0, flags attached, receive, local
receive for Ethernet2/0
2001:1::/64, epoch 0, flags attached, connected
attached to Ethernet0/0
2001:1::1/128, epoch 0, flags attached, receive, local
receive for Ethernet0/0
2001:2::/64, epoch 0, flags rib only nolabel, rib defined all labels
nexthop FE80::A8BB:CCFF:FE00:2602 Ethernet2/0
2002::/64, epoch 0, flags attached, connected
attached to Tunnel0
2002::1/128, epoch 0, flags attached, receive, local
receive for Tunnel0
FE80::/10, epoch 0, flags attached, receive, local
receive for Null0
FF00::/8, epoch 0, flags attached, receive, local
receive for Null0
The table below describes the significant fields shown in the display.
Table 9 show ipv6 cef with source rib detail Field Descriptions
Field
Description
IPv6 CEF is enabled and running centrally.
Verifies that Cisco Express Forwarding for IPV6 is enabled globally.
VRF base
Base VRF table.
16 prefixes (16/0 Fwd/non-fwd)
Number of prefixes in the VRF, how many prefixes are forwarded, and how many are not forwarded.
Table id 0
Identifies the table by number.
Database epoch:
Specifies the type of epoch.
0 (16 entries at this epoch)
Number of the epoch (0) and number of entries in the epoch.
2000::1/128, epoch 0, flags attached, connected, receive, local
Details about the prefix: the epoch in which it is found, the flags set for the prefix:
attached--Prefix is a connected network
connected--Prefix includes an address that is bound to an interface on the device
receive--Prefix is punt to and handled by the process level
local--Prefix is a subset of receive and marks prefixes that are received by on interface on the device
Examples
The following is sample output from the
showipv6cefwithsourceadjacency command:
Router# show ipv6 cef with source adjacency
2001::3/128
attached to Ethernet2/0
The table below describes the significant fields shown in the display.
Table 10 show ipv6 cef with source adjacency Field Descriptions
Field
Description
20001::3/128
IPv6 prefix whose source is an adjacency.
attached to Ethernet2/0
Indicates that the prefix is a connected network through Interface Ethernet 2/0.
The following is sample output from the
showipv6cefwithsourceadjacencydetailcommand:
Router# show ipv6 cef with source adjacency detail
#
IPv6 CEF is enabled and running centrally.
VRF Default
16 prefixes (16/0 fwd/non-fwd)
Table id 0x1E000000
Database epoch: 0 (16 entries at this epoch)
2001::3/128, epoch 0, flags attached
Adj source: IPV6 adj out of Ethernet2/0, addr 2001::3 050878F0
Dependent covered prefix type adjfib cover 2001::/64
attached to Ethernet2/0
The table below describes the significant fields shown in the display.
Table 11 show ipv6 cef with source adjacency detail Field Descriptions
Field
Description
IPv6 CEF is enabled and running centrally.
Verifies that Cisco Express Forwarding for IPV6 is enabled and running on the RP.
VRF Default
Default VRF table.
16 prefixes (16/0 Fwd/non-fwd)
Number of prefixes in the VRF, how many prefixes are forwarded and how many are not forwarded.
Table id 0x1E000000
Identifies the table by hexadecimal number.
2001::3/128, epoch 0, flags attached
Lists a prefix, its epoch number, and flags. Attached flag indicates a connected network.
Adj source: IPv6 adj out of Ethernet2/0, addr 2000::3 050878F0
Indicates that the prefix was sourced by an adjacency and specifies the address family, interface, and address in memory of the adjacency.
Dependent covered prefix type adjfib cover 2001::/64
A prefix sourced by an adjacency is dependent on another less specific prefix (2001::/64) for forwarding information. If this less specific prefix changes, the dependent prefix will need to be recomputed.
attached to Ethernet2/0
Indicates the prefix is a connect network through interface Ethernet 2/0.
The following is sample output from the
showipv6cefwithsourceadjacencychecksumcommand:
Router# show ipv6 cef with source adjacency checksum
2001::3/128
FIB checksum: 0x4AE0F5DC
The table below describes the significant fields shown in the display.
Table 12 show ipv6 cef with source adjacency checksum Field Descriptions
Field
Description
2001::3/128
IPv6 prefix whose source is an adjacency.
FIB checksum: 0x4AE0F5DC
FIB checksum.
Examples
The following is sample output from the
showipv6cefwithsourceadjacency command:
Router# show ipv6 cef with source adj
2001::3/128
attached to Ethernet2/0
The table below describes the significant fields shown in the display.
Table 13 show ipv6 cef with source adj Field Descriptions
Field
Description
20001::3/128
IPv6 prefix whose source is an adjacency.
attached to Ethernet2/0
Indicates that the prefix is a network connected through interface Ethernet 2/0.
The following is sample output from the
showipv6cefwithsourceadjdetailcommand:
Router# show ipv6 cef with source adj detail
IPv6 CEF is enabled and running centrally.
VRF base:
16 prefixes (16/0 fwd/non-fwd)
Table id 0
Database epoch: 0 (16 entries at this epoch)
2001::3/128, epoch 0, flags attached
Adj source: IPV6 adj out of Ethernet2/0, addr 2001::3 02513FD8
Dependent covered prefix type adjfib cover 2001::/64
attached to Ethernet2/0
The table below describes the significant fields shown in the display.
Table 14 show ipv6 cef with source adj detail Field Descriptions
Field
Description
IPv6 CEF is enabled and running centrally.
Verifies that Cisco Express Forwarding for IPV6 is enabled an running on the RP.
VRF base
Base VRF table.
16 prefixes (16/0 Fwd/non-fwd)
Number of prefixes, and how many prefixes are forwarded and how many are not forwarded.
2001::3/128, epoch 0, flags attached
Provides more detail about the adjacency source, such as epoch number and flags.
Adj source: IPv6 adj out of Ethernet2/0, addr 2000::3 050878F0
Lists a prefix, its epoch number, and flags. Attached flag indicates a connected network.
Dependent covered prefix type adjfib cover 2001::/64
A prefix sourced by an adjacency is dependent on another less specific prefix (2001::/64) for forwarding information. If this less specific prefix changes, the dependent prefix will need to be recomputed.
attached to Ethernet2/0
Indicates the prefix is a connect network through interface Ethernet 2/0.
The following is sample output from the
showipv6cefwithsourceadjchecksumcommand:
Router# show ipv6 cef with source adj checksum
2001::3/128
FIB checksum: 0x4AE0F5DC
The table below describes the significant fields shown in the display.
Table 15 show ipv6 cef with source adj checksum Field Descriptions
Field
Description
2001::3/128
IPv6 prefix whose source is an adjacency.
FIB checksum: 0x4AE0F5DC
FIB checksum.
Related Commands
Command
Description
showipcef
Displays entries in the FIB or displays a summary of the FIB.
showipcefwithepoch
Displays information about an epoch in the Cisco Express Forwarding FIB.
showipv6cefwithepoch
Displays information about an epoch in the Cisco Express Forwarding IPv6 FIB.
showipv6cefwithsource
Displays information about prefix sources in the Cisco Express Forwarding IPv6 FIB.
show ipv6 cga address-db
To display IPv6 cryptographically generated addresses (CGA) from the address database, use the
showipv6cgaaddress-db command in privileged EXEC mode.
showipv6cgaaddress-db
Syntax Description
This command has no arguments or keywords.
Command Default
No CGAs are displayed.
Command Modes
Privileged EXEC
Command History
Release
Modification
12.4(24)T
This command was introduced.
Examples
The following example displays CGAs in the CGA database:
Generates an IPv6 CGA modifier for a specified RSA key pair.
showipv6cgaaddress-db
Displays IPv6 CGAs.
show ipv6 nd secured certificates
Displays active SeND certificates.
show ipv6 nd secured counters interface
Displays SeND counters on an interface.
show ipv6 nd secured nonce-db
Displays active SeND nonce entries.
show ipv6 nd secured timestamp-db
Displays active SeND time-stamp entries.
show ipv6 destination-guard policy
To display destination guard information, use the
showipv6destination-guardpolicy command in privileged EXEC mode.
showipv6destination-guardpolicy [policy-name]
Syntax Description
policy-name
(Optional) Name of the destination guard policy.
Command Modes
Privileged EXEC (#)
Command History
Release
Modification
15.2(4)S
This command was introduced.
Usage Guidelines
If the
policy-name argument is specified, only the specified policy information is displayed. If the
policy-name argument is not specified, information is displayed for all policies.
