Cisco IOS Software Releases 12.2 SR

Table Of Contents

MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs

Contents

Prerequisites for MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs

Restrictions for MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs

Information About MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs

VRF Concepts Similar for IPv4 and IPv6 VPNs

Single-Protocol VRF to Multiprotocol VRF Migration

Multiprotocol VRF Configurations Characteristics and Examples

Multiprotocol VRF Configuration: Single Protocol with Noncommon Policies Example

Multiprotocol VRF Configuration: Multiprotocol with Noncommon Policies Example

Multiprotocol VRF Configuration: Multiprotocol with Common Policies Example

Multiprotocol VRF Configuration: Multiprotocol with Common and Noncommon Policies

How to Configure MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs

Configuring a VRF for IPv4 and IPv6 VPNs

Associating a Multiprotocol VRF with an Interface

Verifying the MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs Configuration

Migrating from a Single-Protocol IPv4-Only VRF to a Multiprotocol VRF Configuration

Configuration Examples for MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs

Configuring a VRF for IPv4 and IPv6 VPNs: Example

Associating a Multiprotocol VRF with an Interface: Example

Migrating from a Single-Protocol IPv4-Only VRF Configuration to a Multiprotocol VRF Configuration: Example

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Command Reference

show vrf

vrf definition

vrf forwarding

vrf upgrade-cli

Feature Information for MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs

Glossary

MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs

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First Published: February 19, 2007

Last Updated: February 19, 2007

This document describes how to configure a Virtual Private Network (VPN) routing and forwarding (VRF) instance for IPv4 and IPv6 VPNs and describes how to upgrade your existing single-protocol IPv4-only VRF to a multiprotocol VRF configuration.

The MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs feature introduces Cisco IOS command-line interface (CLI) commands that allow you to enable an IPv4 and IPv6 VPN in the same VRF instance and to simplify the migration from a single-protocol VRF configuration to a multiprotocol VRF configuration.

Finding Feature Information in This Module

Your Cisco IOS software release may not support all of the features documented in this module. To reach links to specific feature documentation in this module and to see a list of the releases in which each feature is supported, use the "Feature Information for MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs" section.

Finding Support Information for Platforms and Cisco IOS and Catalyst OS Software Images

Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Contents

•Prerequisites for MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs

•Restrictions for MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs

•Information About MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs

•How to Configure MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs

•Configuration Examples for MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs

•Additional References

•Command Reference

•Feature Information for MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs

•Glossary

Prerequisites for MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs

The MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs feature has the following prerequisites:

•For migration—An IPv4 Multiprotocol Label Switching (MPLS) VPN VRF must exist.

•For a new VRF configuration—Cisco Express Forwarding and an MPLS label distribution method, either Label Distribution Protocol (LDP) or MPLS Traffic Engineering (TE), must be enabled on all routers in the core, including the provider edge (PE) routers.

Restrictions for MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs

The MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs feature has the following restrictions:

•Once you have converted to a multiprotocol VRF, you cannot convert the VRF back to an IPv4-only single-protocol VRF.

•You can associate an interface with only one VRF. You cannot configuring a VRF for IPv4 and a different VRF for IPv6 on the same interface.

•You can configure only IPv4 and IPv6 address families in a multiprotocol VRF. Other protocols (IPX, Appletalk, and the like) are not supported.

Information About MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs

Before you use the MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs feature to migrate from a single-protocol VRF to a multiprotocol VRF, you should understand the following:

•VRF Concepts Similar for IPv4 and IPv6 VPNs

•Single-Protocol VRF to Multiprotocol VRF Migration

•Multiprotocol VRF Configurations Characteristics and Examples

VRF Concepts Similar for IPv4 and IPv6 VPNs

VPNs for IPv6 use the same VRF concepts that IPv4 VPNs use, such as address families, route distinguishers, route targets, and VRF identifiers. Customers that use both IPv4 and IPv6 VPNs might want to share VRF policies between address families. They might want a way to define applicable VRF policies for all address families, instead of defining VRF policies for an address family individually as they do for or a single-protocol IPv4-only VRF.

Prior to Cisco IOS Release 12.2(33)SRB, a VRF applied only to an IPv4 address family. A one-to-one relationship existed between the VRF name and a routing and forwarding table identifier, between a VRF name and a route distinguisher (RD), and between a VRF name and a VPN ID. This configuration is called a single-protocol VRF.

Cisco IOS Release 12.2(33)SRB introduces support for a multiple address-family (multi-AF) VRF structure. The multi-AF VRF allows you to define multiple address families under the same VRF. A given VRF, identified by its name and a set of policies, can apply to both an IPv4 VPN and an IPv6 VPN at the same time. This VRF can be activated on a given interface, even though the routing and forwarding tables are different for the IPv4 and IPv6 protocols. This configuration is called a multiprotocol VRF.

Single-Protocol VRF to Multiprotocol VRF Migration

Prior to Cisco IOS Release 12.2(33)SRB, you could create a single protocol IPv4-only VRF. You created a single-protocol VRF by entering the ip vrf command. To activate the single-protocol VRF on an interface, you entered the ip vrf forwarding (interface configuration) command.

After the introduction of the MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs feature in Cisco IOS Release 12.2(33)SRB, you create a multiprotocol VRF by entering the vrf definition command. To activate the multiprotocol VRF on an interface, you enter the vrf forwarding command.

The MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs feature introduces the vrf upgrade-cli multi-af-mode {common-policies | non-common-policies} [vrf vrf-name] command that forces VRF configuration migration from a single-protocol VRF model to a multiprotocol VRF model:

•If the route-target policies apply to all address families configured in the multi-AF VRF, select the common-policies keyword.

•If the route-target policies apply only to the IPv4 address family that you are migrating, select the non-common-policies keyword.

After you enter the vrf upgrade-cli command and save the configuration to NVRAM, the single-protocol VRF configuration is saved as a multiprotocol VRF configuration. In the upgrade process, the ip vrf command is converted to the vrf definition command (global configuration commands) and the ip vrf forwarding command is converted to the vrf forwarding command (interface configuration command). The vrf upgrade-cli command has a one-time immediate effect.

You might have both IPv4-only VRFs and multiprotocol VRFs on your router. Once you create a VRF, you can edit it using only the commands in the mode in which it was created. For example, you created a VRF named vrf2 with the following multiprotocol VRF commands:

Router# configure terminal

Enter configuration command, one per line. End with CNTL/Z

Router(config)# vrf definition vrf2

Router(config-vrf)# rd 2:2

Router(config-vrf)# route-target import 2:2

Router(config-vrf)# route-target export 2:2

Router(config-vrf)# end

If you try to edit VRF vrf2 with IPv4-only VRF commands, you receive the following message:

Router# configure terminal

Enter configuration command, one per line. End with CNTL/Z

Router(config)# ip vrf vrf2

% Use `vrf definition vrf2' command 

If you try to edit an IPv4-only VRF with the multiprotocol VRF commands, you would receive this message, where <vrf-name> is the name of the IPv4-only VRF:

% Use `ip vrf <vrf-name>' command

The ip vrf name and ip vrf forwarding (interface configuration) name commands will be available for a period of time before they are removed. Use the vrf upgrade command to migrate your older IPv4-only VRFs to the new multiprotocol VRF configuration. When you need to create a new VRF—whether the VRF is for an IPv4 VPN, or IPv6 VPN, or both—use the multiprotocol VRF vrf definition and vrf forwarding commands that support a multi-AF configuration.

Multiprotocol VRF Configurations Characteristics and Examples

In a multiprotocol VRF, you can configure both IPv4 VRFs and IPv6 VRFs under the same address family or configure separate VRFs for each IPv4 or IPv6 address family. The multiprotocol VRF configuration has the following characteristics:

•The VRF name identifies a VRF, which might have both IPv4 and IPv6 address families. On the same interface, you cannot have IPv4 and IPv6 address families using different VRF names.

•The RD, VPN ID, and SNMP context are shared by both IPv4 and IPv6 address families for a given VRF.

•The policies (route target, for example) specified in multi-AF VRF mode, outside the address-family configuration, are defaults to be applied to each address family. Route targets are the only VRF characteristics that can be defined inside and outside an address family.

The following is also true when you associate a multiprotocol VRF with an interface:

•Binding an interface to a VRF (vrf forwarding vrf-name command) removes all IPv4 and IPv6 addresses configured on that interface.

•Once you associate a VRF with a given interface, all active address families belong to that VRF. The exception is when no address of the address-family type is configured, in which case the protocol is disabled.

•Configuring an address on an interface that is bound to a VRF requires that the address family corresponding to the address type is active for that VRF. Otherwise, an error message is issued stating that the address family must be activated first in the VRF.

Backward compatibility with the single-protocol VRF CLI is supported in Cisco IOS Release 12.2(33)SRB. This means that you might have single-protocol and multiprotocol CLI on the same router, but not in the same VRF configuration.