Examples
The following is sample output from the
showipv6destination-guardpolicy command when the policy is applied to a VLAN:
To display the Dynamic Host Configuration Protocol (DHCP) unique identifier (DUID) on a specified device, use the showipv6dhcp command in user EXEC or privileged EXEC mode.
showipv6dhcp
Syntax Description
This command has no arguments or keywords.
Command Modes
User EXEC
Privileged EXEC
Command History
Release
Modification
12.3(4)T
This command was introduced.
Cisco IOS XE Release 2.1
This command was integrated into Cisco IOS XE Release 2.1.
12.2(33)SRE
This command was modified. It was integrated into Cisco IOS Release 12.2(33)SRE.
Usage Guidelines
The showipv6dhcp command uses the DUID based on the link-layer address for both client and server identifiers. The device uses the MAC address from the lowest-numbered interface to form the DUID. The network interface is assumed to be permanently attached to the device. Use theshowipv6dhcp command to display the DUID of a device.
Examples
The following is sample output from the showipv6dhcpcommand. The output is self-explanatory:
Router# show ipv6 dhcp
This device's DHCPv6 unique identifier(DUID): 000300010002FCA5DC1C
show ipv6 dhcp binding
To display automatic client bindings from the Dynamic Host Configuration Protocol (DHCP) for IPv6 server binding table, use the
showipv6dhcpbinding command in user EXEC or privileged EXEC mode.
(Optional) Specifies a virtual routing and forwarding (VRF) configuration.
Command Modes
User EXEC (>)
Privileged EXEC (#)
Command History
Release
Modification
12.3(4)T
This command was introduced.
12.4
This command was modified. Command output was updated to display a PPP username associated with a binding.
12.4(24)T
This command was modified. Command output was updated to display address bindings.
Cisco IOS XE Release 2.1
This command was integrated into Cisco IOS XE Release 2.1.
15.1(2)S
This command was modified. The
vrfvrf-name keyword and argument were added.
Cisco IOS XE Release 3.3S
This command was modified. The
vrfvrf-name keyword and argument were added.
Usage Guidelines
The
showipv6dhcpbinding command displays all automatic client bindings from the DHCP for IPv6 server binding table if the
ipv6-address argument is not specified. When the
ipv6-address argument is specified, only the binding for the specified client is displayed.
If the
vrfvrf-namekeyword and argument combination is specified, all bindings that belong to the specified VRF are displayed.
Examples
The following sample output displays all automatic client bindings from the DHCP for IPv6 server binding table:
Router# show ipv6 dhcp binding
Client: FE80::A8BB:CCFF:FE00:300
DUID: 00030001AABBCC000300
Username : client_1
Interface: Virtual-Access2.1
IA PD: IA ID 0x000C0001, T1 75, T2 135
Prefix: 2001:380:E00::/64
preferred lifetime 150, valid lifetime 300
expires at Dec 06 2007 12:57 PM (262 seconds)
Client: FE80::A8BB:CCFF:FE00:300 (Virtual-Access2.2)
DUID: 00030001AABBCC000300
IA PD: IA ID 0x000D0001, T1 75, T2 135
Prefix: 2001:0DB8:E00:1::/64
preferred lifetime 150, valid lifetime 300
expires at Dec 06 2007 12:58 PM (288 seconds)
The table below describes the significant fields shown in the display.
Table 18 show ipv6 dhcp binding Field Descriptions
Field
Description
Client
Address of a specified client.
DUID
DHCP unique identifier (DUID).
Virtual-Access2.1
First virtual client. When an IPv6 DHCP client requests two prefixes with the same DUID but a different identity association for prefix delegation (IAPD ) on two different interfaces, these prefixes are considered to be for two different clients, and interface information is maintained for both.
Username : client_1
The username associated with the binding.
IA PD
Collection of prefixes assigned to a client.
IA ID
Identifier for this IAPD.
Prefix
Prefixes delegated to the indicated IAPD on the specified client.
preferred lifetime, valid lifetime
The preferred lifetime and valid lifetime settings, in seconds, for the specified client.
Expires at
Date and time at which the valid lifetime expires.
Virtual-Access2.2
Second virtual client. When an IPv6 DHCP client requests two prefixes with the same DUID but different IAIDs on two different interfaces, these prefixes are considered to be for two different clients, and interface information is maintained for both.
When the DHCPv6 pool on the Cisco IOS DHCPv6 server is configured to obtain prefixes for delegation from an authentication, authorization, and accounting (AAA) server, it sends the PPP username from the incoming PPP session to the AAA server for obtaining the prefixes. The PPP username is associated with the binding is displayed in output from the
showipv6dhcpbinding command. If there is no PPP username associated with the binding, this field value is displayed as "unassigned."
The following example shows that the PPP username associated with the binding is "client_1":
Router# show ipv6 dhcp binding
Client: FE80::2AA:FF:FEBB:CC
DUID: 0003000100AA00BB00CC
Username : client_1
Interface : Virtual-Access2
IA PD: IA ID 0x00130001, T1 75, T2 135
Prefix: 2001:0DB8:1:3::/80
preferred lifetime 150, valid lifetime 300
expires at Aug 07 2008 05:19 AM (225 seconds)
The following example shows that the PPP username associated with the binding is unassigned:
Router# show ipv6 dhcp binding
Client: FE80::2AA:FF:FEBB:CC
DUID: 0003000100AA00BB00CC
Username : unassigned
Interface : Virtual-Access2
IA PD: IA ID 0x00130001, T1 150, T2 240
Prefix: 2001:0DB8:1:1::/80
preferred lifetime 300, valid lifetime 300
expires at Aug 11 2008 06:23 AM (233 seconds)
Related Commands
Command
Description
clearipv6dhcpbinding
Deletes automatic client bindings from the DHCP for IPv6 binding table.
show ipv6 dhcp conflict
To display address conflicts found by a Dynamic Host Configuration Protocol for IPv6 (DHCPv6) server when addresses are offered to the client, use the showipv6dhcpconflict command in privileged EXEC mode.
(Optional) Specifies a virtual routing and forwarding (VRF) configuration.
Command Modes
Privileged EXEC (#)
Command History
Release
Modification
12.4(24)T
This command was introduced.
Cisco IOS XE Release 2.5
This command was integrated into Cisco IOS XE Release 2.5.
15.1(2)S
This command was modified. The vrfvrf-name keyword and argument were added.
Cisco IOS XE Release 3.3S
This command was modified. The vrfvrf-name keyword and argument were added.
Cisco IOS XE Release 3.2SE
This command was integrated into Cisco IOS XE Release 3.2SE.
Usage Guidelines
When you configure the DHCPv6 server to detect conflicts, it uses ping. The client uses neighbor discovery to detect clients and reports to the server through a DECLINE message. If an address conflict is detected, the address is removed from the pool, and the address is not assigned until the administrator removes the address from the conflict list.
Examples
The following is a sample output from the showipv6dhcpconflict command. This command shows the pool and prefix values for DHCP conflicts.:
Router# show ipv6 dhcp conflict
Pool 350, prefix 2001:0DB8:1005::/48
2001:0DB8:1005::10
Related Commands
Command
Description
clear ipv6 dhcp conflict
Clears an address conflict from the DHCPv6 server database.
show ipv6 dhcp database
To display the Dynamic Host Configuration Protocol (DHCP) for IPv6 binding database agent information, use the
showipv6dhcpdatabase command in user EXEC or privileged EXEC mode.
showipv6dhcpdatabase [agent-URL]
Syntax Description
agent-URL
(Optional) A flash, NVRAM, FTP, TFTP, or remote copy protocol (RCP) uniform resource locator.
Command Modes
User EXEC
Privileged EXEC
Command History
Release
Modification
12.3(4)T
This command was introduced.
Cisco IOS XE Release 2.1
This command was integrated into Cisco IOS XE Release 2.1.
Usage Guidelines
Each permanent storage to which the binding database is saved is called the database agent. An agent can be configured using the
ipv6dhcpdatabase command. Supported database agents include FTP and TFTP servers, RCP, Flash file system, and NVRAM.
The
showipv6dhcpdatabasecommand displays DHCP for IPv6 binding database agent information. If the
agent-URL argument is specified, only the specified agent is displayed. If the
agent-URL argument is not specified, all database agents are shown.