The single-protocol CLI continues to allow you to define an IPv4 address within a VRF and an IPv6 address in the global routing table on the same interface.

The following sections have multiprotocol VRF configuration examples:

•Multiprotocol VRF Configuration: Single Protocol with Noncommon Policies Example

•Multiprotocol VRF Configuration: Multiprotocol with Noncommon Policies Example

•Multiprotocol VRF Configuration: Multiprotocol with Common Policies Example

•Multiprotocol VRF Configuration: Multiprotocol with Common and Noncommon Policies

Multiprotocol VRF Configuration: Single Protocol with Noncommon Policies Example

The following is an example of a multiprotocol VRF configuration for a single protocol (IPv4) with route-target policies in the address-family configuration:

vrf definition vrf2

 rd 2:2

 !

 address-family ipv4

 route-target export 2:2

 route-target import 2:2

 exit-address-family

The RD (2:2) applies to all address families defined for VRF vrf2.

Multiprotocol VRF Configuration: Multiprotocol with Noncommon Policies Example

The following is an example of a multiprotocol VRF configuration for IPv4 and IPv6 VPNs in which the route-target policies are defined in the separate address-family configurations:

vrf definition vrf2

 rd 2:2

 !

 address-family ipv4

 route-target export 2:2

 route-target import 2:2

 exit-address-family

 !

 address-family ipv6

 route-target export 3:3

 route-target import 3:3

 exit-address-family

Multiprotocol VRF Configuration: Multiprotocol with Common Policies Example

The following is an example of a multiprotocol VRF configuration for IPv4 and IPv6 VPNs with route-target policies defined in the global part of the VRF:

vrf definition vrf2

 rd 2:2

 route-target export 2:2

 route-target import 2:2

  !

 address-family ipv4

 exit-address-family

 !

 address-family ipv6

 exit-address-family

The route-target policies are defined outside the address-family configurations. Therefore, the policies apply to all address families defined in VRF vrf2.

Multiprotocol VRF Configuration: Multiprotocol with Common and Noncommon Policies

The following is an example of a multiprotocol VRF with route-target policies defined in both global and address-family areas:

•For IPv6, the route-target definitions are defined under the address family. These definitions are used and the route-target definitions in the global area are ignored. Therefore, the IPv6 VPN ignores import 100:2.

•For IPv4, no route-target policies are defined under the address family, therefore, the global definitions are used.

vrf definition vfr1

 route-target export 100:1

 route-target import 100:1

 route-target import 100:2

 !

 address-family ipv4

 exit-address-family

 !

 address-family ipv6

 route-target export 100:1

 route-target import 100:1

 route-target import 100:3

 exit-address-family

How to Configure MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs

This feature provides Cisco IOS CLI commands that allow you to configure a multiprotocol VRF (IPv4 and IPv6 VPNs in the same VRF) and to migrate a single-protocol VRF configuration (IPv4-only VRF) to a multiprotocol VRF configuration.

A multiprotocol VRF allows you to share route targets policies (import and export) between IPv4 and IPv6 or to configure separate route-target policies for IPv4 and IPv6 VPNs.

Perform the following tasks to configure or migrate to the MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs feature:

•Configuring a VRF for IPv4 and IPv6 VPNs (required)

•Associating a Multiprotocol VRF with an Interface (required)

•Verifying the MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs Configuration (optional)

Perform the following task to migrate from a single-protocol VRF to a multiprotocol VRF configuration:

•Migrating from a Single-Protocol IPv4-Only VRF to a Multiprotocol VRF Configuration

Configuring a VRF for IPv4 and IPv6 VPNs

Perform the following task to configure a VRF for IPv4 and IPv6 VPNs. When you configure a VRF for both IPv4 and IPv6 VPNs (a multiprotocol VRF), you can choose to configure route-target policies that apply to all address-families in the VRF or you can configure route-target policies that apply to individual address families in the VRF.

The following task shows how to configure a VRF that has that has route-target policies defined for IPv4 and IPv6 VPNs in separate VRF address families.

SUMMARY STEPS

1. enable

2. configure terminal

3. vrf definition vrf-name

4. rd route-distinguisher

5. address-family {ipv4 | ipv6}

6. route-target {import | export | both} route-target-ext-community

7. exit-address-family

8. address-family {ipv4 | ipv6}

9. route-target {import | export | both} route-target-ext-community

10. end

DETAILED STEPS

	Command or Action	Purpose
Step 1	enable Example: Router> enable	Enables privileged EXEC mode. •Enter your password if prompted.
Step 2	configure terminal Example: Router# configure terminal	Enters global configuration mode.
Step 3	vrf definition vrf-name Example: Router(config)# vrf definition vrf1	Configures a VRF routing table and enters VRF configuration mode. •The vrf-name argument is the name of the VRF.
Step 4	rd route-distinguisher Example: Router(config-vrf)# rd 100:1	Creates routing and forwarding tables for a VRF. •The route-distinguisher argument specifies to add an 8-byte value to an IPv4 prefix to create a VPN IPv4 prefix. You can enter a route distinguisher in either of these formats: –16-bit ASN (autonomous system number): your 32-bit number For example, 101:3. –32-bit IP address: your 16-bit number For example, 192.168.122.15:1.
Step 5	address-family {ipv4 | ipv6} Example: Router(config-vrf) address-family ipv4	Enters VRF address family configuration mode. •The ipv4 keyword specifies an address family for an IPv4 VPN. •The ipv6 keyword specifies an address family for an IPv6 VPN.
Step 6	route-target {import | export | both} route-target-ext-community Example: Router(config-vrf-af)# route-target both 100:2	Creates a route-target extended community for a VRF. •The import keyword specifies to import routing information from the target VPN extended community. •The export keyword specifies to export routing information to the target VPN extended community. •The both keyword specifies to import both import and export routing information to the target VPN extended community. •The route-target-ext-community argument adds the route-target extended community attributes to the VRF's list of import, export, or both (import and export) route-target extended communities.
Step 7	exit-address-family Example: Router(config-vrf-af)# exit-address-family	Exits from VRF address family configuration mode.
Step 8	address-family {ipv4 | ipv6} Example: Router(config-vrf) address-family ipv6	Enters VRF address family configuration mode. •The ipv4 keyword specifies an address family for an IPv4 VPN. •The ipv6 keyword specifies an address family for an IPv6 VPN.
Step 9	route-target {import | export | both} route-target-ext-community Example: Router(config-vrf-af)# route-target both 100:3	Creates a route-target extended community for a VRF. •The import keyword specifies to import routing information from the target VPN extended community. •The export keyword specifies to export routing information to the target VPN extended community. •The both keyword specifies to import both import and export routing information to the target VPN extended community. •The route-target-ext-community argument adds the route-target extended community attributes to the VRF's list of import, export, or both (import and export) route-target extended communities.
Step 10	end Example: Router(config-vrf-af)# end	Exits to privileged EXEC mode.

Associating a Multiprotocol VRF with an Interface

Perform the following task to associate a multiprotocol VRF with an interface. Associating the VRF with an interface activates the VRF.

SUMMARY STEPS

1. enable

2. configure terminal

3. interface type number

4. vrf forwarding vrf-name

5. ip address ip-address mask [secondary]

6. ipv6 address {ipv6-address/prefix-length | prefix-name sub-bits/prefix-length}

7. end

DETAILED STEPS

	Command or Action	Purpose
Step 1	enable Example: Router> enable	Enables privileged EXEC mode. •Enter your password if prompted.
Step 2	configure terminal Example: Router# configure terminal	Enters global configuration mode.
Step 3	interface type number Example: Router(config)# interface Ethernet 0/1	Configures an interface type and enters interface configuration mode. •The type argument identifies the type of interface to be configured. •The number argument identifies the port, connector, or interface card number.
Step 4	vrf forwarding vrf-name Example: Router(config-if)# vrf forwarding vrf1	Associates a VRF with an interface or subinterface. •The vrf-name argument is the name of the VRF.
Step 5	ip address ip-address mask [secondary] Example: Router(config-if)# ip address 10.24.24.24 255.255.255.255	Sets a primary or secondary IP address for an interface. •The ip-address argument is the IP address. •The mask argument is the mask of the associated IP subnet. •The secondary keyword specifies that the configured address is a secondary IP address. If this keyword is omitted, the configured address is the primary IP address.
Step 6	ipv6 address {ipv6-address/prefix-length | prefix-name sub-bits/prefix-length} Example: Router(config-if)# ipv6 address 2001:0DB8:0300:0201::/64	Configures an IPv6 address based on an IPv6 general prefix and enables IPv6 processing on an interface. •The ipv6-address argument is the IPv6 address to be used. •The prefix-length argument is the length of the IPv6 prefix, which is a decimal value that indicates how many of the high-order contiguous bits of the address comprise the prefix (the network portion of the address). A slash mark must precede the decimal value. •The prefix-name argument is a general prefix that specifies the leading bits of the network to be configured on the interface. •The sub-bits argument is the subprefix bits and host bits of the address to be concatenated with the prefixes provided by the general prefix specified with the prefix-name argument. The sub-bits argument must be in the form documented in RFC 2373 where the address is specified in hexadecimal using 16-bit values between colons.
Step 7	end Example: Router(config-if) end	Exits to privileged EXEC mode.