Examples
The following is sample output from the
showipv6dhcpdatabasecommand:
Router# show ipv6 dhcp database
Database agent tftp://172.19.216.133/db.tftp:
write delay: 69 seconds, transfer timeout: 300 seconds
last written at Jan 09 2003 01:54 PM,
write timer expires in 56 seconds
last read at Jan 06 2003 05:41 PM
successful read times 1
failed read times 0
successful write times 3172
failed write times 2
Database agent nvram:/dhcpv6-binding:
write delay: 60 seconds, transfer timeout: 300 seconds
last written at Jan 09 2003 01:54 PM,
write timer expires in 37 seconds
last read at never
successful read times 0
failed read times 0
successful write times 3325
failed write times 0
Database agent flash:/dhcpv6-db:
write delay: 82 seconds, transfer timeout: 3 seconds
last written at Jan 09 2003 01:54 PM,
write timer expires in 50 seconds
last read at never
successful read times 0
failed read times 0
successful write times 2220
failed write times 614
The table below describes the significant fields shown in the display.
Table 19 show ipv6 dhcp database Field Descriptions
Field
Description
Database agent
Specifies the database agent.
Write delay
The amount of time (in seconds) to wait before updating the database.
transfer timeout
Specifies how long (in seconds) the DHCP server should wait before aborting a database transfer. Transfers that exceed the timeout period are aborted.
Last written
The last date and time bindings were written to the file server.
Write timer expires...
The length of time, in seconds, before the write timer expires.
Last read
The last date and time bindings were read from the file server.
Successful/failed read times
The number of successful or failed read times.
Successful/failed write times
The number of successful or failed write times.
Related Commands
Command
Description
ipv6dhcpdatabase
Specifies DHCP for IPv6 binding database agent parameters.
show ipv6 dhcp guard policy
To display Dynamic Host Configuration Protocol for IPv6 (DHCPv6) guard information, use the
showipv6dhcpguardpolicy command in privileged EXEC mode.
showipv6dhcpguardpolicy [policy-name]
Syntax Description
policy-name
(Optional) DHCPv6 guard policy name.
Command Modes
Privileged EXEC (#)
Command History
Release
Modification
15.2(4)S
This command was introduced.
Usage Guidelines
If the
policy-name argument is specified, only the specified policy information is displayed. If the
policy-name argument is not specified, information is displayed for all policies.
Examples
The following is sample output from the
showipv6dhcpguardguard command:
The table below describes the significant fields shown in the display.
Table 20 show ipv6 dhcp guard Field Descriptions
Field
Description
Device Role
The role of the device. The role is either client, server or relay.
Target
The name of the target. The target is either an interface or a VLAN.
Related Commands
Command
Description
ipv6dhcpguardpolicy
Defines the DHCPv6 guard policy name.
show ipv6 dhcp interface
To display Dynamic Host Configuration Protocol (DHCP) for IPv6 interface information, use the
showipv6dhcpinterface command in user EXEC or privileged EXEC mode.
showipv6dhcpinterface
[ typenumber ]
Syntax Description
typenumber
(Optional) Interface type and number. For more information, use the question mark (?) online help function.
Command Modes
User EXEC
Privileged EXEC
Command History
Release
Modification
12.3(4)T
This command was introduced.
12.3(11)T
Command output was modified to allow relay agent information to be displayed on a specified interface if the relay agent feature is configured on that interface.
12.4(24)T
Command output was updated to display interface address assignments and T1 and T2 renew/rebind times.
Cisco IOS XE Release 2.1
This command was integrated into Cisco IOS XE Release 2.1.
12.2(33)SRE
This command was modified. It was integrated into Cisco IOS Release 12.2(33)SRE.
12.2(33)XNE
This command was modified. It was integrated into Cisco IOS Release 12.2(33)XNE.
Usage Guidelines
If no interfaces are specified, all interfaces on which DHCP for IPv6 (client or server) is enabled are shown. If an interface is specified, only information about the specified interface is displayed.
Examples
The following is sample output from the
showipv6dhcpinterfacecommand. In the first example, the command is used on a router that has an interface acting as a DHCP for IPv6 server. In the second example, the command is used on a router that has an interface acting as a DHCP for IPv6 client:
Router1# show ipv6 dhcp interface
Ethernet2/1 is in server mode
Using pool: svr-p1
Preference value: 20
Rapid-Commit is disabled
Router2# show ipv6 dhcp interface
Ethernet2/1 is in client mode
State is OPEN (1)
List of known servers:
Address: FE80::202:FCFF:FEA1:7439, DUID 000300010002FCA17400
Preference: 20
IA PD: IA ID 0x00040001, T1 120, T2 192
Prefix: 3FFE:C00:C18:1::/72
preferred lifetime 240, valid lifetime 54321
expires at Nov 08 2002 09:10 AM (54319 seconds)
Prefix: 3FFE:C00:C18:2::/72
preferred lifetime 300, valid lifetime 54333
expires at Nov 08 2002 09:11 AM (54331 seconds)
Prefix: 3FFE:C00:C18:3::/72
preferred lifetime 280, valid lifetime 51111
expires at Nov 08 2002 08:17 AM (51109 seconds)
DNS server: 1001::1
DNS server: 1001::2
Domain name: domain1.net
Domain name: domain2.net
Domain name: domain3.net
Prefix name is cli-p1
Rapid-Commit is enabled
The table below describes the significant fields shown in the display.
Table 21 show ipv6 dhcp interface Field Descriptions
Field
Description
Ethernet2/1 is in server/client mode
Displays whether the specified interface is in server or client mode.
Preference value:
The advertised (or default of 0) preference value for the indicated server.
Prefix name is cli-p1
Displays the IPv6 general prefix pool name, in which prefixes successfully acquired on this interface are stored.
Using pool: svr-p1
The name of the pool that is being used by the interface.
State is OPEN
State of the DHCP for IPv6 client on this interface. "Open" indicates that configuration information has been received.
List of known servers
Lists the servers on the interface.
Address, DUID
Address and DHCP unique identifier (DUID) of a server heard on the specified interface.
Rapid commit is disabled
Displays whether the
rapid-commit keyword has been enabled on the interface.
The following example shows the DHCP for IPv6 relay agent configuration on FastEthernet interface 0/0, and use of the
showipv6dhcpinterface command displays relay agent information on FastEthernet interface 0/0:
Router(config-if)# ipv6 dhcp relay destination FE80::250:A2FF:FEBF:A056 FastEthernet0/1
Router# show ipv6 dhcp interface FastEthernet 0/0
FastEthernet0/0 is in relay mode
Relay destinations:
FE80::250:A2FF:FEBF:A056 via FastEthernet0/1
Related Commands
Command
Description
ipv6dhcpclientpd
Enables the DHCP for IPv6 client process and enables requests for prefix delegation through a specified interface.
ipv6dhcprelaydestination
Specifies a destination address to which client messages are forwarded and enables DHCP for IPv6 relay service on the interface.
ipv6dhcpserver
Enables DHCP for IPv6 service on an interface.
show ipv6 dhcp pool
To display Dynamic Host Configuration Protocol (DHCP) for IPv6 configuration pool information, use the
showipv6dhcppool command in user EXEC or privileged EXEC mode.
showipv6dhcppool [poolname]
Syntax Description
poolname
(Optional) User-defined name for the local prefix pool. The pool name can be a symbolic string (such as "Engineering") or an integer (such as 0).
Command Modes
User EXEC
Privileged EXEC
Command History
Release
Modification
12.3(4)T
This command was introduced.
12.4(24)T
Command output was updated to display address pools and prefix pools.
Cisco IOS XE Release 2.1
This command was integrated into Cisco IOS XE Release 2.1.
12.2(33)SRE
This command was modified. It was integrated into Cisco IOS Release 12.2(33)SRE.
12.2(33)XNE
This command was modified. It was integrated into Cisco IOS Release 12.2(33)XNE.
Usage Guidelines
Use the
ipv6dhcppool command to create a configuration pool, and use the
ipv6dhcpserver command to associate the configuration pool with a server on an interface.
The
showipv6dhcppool command displays DHCP for IPv6 configuration pool information. If the
poolname argument is specified, only information on the specified pool is displayed. If the
poolname argument is not specified, information about all pools is shown.
Examples
The following sample output displays DHCP for IPv6 configuration pool information:
Router# show ipv6 dhcp pool
DHCPv6 pool: svr-p1
Static bindings:
Binding for client 000300010002FCA5C01C
IA PD: IA ID 00040002,
Prefix: 3FFE:C00:C18:3::/72
preferred lifetime 604800, valid lifetime 2592000
IA PD: IA ID not specified; being used by 00040001
Prefix: 3FFE:C00:C18:1::/72
preferred lifetime 240, valid lifetime 54321
Prefix: 3FFE:C00:C18:2::/72
preferred lifetime 300, valid lifetime 54333
Prefix: 3FFE:C00:C18:3::/72
preferred lifetime 280, valid lifetime 51111
Prefix from pool: local-p1, Valid lifetime 12345, Preferred lifetime 180
DNS server: 1001::1
DNS server: 1001::2
Domain name: example1.net
Domain name: example2.net
Domain name: example3.net
Active clients: 2
The table below describes the significant fields shown in the display.