Verifying the MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs Configuration

Perform the following task to verify the MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs feature configuration, that is, show that the VRF configuration is upgraded to a multi-AF multiprotocol VRF.

SUMMARY STEPS

1. enable

2. show running-config vrf [vrf-name]

3. show vrf

4. show vrf detail [vrf-name]

5. end

DETAILED STEPS

---

Step 1 enable

Use this command to enable privileged EXEC mode. Enter your password, if prompted. For example:

Router> enable

Router#

Step 2 show running-config vrf [vrf-name]

Use this command to verify that the upgrade to a multi-AF multiprotocol VRF configuration was successful. The following is sample command output before the upgrade to a multi-AF multiprotocol VRF:

Router# show running-config vrf vpn2

Building configuration...

Current configuration : 604 bytes

ip vrf vpn2

 rd 1:1

 route-target export 1:1

 route-target import 1:1

!

!

interface Loopback1

 ip vrf forwarding vpn2

 ip address 10.43.43.43 255.255.255.255

!

The following is sample command output after you upgrade to a multi-AF multiprotocol VRF with common policies for all address families:

Router# show running-config vrf vpn1

Building configuration...

Current configuration : 604 bytes

vrf definition vpn1

 rd 1:1

 route-target export 1:1

 route-target import 1:1

!

 address-family 1pv4

 exit-address-family

!

!

interface Loopback1

 ip vrf forwarding vpn1

 ip address 10.43.43.43 255.255.255.255

!

This configuration contains the vrf definition command. The vrf definition command replaces the ip vrf command in the multi-AF multiprotocol VRF configuration.

Step 3 show vrf

Use this command to verify that the upgrade to a multi-AF multiprotocol VRF configuration was successful. The show vrf command replaces the show ip vrf command when a VRF configuration is updated to a multi-AF multiprotocol VRF configuration. The show vrf command displays the protocols defined for a VRFs. The following command shows sample output after you upgrade a single-protocol VRF configuration to a multi-AF multiprotocol VRF configuration:

Router# show vrf vpn1

  Name                           Default RD     Protocols         Interfaces

  vpn1                           1:1            ipv4              Lo1/0

The following is sample output from the show ip vrf vp1 command. Compare this to the output of the show vrf vpn1 command. The protocols under the VRF are not displayed.

Router# show ip vrf vrf1

  Name      Default RD   Interface

  vpn1      1:1          Loopback1

The following is sample output from the show vrf command for multiprotocol VRFs, one of which contains both IPv4 and IPv6 protocols:

Router# show vrf

  Name                           Default RD     Protocols         Interfaces

  vpn1                           1:1            ipv4              Lo1/0

  vpn2                           100:3          ipv4              Lo23  AT3/0/0.1

  vpn4                           100:2          ipv4,ipv6 

Step 4 show vrf detail [vrf-name]

Use this command to display all characteristics of the defined VRF to verify that the configuration is as you expected. For example, if your VRF configuration for VRF vpn1 is as follows:

vrf definition vpn1

 route-target export 100:1

 route-target import 100:1

 route-target import 100:2

 !

 address-family ipv4

 exit-address-family

 !

 address-family ipv6

 route-target export 100:1

 route-target import 100:1

 route-target import 100:3

 exit-address-family

This command would display the following:

Router# show vrf detail vpn1

VRF vpn1 (VRF Id = 3); default RD <not set>; default VPNID <not set>

  No interfaces

Address family ipv4 (Table ID = 3 (0x3)):

  Connected addresses are not in global routing table

  Export VPN route-target communities

    RT:100:1                

  Import VPN route-target communities

    RT:100:1                 RT:100:2             

  No import route-map

  No export route-map

  VRF label distribution protocol: not configured

  VRF label allocation mode: per-prefix

Address family ipv6 (Table ID = 503316483 (0x1E000003)):

  Connected addresses are not in global routing table

  Export VPN route-target communities

    RT:100:1                

  Import VPN route-target communities

    RT:100:1                 RT:100:3                

  No import route-map

  No export route-map

  VRF label distribution protocol: not configured

  VRF label allocation mode: per-prefix

Step 5 exit

Use this command to exit to user EXEC mode. For example:

Router# exit

Router>

---

Migrating from a Single-Protocol IPv4-Only VRF to a Multiprotocol VRF Configuration

Perform the following task to force migration from a single-protocol IPv4-only VRF to a multiprotocol VRF configuration.