Table 22 show ipv6 dhcp pool Field Descriptions
Field
Description
DHCPv6 pool: svr-p1
The name of the pool.
IA PD
Identity association for prefix delegation (IAPD), which is a collection of prefixes assigned to a client.
IA ID
Identifier for this IAPD.
Prefix
Prefixes to be delegated to the indicated IAPD on the specified client.
preferred lifetime, valid lifetime
Lifetimes, in seconds, associated with the prefix statically assigned to the specified client.
DNS server
IPv6 addresses of the DNS servers.
Domain name
Displays the DNS domain search list.
Active clients
Total number of active clients.
Related Commands
Command
Description
ipv6dhcppool
Configures a DHCP for IPv6 configuration information pool and enters DHCP for IPv6 pool configuration mode.
ipv6dhcpserver
Enables DHCP for IPv6 service on an interface.
show ipv6 dhcp relay binding
To display DHCPv6 Internet Assigned Numbers Authority (IANA) and DHCPv6 Identity Association for Prefix Delegation (IAPD) bindings on a relay agent, use the
showipv6dhcprelaybinding command in user EXEC or privileged EXEC mode.
showipv6dhcprelaybinding
[ vrfvrf-name ]
Syntax Description
vrfvrf-name
(Optional) Specifies a virtual routing and forwarding (VRF) configuration.
Command Modes
User EXEC (>)
Privileged EXEC (#)
Command History
Release
Modification
15.1(2)S
This command was introduced.
Cisco IOS XE Release 3.3S
This command was integrated into Cisco IOS XE Release 3.3S.
15.2(1)S
This command was modified. In addition to DHCPv6 IAPD bindings, DHCPv6 IANA bindings on a relay agent can be displayed.
Cisco IOS XE Release 3.5S
This command was modified. In addition to DHCPv6 IAPD bindings, DHCPv6 IANA bindings on a relay agent can be displayed.
12.2(33)SCF4
This command was implemented on Cisco uBR10012 and Cisco uBR7200 series universal broadband devices.
15.3(3)M
This command was integrated into Cisco IOS Release 15.3(3)M.
Usage Guidelines
If the
vrfvrf-name keyword-argument pair is specified, all bindings belonging to the specified VRF are displayed.
Note
Only the DHCPv6 IAPD bindings on a relay agent are displayed on the Cisco uBR10012 and Cisco uBR7200 series universal broadband devices.
Examples
The following is sample output from the
showipv6dhcprelaybinding command:
Device# show ipv6 dhcp relay binding
The following example shows output from the
show ipv6 dhcp relay binding command with a specified VRF name on a Cisco uBR10012 universal broadband device:
The table below describes the significant fields shown in the display.
Table 23 show ipv6 dhcp relay binding Field Descriptions
Field
Description
Prefix
IPv6 prefix for DHCP.
DUID
DHCP Unique Identifier (DUID) for the IPv6 relay binding.
IAID
Identity Association Identification (IAID) for DHCP.
lifetime
Lifetime of the prefix, in seconds.
Related Commands
Command
Description
clear
ipv6
dhcp
relaybinding
Clears a specific IPv6 address or IPv6 prefix of a DHCP for IPv6 relay binding.
show ipv6 eigrp events
To display Enhanced Interior Gateway Routing Protocol (EIGRP) events logged for IPv6, use the showipv6eigrpevents command in user EXEC or privileged EXEC mode.
showipv6eigrpevents
[ [ errmsg | sia ]
[ event-num-startevent-num-end ] | type ]
Syntax Description
errmsg
(Optional) Displays error messages being logged.
sia
(Optional) Displays Stuck In Active (SIA) messages.
event-num-start
(Optional) Starting number of the event range. The range is from 1 to 4294967295.
event-num-end
(Optional) Ending number of the event range. The range is from 1 to 4294967295.
type
(Optional) Displays event types being logged.
Command Default
If no event range is specified, information for all IPv6 EIGRP events is displayed.
Command Modes
User EXEC (>)
Privileged EXEC (#)
Command History
Release
Modification
15.0(1)M
This command was introduced in a release earlier than Cisco IOS Release 15.0(1) on the Cisco 3845 series routers.
Usage Guidelines
The showipv6eigrpeventscommand is used to analyze a network failure by the Cisco support team and is not intended for general use. This command provides internal state information about EIGRP and how it processes route notifications and changes.
Examples
The following is sample output from the showipv6eigrpevents command. The fields are self-explanatory.
Deletes entries from EIGRP for IPv6 routing tables.
debugipv6eigrp
Displays information about EIGRP for IPv6 protocol.
ipv6eigrp
Enables EIGRP for IPv6 on a specified interface.
show ipv6 eigrp interfaces
To display information about interfaces configured for the Enhanced Interior Gateway Routing Protocol (EIGRP) in IPv6 topologies, use the
showipv6eigrpinterfaces command in user EXEC or privileged EXEC mode.
(Optional) Interface type. For more information, use the question mark (?) online help function.
number
(Optional) Interface number. For more information about the numbering syntax for your networking device, use the question mark (?) online help function.
This command was integrated into Cisco IOS Release 12.2(33)SRB.
12.2(33)SXH
This command was integrated into Cisco IOS Release 12.2(33)SXH.
Cisco IOS XE Release 2.1
This command was implemented on Cisco ASR 1000 Series Aggregation Services Routers.
15.2(1)S
This command was integrated into Cisco IOS Release 15.2(1)S. Information about the Equal Cost Multipath (ECMP) mode was included in the command output.
Cisco IOS XE Release 3.5S
This command was modified. Information about the ECMP mode was included in the command output.
15.2(3)T
This command was modified. Information about the ECMP mode was included in the command output.
Usage Guidelines
Use the
showipv6eigrpinterfaces command to determine the interfaces on which EIGRP is active and to get information about EIGRP processes related to those interfaces. The optional type number argument and the
detail keyword can be entered in any order.
If an interface is specified, only that interface is displayed. Otherwise, all interfaces on which EIGRP is running are displayed.
If an autonomous system is specified, only the routing process for the specified autonomous system is displayed. Otherwise, all EIGRP processes are displayed.
Examples
The following is sample output from the
showipv6eigrpinterfaces command:
Device# show ipv6 eigrp 1 interfaces
IPv6-EIGRP interfaces for process 1
Xmit Queue Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes
Et0/0 0 0/0 0 0/10 0 0
The following is sample output from the
showipv6eigrpinterfaces detail command:
Device# show ipv6 eigrp interfaces detail
IPv6-EIGRP interfaces for process 1
Xmit Queue Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes
Et0/0 0 0/0 0 0/10 0 0
Hello interval is 5 sec
Next xmit serial <none>
Un/reliable mcasts: 0/0 Un/reliable ucasts: 0/0
Mcast exceptions: 0 CR packets: 0 ACKs suppressed: 0
Retransmissions sent: 0 Out-of-sequence rcvd: 0
Authentication mode is not set
The following sample output from the
show ipv6 eigrp interface detail command displays detailed information about a specific interface on which the
no ipv6 next-hop self
command is configured with the
no-ecmp-mode option:
Device# show ipv6 eigrp interfaces detail tunnel 0
EIGRP-IPv6 Interfaces for AS(1)
Xmit Queue PeerQ Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable Un/Reliable SRTT Un/Reliable Flow Timer Routes
Tu0/0 2 0/0 0/0 29 0/0 136 0
Hello-interval is 5, Hold-time is 15
Split-horizon is disabled
Next xmit serial <none>
Packetized sent/expedited: 48/1
Hello's sent/expedited: 13119/49
Un/reliable mcasts: 0/20 Un/reliable ucasts: 31/398
Mcast exceptions: 5 CR packets: 5 ACKs suppressed: 1
Retransmissions sent: 355 Out-of-sequence rcvd: 6
Next-hop-self disabled, next-hop info forwarded, ECMP mode Enabled
Topology-ids on interface - 0
Authentication mode is not set
The table below describes the significant fields shown in the displays.
Table 24 show ipv6 eigrp interfaces Field Descriptions
Field
Description
Interface
Interface over which EIGRP is configured.
Peers
Number of directly connected EIGRP neighbors.
Xmit Queue Un/Reliable
Number of packets remaining in the Unreliable and Reliable transmit queues.
Mean SRTT
Mean smooth round-trip time (SRTT) interval (in seconds).
Pacing Time Un/Reliable
Pacing time (in seconds) used to determine when EIGRP packets (unreliable and reliable) should be sent out of the interface.
Multicast Flow Timer
Maximum number of seconds in which the device will send multicast EIGRP packets.
Pending Routes
Number of routes in the transmit queue waiting to be sent.
Hello interval is 5 sec
Length (in seconds) of the hello interval.
show ipv6 eigrp neighbors
To display the neighbors discovered by Enhanced Interior Gateway Routing Protocol (EIGRP) for IPv6, use the
showipv6eigrpneighbors command in user EXEC or privileged EXEC mode.
This command was integrated into Cisco IOS Release 12.2(33)SRB.
12.2(33)SXH
This command was integrated into Cisco IOS Release 12.2(33)SXH.
Cisco IOS XE Release 2.1
This command was introduced on Cisco ASR 1000 Series Routers.
Usage Guidelines
Use the
showipv6eigrpneighbors command to determine when neighbors become active and inactive. It is also useful for debugging certain types of transport problems.
Examples
The following is sample output from the
showipv6eigrpneighborscommand:
Router# show ipv6 eigrp neighbors
IPv6-EIGRP neighbors for process 1
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 Link-local address: Et0/0 14 00:00:13 11 200 0 2
FE80::A8BB:CCFF:FE00:200
The table below describes the significant fields shown in the display.
Table 25 show ipv6 eigrp neighbors Field Descriptions
Field
Description
process 1
Autonomous system number.
Address FE80::A8BB:CCFF:FE00:200
IPv6 address of the EIGRP peer.
Interface
Interface on which the router is receiving hello packets from the peer.
Hold
Length of time (in seconds) that the Cisco IOS software will wait to hear from the peer before declaring it down. If the peer is using the default hold time, this number will be less than 15. If the peer configures a nondefault hold time, the nondefault hold time will be displayed.
Uptime
Elapsed time (in hours:minutes:seconds) since the local router first heard from this neighbor.
SRTT (ms)
Smoothed round-trip time (SRTT). The number of milliseconds required for an EIGRP packet to be sent to this neighbor and for the local router to receive an acknowledgment of that packet.
RTO
Retransmission timeout (in milliseconds). This is the amount of time the software waits before resending a packet from the retransmission queue to a neighbor.
Q count
Number of EIGRP packets (update, query, and reply) that the software is waiting to send.
Seq Num
Sequence number of the last update, query, or reply packet that was received from this neighbor.
The following is sample output from the
showipv6eigrpneighborscommand with the
detail keyword:
Router# show ipv6 eigrp neighbors detail
IPv6-EIGRP neighbors for process 1
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 Link-local address: Et0/0 11 00:00:30 11 200 0 2
FE80::A8BB:CCFF:FE00:200
Version 12.4/1.2, Retrans: 0, Retries: 0
The table below describes the significant fields shown in the display.
Table 26 show ipv6 eigrp neighbors detail Field Descriptions
Field
Description
H
This column lists the order in which a peering session was established with the specified neighbor. The order is specified with sequential numbering starting with 0.
Version
The software version that the specified peer is running.
Retrans
The number of times that a packet has been retransmitted.
Retries
The number of times an attempt was made to retransmit a packet.
The following is sample output from the
showipv6eigrpneighborscommand with the
statickeyword:
Router# show ipv6 eigrp neighbors static
IPv6-EIGRP neighbors for process 1
Static Address Interface
Link-local address: Ethernet0/0
FE80::A8BB:CCFF:FE00:200
show ipv6 eigrp topology
To display Enhanced Interior Gateway Routing Protocol (EIGRP) IPv6 topology table entries, use the
showipv6eigrptopology command in user EXEC or privileged EXEC mode.
(Optional) Displays only active entries in the EIGRP topology table.
all-links
(Optional) Displays all entries in the EIGRP topology table (including nonfeasible-successor sources).
pending
(Optional) Displays all entries in the EIGRP topology table that are either waiting for an update from a neighbor or waiting to reply to a neighbor.
summary
(Optional) Displays a summary of the EIGRP topology table.
zero-successors
(Optional) Displays the available routes that have zero successors.
Command Modes
User EXEC (>)
Privileged EXEC (#)
Command History
Release
Modification
12.4(6)T
This command was introduced.
12.2(33)SRB
This command was integrated into Cisco IOS Release 12.2(33)SRB.
12.2(33)SXH
This command was integrated into Cisco IOS Release 12.2(33)SXH.
15.2(1)S
This command was integrated into Cisco IOS Release 15.2(1)S. Information about the Equal Cost Multipath (ECMP) mode was included in the command output.
Cisco IOS XE Release 3.5S
This command was integrated into Cisco IOS XE Release 3.5S.
15.2(2)S
This command was modified. The output of the command was enhanced to display route tag values in dotted-decimal format.
Cisco IOS XE Release 3.6S
This command was modified. The output of the command was enhanced to display route tag values in dotted-decimal format.
15.2(3)T
This command was modified. Information about the Equal Cost Multipath (ECMP) mode was included in the command output.
Usage Guidelines
If this command is used without any keywords or arguments, only routes that are feasible successors are displayed. The
showipv6eigrptopology command can be used to determine Diffusing Update Algorithm (DUAL) states and to debug possible DUAL problems.
Examples
The following is sample output from the
showipv6eigrptopology command. The fields in the display are self-explanatory.
Device# show ipv6 eigrp topology
IPv6-EIGRP Topology Table for AS(1)/ID(2001:0DB8:10::/64)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 2001:0DB8:3::/64, 1 successors, FD is 281600
via Connected, Ethernet1/0
The following sample output from the
show ipv6 eigrp topologyprefix command displays ECMP mode information when the
no ipv6 next-hop-self command is configured without the
no-ecmp-mode option in the EIGRP topology. The ECMP mode provides information about the path that is being advertised. If there is more than one successor, the top most path will be advertised as the default path over all interfaces, and the message “ECMP Mode: Advertise by default” will be displayed in the output. If any path other than the default path is advertised, the message “ECMP Mode: Advertise out <Interface name>” will be displayed. The fields in the display are self-explanatory.
Device# show ipv6 eigrp topology 2001:DB8:10::1/128
EIGRP-IPv6 Topology Entry for AS(1)/ID(192.0.2.100) for 2001:DB8:10::1/128
State is Passive, Query origin flag is 1, 2 Successor(s), FD is 284160
Descriptor Blocks:
FE80::A8BB:CCFF:FE01:2E01 (Tunnel0), from FE80::A8BB:CCFF:FE01:2E01, Send flag is 0x0
Composite metric is (284160/281600), route is Internal
Vector metric:
Minimum bandwidth is 10000 Kbit
Total delay is 1100 microseconds
Reliability is 255/255
Load is ½55
Minimum MTU is 1400
Hop count is 1
Originating router is 10.10.1.1
ECMP Mode: Advertise by default
FE80::A8BB:CCFF:FE01:3E01 (Tunnel1), from FE80::A8BB:CCFF:FE01:3E01, Send flag is 0x0
Composite metric is (284160/281600), route is Internal
Vector metric:
Minimum bandwidth is 10000 Kbit
Total delay is 1100 microseconds
Reliability is 255/255
Load is ½55
Minimum MTU is 1400
Hop count is 1
Originating router is 10.10.2.2
ECMP Mode: Advertise out Tunnel1
Related Commands
Command
Description
show eigrp address-family topology
Displays entries in the EIGRP topology table.
show ipv6 eigrp traffic
To display the number of Enhanced Interior Gateway Routing Protocol (EIGRP) for IPv6 packets sent and received, use the
showipv6eigrptraffic command in user EXEC or privileged EXEC mode.
showipv6eigrptraffic [as-number]
Syntax Description
as-number
(Optional) Autonomous system number.
Command Modes
User EXEC
Privileged EXEC
Command History
Release
Modification
12.4(6)T
This command was introduced.
12.2(33)SRB
This command was integrated into Cisco IOS Release 12.2(33)SRB.
12.2(33)SXH
This command was integrated into Cisco IOS Release 12.2(33)SXH.
Usage Guidelines
Use the
showipv6eigrptrafficcommand to provide information on packets received and sent.