The multiprotocol VRF configuration allows you to define multiple address families under the same VRF. A given VRF, identified by its name and a set of policies, can apply to both an IPv4 VPN and an IPv6 VPN at the same time. This VRF can be activated on a given interface, even though the routing and forwarding tables are different for the IPv4 and IPv6 protocols.

SUMMARY STEPS

1. enable

2. configure terminal

3. vrf upgrade-cli multi-af-mode {common-policies | non-common-policies} [vrf vrf-name]

4. exit

5. show running-config vrf vrf-name

DETAILED STEPS

	Command or Action	Purpose
Step 1	enable Example: Router> enable	Enables privileged EXEC mode. •Enter your password if prompted.
Step 2	configure terminal Example: Router# configure terminal	Enters global configuration mode.
Step 3	vrf upgrade-cli multi-af-mode {common-policies | non-common-policies} [vrf vrf-name] Example: Router(config)# vrf upgrade-cli multi-af-mode common-policies vrf vpn4	Upgrades a VRF instance or all VRFs configured on the router to support multiple address families under the same VRF. •The multi-af-mode keyword specifies an upgrade of a single-protocol VRF or all VRFs to a multiprotocol VRF that supports multi-AFs configuration. •The common-policies keyword specifies to copy the route-target policies to the common part of the VRF configuration so that the policies apply to all address families configured in the multi-AF VRF. •The non-common-policies keyword specifies to copy the route-target policies to the IPv4 address family part of the VRF configuration so that the policies apply only to IPv4. •The vrf keyword specifies a VRF for the upgrade to a multi-AF VRF configuration. •The vrf-name argument is the name of the single-protocol VRF to upgrade to a multi-AF VRF configuration.
Step 4	exit Example: Router(config)# exit	Exits to privileged EXEC mode.
Step 5	show running-config vrf [vrf-name] Example: Router# show running-config vrf vpn4	Displays the subset of the running configuration of a router that is linked to a specific VRF instance or to all VRFs configured on the router. •The vrf-name argument is the name of the VRF of which you want to display the configuration. Note The Cisco IOS image that supports the multiprotocol VRF commands might not support the show running-config vrf command. You can use the show running-config command instead.

Configuration Examples for MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs

The following examples show how to use the VRF CLI provided by the MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs feature to migrate from a single-protocol VRF to a multiprotocol VRF configuration:

•Configuring a VRF for IPv4 and IPv6 VPNs: Example

•Associating a Multiprotocol VRF with an Interface: Example

•Migrating from a Single-Protocol IPv4-Only VRF Configuration to a Multiprotocol VRF Configuration: Example

Configuring a VRF for IPv4 and IPv6 VPNs: Example

The following example shows how to configure a VRF for IPv4 and IPv6 VPNs:

configure terminal

!

vrf definition vrf1

 rd 100:1

!

 address-family ipv4

 route-target both 100:2

 exit-address-family

!

 address-family ipv6

 route-target import 100:3

 route-target export 100:3

 exit-address-family

 end

In this example, noncommon policies are defined in the address-family configuration.

The following is an example of a VRF for IPv4 and IPv6 that has common policies defined in the global part of the VRF configuration:

configure terminal

!

vrf definition vrf2

 rd 200:1

 route-target import 200:2

 route-target export 200:2

!

 address-family ipv4

 exit-address-family

!

 address-family ipv6

 exit-address-family

 end

Associating a Multiprotocol VRF with an Interface: Example

The following example shows how to associate a multiprotocol VRF with an interface:

configure terminal

!

interface Ethernet 0/1

 vrf forwarding vrf1

 ip address 10.24.24.24 255.255.255.255

 ipv6 address 2001:0DB8:0300:0201::/64 

 end

Migrating from a Single-Protocol IPv4-Only VRF Configuration to a Multiprotocol VRF Configuration: Example

This section contains examples that show how to migrate from a single-protocol IPv4-only VRF to a multiprotocol VRF configuration.

This example shows a single-protocol IPv4-only VRF before the Cisco IOS VRF CLI for IPv4 and IPv6 is entered on the router:

ip vrf vrf1

 rd 1:1

 route-target export 1:1

 route-target import 1:1

interface Loopback1

 ip vrf forwarding V1

 ip address 10.3.3.3 255.255.255.255

This example shows how to force the migration of the single-protocol VRF vrf1 to a multiprotocol VRF configuration:

Router# configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

!

Router(config)# vrf upgrade-cli multi-af-mode common-policies vrf vrf1

You are about to upgrade to the multi-AF VRF syntax commands. 
You will loose any IPv6 address configured on interfaces 
belonging to upgraded VRFs. 
Are you sure ? [yes]: yes

Number of VRFs upgraded: 1

Router(config)# exit

This example shows the multiprotocol VRF configuration after the forced migration:

vrf definition vrf1

 rd 1:1

 route-target export 1:1

 route-target import 1:1

 !

 address-family ipv4

 exit-address-family

!

interface Loopback1

 vrf forwarding V1

 ip address 10.3.3.3 255.255.255.255

The following is another example of a multi-AF multiprotocol VRF configuration:

vrf definition vrf2

 rd 100:1 

 address family ipv6

 route-target 200:1 both 

 exit-address-family

!

ip vrf vrf1

 rd 200:1 

 route-target 200:1 both

!

interface Ethernet0/0

 vrf forwarding vrf2

 ip address 10.50.1.2 255.255.255.0

 ipv6 address 2001:0DB8:0:1::/64 

!

interface Ethernet0/1

 ip vrf forwarding vrf1

 ip address 10.60.1.2 255.255.255.0

 ipv6 address 2001:0DB8:1 :1::/64 

In this example, all addresses (IPv4 and IPv6) defined for interface Ethernet0/0 are in VRF vrf2. For the interface Ethernet0/1, the IPv4 address is defined in VRF vrf1 but the IPv6 address is in the global IPv6 routing table.

Additional References

The following sections provide references related to the MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs feature.

Related Documents

Related Topic	Document Title
Configuration tasks for MPLS VPNs	"Part 4: MPLS Virtual Private Networks," Cisco IOS Multiprotocol Label Switching Configuration Guide, Release 4
Commands for configuring MPLS and MPLS VPNs	Cisco IOS Multiprotocol Label Switching Command Reference, Release 12.2SR
Configuration tasks for MPLS	"Configuring Multiprotocol Label Switching" chapter in the Cisco IOS Multiprotocol Label Switching Configuration Guide, Release 4

Standards

Standard	Title
No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature.	—

MIBs

MIB	MIBs Link
No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature.	To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: http://www.cisco.com/go/mibs

RFCs

RFC	Title
RFC 1771	A Border Gateway Protocol 4 (BGP-4)
RFC 4364	BGP MPLS/IP Virtual private Networks (VPNs)

Technical Assistance

Description	Link
The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies. Access to most tools on the Cisco Support website requires a Cisco.com user ID and password. If you have a valid service contract but do not have a user ID or password, you can register on Cisco.com.	http://www.cisco.com/techsupport

Command Reference

This section documents only commands that are new or modified.

•show vrf

•vrf definition

•vrf forwarding

•vrf upgrade-cli

show vrf

To display the defined Virtual Private Network (VPN) routing and forwarding (VRF) instances, use the show vrf command in user EXEC or privileged EXEC mode.

show vrf [ipv4 | ipv6] [interface | brief | detail | id | select] [vrf-name]

Syntax Description

ipv4	(Optional) Displays IPv4 address-family type VRF instances.
ipv6	(Optional) Displays IPv6 address-family type VRF instances.
interface	(Optional) Displays the interface associated with the specified VRF instances.
brief	(Optional) Displays brief information about the specified VRF instances.
detail	(Optional) Displays detailed information about the specified VRF instances.
id	(Optional) Displays VPN-ID information for the specified VRF instances.
select	(Optional) Displays selection information for the specified VRF instances.
vrf-name	(Optional) Name assigned to a VRF.

Command Default

If you do not specify any arguments or keywords, the command displays concise information about all configured VRFs.

Command Modes

User EXEC
Privileged EXEC

Command History

Release	Modification
12.2(33)SRB	This command was introduced.

Usage Guidelines

Use the show vrf command to display information about specified VRF instances or all VRF instances. Specify no arguments or keywords to display information on all VRF instances.