Examples
The following is sample output from the
showipv6eigrptraffic command:
Router# show ipv6 eigrp traffic
IPv6-EIGRP Traffic Statistics for process 9
Hellos sent/received: 218/205
Updates sent/received: 7/23
Queries sent/received: 2/0
Replies sent/received: 0/2
Acks sent/received: 21/14
The table below describes the significant fields shown in the display.
Table 27 show ipv6 eigrp traffic Field Descriptions
Field
Description
process 9
Autonomous system number specified in the
ipv6routereigrpcommand.
Hellos sent/received
Number of hello packets sent and received.
Updates sent/received
Number of update packets sent and received.
Queries sent/received
Number of query packets sent and received.
Replies sent/received
Number of reply packets sent and received.
Acks sent/received
Number of acknowledgment packets sent and received.
Related Commands
Command
Description
ipv6routereigrp
Configures the EIGRP for IPv6 routing process.
show ipv6 flow cache aggregation
To display the aggregation cache configuration, use the show ipv6 cache flow aggregation command in privileged EXEC mode.
Displays the configuration of a particular aggregation cache as follows:
Autonomous system
Destination prefix
Prefix
Protocol-port
Source prefix
verbose
(Optional) Displays additional information from the aggregation cache.
Command Default
No default behavior or values.
Command Modes
Privileged EXEC
Command History
Release
Modification
12.3(7)T
This command was introduced.
12.2(30)S
This command was integrated into Cisco IOS Release 12.2(30)S.
12.2(33)SRA
This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(33)SXH
This command was integrated into Cisco IOS Release 12.2(33)SXH.
Examples
The following is an example display of an autonomous system aggregation cache using the show iv6 flow cache aggregation as command:
Router# show ipv6 flow cache aggregation as
IPv6 Flow Switching Cache, 278544 bytes
2 active, 4094 inactive, 13 added
178 ager polls, 0 flow alloc failures
Src If Src AS Dst If Dst AS Flows Pkts B/Pk Active
Fa1/0 0 Null 0 1 2 49 10.2
Fa1/0 0 Se2/0 20 1 5 100 0.0
The following is a sample display of an autonomous system aggregation cache for the prefix mask 2001::FFFC/64 using the show ipv6 flow cache aggregation as command:
Router# show ipv6 flow cache aggregation as
IPv6 Flow Switching Cache, 278544 bytes
2 active, 4094 inactive, 13 added
178 ager polls, 0 flow alloc failures
Src If Src AS Dst If Dst AS Flows Pkts B/Pk Active
e1/2 0 Null 0 1 2 49 10.2
e1/2 0 e1/2 20 1 5 100 0.0
The following is a sample display of an autonomous system aggregation cache for Ethernet1/2 using the show ipv6 flow cache verbose aggregation as command:
Router# show ipv6 flow cache aggregation as verbose
IPv6 Flow Switching Cache, 278544 bytes
2 active, 4094 inactive, 13 added
178 ager polls, 0 flow alloc failures
Src If Src AS Dst If Dst AS Flows Pkts B/Pk Active
e1/2 0 Null 0 1 2 49 10.2
e1/2 0 e1/2 20 1 5 100 0.0
The table below describes the significant fields shown in these examples.
Table 28 show ipv6 flow cache aggregation Field Descriptions
Field
Description
bytes
Number of bytes of memory used by the NetFlow cache.
active
Number of active flows in the NetFlow cache at the time this command was entered.
inactive
Number of flow buffers that are allocated in the NetFlow cache, but are not currently assigned to a specific flow at the time this command is entered.
added
Number of flows created since the start of the summary period.
ager polls
Number of times the NetFlow code looked at the cache to cause entries to expire (used by Cisco for diagnostics only).
flow alloc failures
Number of times the NetFlow code tried to allocate a flow but could not.
Src If
Specifies the source interface.
Src AS
Specifies the source autonomous system.
Dst If
Specifies the destination interface.
Dst AS
Specifies the destination autonomous system.
Flows
Number of flows.
Pkts
Number of packets.
B/Pk
Average number of bytes observed for the packets seen for this protocol (total bytes for this protocol or the total number of flows for this protocol for this summary period).
Active
Number of active flows in the NetFlow cache at the time this command was entered.
Related Commands
Command
Description
ipv6flow-aggregationcache
Enables aggregation cache configuration mode.
show ipv6 flow export
To display the statistics for the data export, including the main cache and all other enabled caches, use the showipv6 flow export command in user EXEC or privileged EXEC mode.
showipv6flowexport [template]
Syntax Description
template
(Optional) Displays export template statistics.
Command Modes
User EXEC
Privileged EXEC
Command History
Release
Modification
12.3(7)T
This command was introduced.
12.2(30)S
This command was integrated into Cisco IOS Release 12.2(30)S.
12.2(33)SRA
This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(33)SXH
This command was integrated into Cisco IOS Release 12.2(33)SXH.
Examples
The following is sample output from the
showipv6flowexport command:
Router# show ipv6 flow export
Flow export is enabled
Exporting flows to 10.42.42.1 (9991) 10.0.101.254 (9991)
Exporting using source IP address 10.0.101.203
Version 5 flow records
Export Stats for 10.42.42.1 (9991)
3 flows exported in 3 udp datagrams
0 flows failed due to lack of export packet
3 export packets were sent up to process level
0 export packets were dropped due to no fib
0 export packets were dropped due to adjacency issues
0 export packets were dropped enqueuing for the RP
0 export packets were dropped due to IPC rate limiting
Export Stats for 10.0.101.254 (9991)
7 flows exported in 7 udp datagrams
0 flows failed due to lack of export packet
6 export packets were sent up to process level
0 export packets were dropped due to no fib
0 export packets were dropped due to adjacency issues
0 export packets were dropped enqueuing for the RP
0 export packets were dropped due to IPC rate limiting
The table below describes the significant fields shown in the display.
Table 29 show ipv6 flow export Field Descriptions
Field
Description
Exporting flows to 10.42.42.1 (9991) 10.0.101.254 (9991)
Specifies the export destinations and ports. The ports are in parentheses.
Exporting using source IP address 10.0.101.203
Specifies the source address or interface.
Version 5 flow records
Specifies the version of the flow.
3 flows exported in 3udp datagrams
The total number of export packets sent, and the total number of flows contained within them.
0 flows failed due to lack of export packet
No memory was available to create an export packet.
0 export packets were sent up to process level
The packet could not be processed by CEF or by fast switching, possibly because another feature requires running on the packet.
0 export packets were dropped due to no fib
0 export packets were dropped due to adjacency issues
Indicates that CEF was unable to switch the packet or forward it up to the process level.
0 export packets were dropped enqueuing for the RP
0 export packets were dropped due to IPC rate limiting
Indicates that there was a problem transferring the export packet between the RP and the line card.
show ipv6 general-prefix
To display information on IPv6 general prefixes, use the
showipv6general-prefix command in user EXEC or privileged EXEC mode.
showipv6general-prefix
Syntax Description
This command has no arguments or keywords.
Command Modes
User EXEC
Privileged EXEC
Command History
Release
Modification
12.3(4)T
This command was introduced.
Usage Guidelines
Use the
showipv6general-prefix command to view information on IPv6 general prefixes.
Examples
The following example shows an IPv6 general prefix called my-prefix, which has been defined based on a 6to4 interface. The general prefix is also being used to define an address on interface loopback42.
Router# show ipv6 general-prefix
IPv6 Prefix my-prefix, acquired via 6to4
2002:B0B:B0B::/48
Loopback42 (Address command)
The table below describes the significant fields shown in the display.
Table 30 show ipv6 general-prefix Field Descriptions
Field
Description
IPv6 Prefix
User-defined name of the IPv6 general prefix.
Acquired via
The general prefix has been defined based on a 6to4 interface. A general prefix can also be defined manually or acquired using DHCP for IPv6 prefix delegation.
2002:B0B:B0B::/48
The prefix value for this general prefix.
Loopback42 (Address command)
List of interfaces where this general prefix is used.
Related Commands
Command
Description
ipv6general-prefix
Defines a general prefix for an IPv6 address manually.
show ipv6 inspect
To view Context-based Access Control (CBAC) configuration and session information, use the show ipv6 inspect command in privileged EXEC mode.
Displays the configured inspection rule with the name inspection-name.
config
Displays the complete Cisco IOS firewall inspection configuration.
interfaces
Displays interface configuration with respect to applied inspection rules and access lists.
session[detail
Displays existing sessions that are currently being tracked and inspected by Cisco IOS firewall. The optional detail keyword causes additional details about these sessions to be shown.
all
Displays all Cisco IOS firewall configuration and all existing sessions that are currently being tracked and inspected by Cisco IOS firewall.
Command Modes
Privileged EXEC
Command History
Release
Modification
12.3(7)T
This command was introduced.
Examples
The following example asks for information about interfaces currently under inspection:
Router# show ipv6 inspectinterfaces
Related Commands
Command
Description
ipv6inspect
Applies a set of inspection rules to an interface.
show ipv6 interface
To display the usability status of interfaces configured for IPv6, use the
showipv6interfacecommand in user EXEC or privileged EXEC mode.
showipv6interface [brief]
[ typenumber ]
[prefix]
Syntax Description
brief
(Optional) Displays a brief summary of IPv6 status and configuration for each interface.
type
(Optional) The interface type about which to display information.
number
(Optional) The interface number about which to display information.
prefix
(Optional) Prefix generated from a local IPv6 prefix pool.
Command Default
All IPv6 interfaces are displayed.
Command Modes
User EXEC
Privileged EXEC
Command History
Release
Modification
12.2(2)T
This command was introduced.
12.2(4)T
The OK, TENTATIVE, DUPLICATE, ICMP redirects, and ND DAD fields were added to the command output.
12.0(21)ST
This command was integrated into Cisco IOS Release 12.0(21)ST.
12.0(22)S
This command was integrated into Cisco IOS Release 12.0(22)S.
12.2(14)S
This command was integrated into Cisco IOS Release 12.2(14)S.
12.2(25)S
Command output was updated to display information on the current Unicast RPF configuration.
12.4(2)T
Command output was updated to show the state of the default router preference (DRP) preference value as advertised by a device through an interface.
12.2(28)SB
This command was integrated into Cisco IOS Release 12.2(28)SB.
12.2(25)SG
This command was integrated into Cisco IOS Release 12.2(25)SG.
12.4(4)T
Command output was updated to show Hot Standby Router Protocol (HSRP) for IPv6 information.
12.2(33)SRA
This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(33)SXH
This command was integrated into Cisco IOS Release 12.2(33)SXH.
Cisco IOS XE Release 2.1
This command was introduced on Cisco ASR 1000 series devices.
12.4(24)T
Command output was updated to show the Dynamic Host Configuration Protocol (DHCP) originated addresses.
12.2(50)SY
This command was integrated into Cisco IOS Release 12.2(50)SY.
15.0(1)SY
This command was integrated into Cisco IOS Release 15.0(1)SY.
15.2(2)SNG
This command was implemented on the Cisco ASR 901 Series Aggregation Services devices.
15.3(1)S
This command was integrated into Cisco IOS Release 15.3(1)S.
Cisco IOS XE Release 3.2SE
This command was integrated into Cisco IOS XE Release 3.2SE.
15.2(2)SA2
This command was implemented on the Cisco ME 2600X Series Ethernet Access Switches.
Usage Guidelines
The
showipv6interface command provides output similar to the show ip interface command, except that it is IPv6-specific.
Use the
showipv6interface command to validate the IPv6 status of an interface and its configured addresses. The show ipv6 interface command also displays the parameters that IPv6 is using for operation on this interface and any configured features.
If the interface’s hardware is usable, the interface is marked up. If the interface can provide two-way communication for IPv6, the line protocol is marked up.
If you specify an optional interface type and number, the command displays information only about that specific interface. For a specific interface, you can enter the prefix keyword to see the IPv6 neighbor discovery (ND) prefixes that are configured on the interface.
Examples
Examples
The
showipv6interfacecommand displays information about the specified interface.
Device(config)# show ipv6 interface ethernet0/0
Ethernet0/0 is up, line protocol is up
IPv6 is enabled, link-local address is FE80::A8BB:CCFF:FE00:6700
No Virtual link-local address(es):
Global unicast address(es):
2001::1, subnet is 2001::/64 [DUP]
2001::A8BB:CCFF:FE00:6700, subnet is 2001::/64 [EUI]
2001:100::1, subnet is 2001:100::/64
Joined group address(es):
FF02::1
FF02::2
FF02::1:FF00:1
FF02::1:FF00:6700
MTU is 1500 bytes
ICMP error messages limited to one every 100 milliseconds
ICMP redirects are enabled
ICMP unreachables are sent
ND DAD is enabled, number of DAD attempts: 1
ND reachable time is 30000 milliseconds (using 30000)
ND advertised reachable time is 0 (unspecified)
ND advertised retransmit interval is 0 (unspecified)
ND router advertisements are sent every 200 seconds
ND router advertisements live for 1800 seconds
ND advertised default router preference is Medium
Hosts use stateless autoconfig for addresses.
The table below describes the significant fields shown in the display.
Table 31 show ipv6 interface Field Descriptions
Field
Description
Ethernet0/0 is up, line protocol is up
Indicates whether the interface hardware is active (whether line signal is present) and whether it has been taken down by an administrator. If the interface hardware is usable, the interface is marked "up." For an interface to be usable, both the interface hardware and line protocol must be up.
line protocol is up, down (down is not shown in sample output)
Indicates whether the software processes that handle the line protocol consider the line usable (that is, whether keepalives are successful or IPv6 CP has been negotiated). If the interface can provide two-way communication, the line protocol is marked up. For an interface to be usable, both the interface hardware and line protocol must be up.
IPv6 is enabled, stalled, disabled (stalled and disabled are not shown in sample output)
Indicates that IPv6 is enabled, stalled, or disabled on the interface. If IPv6 is enabled, the interface is marked "enabled." If duplicate address detection processing identified the link-local address of the interface as being a duplicate address, the processing of IPv6 packets is disabled on the interface and the interface is marked "stalled." If IPv6 is not enabled, the interface is marked "disabled."
link-local address
Displays the link-local address assigned to the interface.
Global unicast address(es):
Displays the global unicast addresses assigned to the interface.
Joined group address(es):
Indicates the multicast groups to which this interface belongs.
MTU
Maximum transmission unit of the interface.
ICMP error messages
Specifies the minimum interval (in milliseconds) between error messages sent on this interface.
ICMP redirects
The state of Internet Control Message Protocol (ICMP) IPv6 redirect messages on the interface (the sending of the messages is enabled or disabled).
ND DAD
The state of duplicate address detection on the interface (enabled or disabled).
number of DAD attempts:
Number of consecutive neighbor solicitation messages that are sent on the interface while duplicate address detection is performed.
ND reachable time
Displays the neighbor discovery reachable time (in milliseconds) assigned to this interface.
ND advertised reachable time
Displays the neighbor discovery reachable time (in milliseconds) advertised on this interface.
ND advertised retransmit interval
Displays the neighbor discovery retransmit interval (in milliseconds) advertised on this interface.
ND router advertisements
Specifies the interval (in seconds) for neighbor discovery router advertisements (RAs) sent on this interface and the amount of time before the advertisements expire.
As of Cisco IOS Release 12.4(2)T, this field displays the default router preference (DRP) value sent by this device on this interface.
ND advertised default router preference is Medium
The DRP for the device on a specific interface.
Examples
The
showipv6interface command displays information about attributes that may be associated with an IPv6 address assigned to the interface.
Attribute
Description
ANY
Anycast. The address is an anycast address, as specified when configured using the
ipv6 address command.
CAL
Calendar. The address is timed and has valid and preferred lifetimes.
DEP
Deprecated. The timed address is deprecated.
DUP
Duplicate. The address is a duplicate, as determined by duplicate address detection (DAD). To re-attampt DAD, the user must use the
shutdown or
no shutdown command on the interface.
EUI
EUI-64 based. The address was generated using EUI-64.
OFF
Offlink. The address is offlink.
OOD
Overly optimistic DAD. DAD will not be performed for this address. This attribute applies to virtual addresses.
PRE
Preferred. The timed address is preferred.
TEN
Tentative. The address is in a tentative state per DAD.
UNA
Unactivated. The virtual address is not active and is in a standby state.
VIRT
Virtual. The address is virtual and is managed by HSRP, VRRP, or GLBP.
The following is sample output from the
showipv6interfacecommand when entered with the
brief keyword:
Device# show ipv6 interface brief
Ethernet0 is up, line protocol is up
Ethernet0 [up/up]
unassigned
Ethernet1 [up/up]
2001:0DB8:1000:/29
Ethernet2 [up/up]
2001:0DB8:2000:/29
Ethernet3 [up/up]
2001:0DB8:3000:/29
Ethernet4 [up/down]
2001:0DB8:4000:/29
Ethernet5 [administratively down/down]
2001:123::210:7BFF:FEC2:ACD8
Interface Status IPv6 Address
Ethernet0 up 3FFE:C00:0:1:260:3EFF:FE11:6770
Ethernet1 up unassigned
Fddi0 up 3FFE:C00:0:2:260:3EFF:FE11:6772
Serial0 administratively down unassigned
Serial1 administratively down unassigned
Serial2 administratively down unassigned
Serial3 administratively down unassigned
Tunnel0 up unnumbered (Ethernet0)
Tunnel1 up 3FFE:700:20:1::12
Examples
This sample output shows the characteristics of an interface that has generated a prefix from a local IPv6 prefix pool:
Device# show ipv6 interface Ethernet 0/0 prefix
interface Ethernet0/0
ipv6 address 2001:0DB8::1/64
ipv6 address 2001:0DB8::2/64
ipv6 nd prefix 2001:0DB8:2::/64
ipv6 nd prefix 2001:0DB8:3::/64 2592000 604800 off-link
end
.
.
.
IPv6 Prefix Advertisements Ethernet0/0
Codes: A - Address, P - Prefix-Advertisement, O - Pool
U - Per-user prefix, D - Default
N - Not advertised, C - Calendar
default [LA] Valid lifetime 2592000, preferred lifetime 604800
AD 2001:0DB8:1::/64 [LA] Valid lifetime 2592000, preferred lifetime 604800
APD 2001:0DB8:2::/64 [LA] Valid lifetime 2592000, preferred lifetime 604800
P 2001:0DB8:3::/64 [A] Valid lifetime 2592000, preferred lifetime 604800
The default prefix shows the parameters that are configured using the ipv6 nd prefix default command.
Examples
This sample output shows the state of the DRP preference value as advertised by this device through an interface:
Device# show ipv6 interface gigabitethernet 0/1
GigabitEthernet0/1 is up, line protocol is up
IPv6 is enabled, link-local address is FE80::130
Description: Management network (dual stack)
Global unicast address(es):
FEC0:240:104:1000::130, subnet is FEC0:240:104:1000::/64
Joined group address(es):
FF02::1
FF02::2
FF02::1:FF00:130
MTU is 1500 bytes
ICMP error messages limited to one every 100 milliseconds
ICMP redirects are enabled
ND DAD is enabled, number of DAD attempts: 1
ND reachable time is 30000 milliseconds
ND advertised reachable time is 0 milliseconds
ND advertised retransmit interval is 0 milliseconds
ND router advertisements are sent every 200 seconds
ND router advertisements live for 1800 seconds
ND advertised default router preference is Low
Hosts use stateless autoconfig for addresses.
Examples
When HSRP IPv6 is first configured on an interface, the interface IPv6 link-local address is marked unactive (UNA) because it is no longer advertised, and the HSRP IPv6 virtual link-local address is added to the virtual link-local address list with the UNA and tentative DAD (TEN) attributes set. The interface is also programmed to listen for the HSRP IPv6 multicast address.
This sample output shows the status of UNA and TEN attributes, when HSRP IPv6 is configured on an interface:
Device# show ipv6 interface ethernet 0/0
Ethernet0/0 is up, line protocol is up
IPv6 is enabled, link-local address is FE80:2::2 [UNA]
Virtual link-local address(es):
FE80::205:73FF:FEA0:1 [UNA/TEN]
Global unicast address(es):
2001:2::2, subnet is 2001:2::/64
Joined group address(es):
FF02::1
FF02::2
FF02::66
FF02::1:FF00:2
MTU is 1500 bytes
ICMP error messages limited to one every 100 milliseconds
ND DAD is enabled, number of DAD attempts: 1
After the HSRP group becomes active, the UNA and TEN attributes are cleared, and the overly optimistic DAD (OOD) attribute is set. The solicited node multicast address for the HSRP virtual IPv6 address is also added to the interface.
This sample output shows the status of UNA, TEN and OOD attributes, when HSRP group is activated:
Device# show ipv6 interface ethernet 0/0
Ethernet0/0 is up, line protocol is up
IPv6 is enabled, link-local address is FE80:2::2 [UNA]
Virtual link-local address(es):
FE80::205:73FF:FEA0:1 [OPT]
Global unicast address(es):
2001:2::2, subnet is 2001:2::/64
Joined group address(es):
FF02::1
FF02::2
FF02::66
FF02::1:FF00:2
FF02::1:FFA0:1
MTU is 1500 bytes
ICMP error messages limited to one every 100 milliseconds
ICMP redirects are enabled
ND DAD is enabled, number of DAD attempts: 1
The table below describes additional significant fields shown in the displays for the
showipv6interface command with HSRP configured.
Table 32 show ipv6 interface Command with HSRP Configured Field Descriptions
Field
Description
IPv6 is enabled, link-local address is FE80:2::2 [UNA]
The interface IPv6 link-local address is marked UNA because it is no longer advertised.
FE80::205:73FF:FEA0:1 [UNA/TEN]
The virtual link-local address list with the UNA and TEN attributes set.
FF02::66
HSRP IPv6 multicast address.
FE80::205:73FF:FEA0:1 [OPT]
HSRP becomes active, and the HSRP virtual address marked OPT.
FF02::1:FFA0:1
HSRP solicited node multicast address.
Examples
When you enable Mobile IPv6 on an interface, you can configure a minimum interval between IPv6 router advertisement (RA) transmissions. The
showipv6interface command output reports the minimum RA interval, when configured. If the minimum RA interval is not explicitly configured, then it is not displayed.
In the following example, the maximum RA interval is configured as 100 seconds, and the minimum RA interval is configured as 60 seconds on Ethernet interface 1/0:
Device(config-if)# ipv6 nd ra-interval 100 60
Subsequent use of the
showipv6interface then displays the interval as follows:
Device(config)# show ipv6 interface ethernet 1/0
Ethernet1/0 is administratively down, line protocol is down
IPv6 is enabled, link-local address is FE80::A8BB:CCFF:FE00:5A01 [TEN]
No Virtual link-local address(es):
No global unicast address is configured
Joined group address(es):
FF02::1
FF02::2
MTU is 1500 bytes
ICMP error messages limited to one every 100 milliseconds
ICMP redirects are enabled
ICMP unreachables are sent
ND DAD is enabled, number of DAD attempts: 1
ND reachable time is 30000 milliseconds
ND advertised reachable time is 0 milliseconds
ND advertised retransmit interval is 0 milliseconds
ND router advertisements are sent every 60 to 100 seconds
ND router advertisements live for 1800 seconds
ND advertised default router preference is Medium
Hosts use stateless autoconfig for addresses.
In the following example, the maximum RA interval is configured as 100 milliseconds (ms), and the minimum RA interval is configured as 60 ms on Ethernet interface 1/0:
Device(config)# show ipv6 interface ethernet 1/0
Ethernet1/0 is administratively down, line protocol is down
IPv6 is enabled, link-local address is FE80::A8BB:CCFF:FE00:5A01 [TEN]
No Virtual link-local address(es):
No global unicast address is configured
Joined group address(es):
FF02::1
FF02::2
MTU is 1500 bytes
ICMP error messages limited to one every 100 milliseconds
ICMP redirects are enabled
ICMP unreachables are sent
ND DAD is enabled, number of DAD attempts: 1
ND reachable time is 30000 milliseconds
ND advertised reachable time is 0 milliseconds
ND advertised retransmit interval is 0 milliseconds
ND router advertisements are sent every 60 to 100 milliseconds
ND router advertisements live for 1800 seconds
ND advertised default router preference is Medium
Hosts use stateless autoconfig for addresses.
The table below describes additional significant fields shown in the displays for the
showipv6interface command with minimum RA interval information configured.
Table 33 show ipv6 interface Command with Minimum RA Interval Information Configuration Field Descriptions
Field
Description
ND router advertisements are sent every 60 to 100 seconds
ND RAs are sent at an interval randomly selected from a value between the minimum and maximum values. In this example, the minimum value is 60 seconds, and the maximum value is 100 seconds.
ND router advertisements are sent every 60 to 100 milliseconds
ND RAs are sent at an interval randomly selected from a value between the minimum and maximum values. In this example, the minimum value is 60 ms, and the maximum value is 100 ms.
Related Commands
Command
Description
ipv6ndprefix
Configures which IPv6 prefixes are included in IPv6 router advertisements.
ipv6ndrainterval
Configures the interval between IPv6 RA transmissions on an interface.
showipinterface
Displays the usability status of interfaces configured for IP.