Examples

The following is sample output from the show vrf command that displays brief information about all configured VRF instances:

Router# show vrf 

  Name                             Default RD          Protocols   Interfaces

  N1                               100:0               ipv4,ipv6   

  V1                               1:1                 ipv4        Lo1

  V2                               2:2                 ipv4,ipv6   Et0/1.1

                                                                   Et0/1.2

                                                                   Et0/1.3

  V3                               3:3                 ipv4        Lo3

                                                                   Et0/1.4

Table 1 describes the significant fields shown in the display.

Table 1 show vrf Field Descriptions 

Field	Description
Name	Name of the VRF instance.
Default RD	The default route distinguisher for the specified VRF instances.
Protocols	The address-family protocol type for the specified VRF instance.
Interfaces	The network interface associated with the VRF instance.

The following example displays output from the show vrf command with the detail keyword. The information shown is for a VRF named cisco1.

Router# show vrf detail

VRF cisco1; default RD 100:1; default VPNID <not set>

  Interfaces:

    Ethernet0/0                  Loopback10

Address family ipv4 (Table ID = 0x1):

  Connected addresses are not in global routing table

  Export VPN route-target communities

    RT:100:1

  Import VPN route-target communities

    RT:100:1

  No import route-map

  No export route-map

  VRF label distribution protocol: not configured

Address family ipv6 (Table ID = 0xE000001):

  Connected addresses are not in global routing table

  Export VPN route-target communities

    RT:100:1

  Import VPN route-target communities

    RT:100:1

  No import route-map

  No export route-map

  VRF label distribution protocol: not configured

Table 2 describes the significant fields shown in the display.

Table 2 show vrf detail Field Descriptions 

Field	Description
default RD 100:1	The route distinguisher (RD) given to this VRF.
Interfaces:	Interfaces to which the VRF is attached.
Export VPN route-target communities   RT:100:1	Route target VPN extended communities to be exported.
Import VPN route-target communities   RT:100:1	Route target VPN extended communities to be imported.

Related Commands

Command	Description
vrf definition	Configures a VRF routing table instance and enters VRF configuration mode.
vrf forwarding	Associates a VRF instance with an interface or subinterface.

vrf definition

To configure a Virtual Private Network (VPN) routing and forwarding (VRF) routing table instance and enter VRF configuration mode, use the vrf definition command in global configuration mode. To remove a VRF routing table, use the no form of this command.

vrf definition vrf-name

no vrf definition vrf-name

Syntax Description

vrf-name

Name assigned to a VRF.

Command Default

No VRFs are defined.
No import or export lists are associated with a VRF.
No route maps are associated with a VRF.

Command Modes

Global configuration

Command History

Release	Modification
12.2(33)SRB	This command was introduced.

Usage Guidelines

Use the vrf definition command to give a VRF a name and to enter VRF configuration mode. Once the router is in VRF configuration mode, use the rd command to give the VRF a route distinguisher. The rd command creates the routing and forwarding tables and associates the route distinguisher (RD) with the VRF instance named in the vrf-name argument.

Users can configure shared route targets (import and export) between IPv4 and IPv6. This feature is useful in a migration scenario, where IPv4 policies already are configured and IPv6 policies should be the same as the IPv4 policies. You can configure separate route-target policies for IPv4 and IPv6 VPNs in address family configuration mode. Enter address family configuration mode from VRF configuration mode.

In VRF configuration mode, you can also associate a Simple Network Management Protocol (SNMP) context with the named VRF and configure or update a VPN ID.

Examples

The following example assigns the name vrf1 to a VRF, enters VRF configuration mode, and configures a route distinguisher, 100:20:

Router(config)# vrf definition vrf1

Router(config-vrf)# rd 100:20

Related Commands

Command	Description
address-family	Enters address family configuration mode for configuring routing protocols such as BGP, RIP, and static routing.
context	Associates an SNMP context with a particular VRF.
rd	Specifies a route distinguisher.
route-target	Creates a route-target extended community for a VPN VRF.
vpn id	Sets or updates a VPN ID on a VRF.
vrf forwarding	Associates a VRF instance with an interface or subinterface.

vrf forwarding

To associate a Virtual Private Network (VPN) routing and forwarding (VRF) instance with an interface or subinterface, use the vrf forwarding command in interface configuration mode. To disassociate a VRF from an interface, use the no form of this command.

vrf forwarding vrf-name

no vrf forwarding vrf-name

Syntax Description

vrf-name

Name assigned to a VRF.

Command Default

The default for an interface is the global routing table.

Command Modes

Interface configuration

Command History

Release	Modification
12.2(33)SRB	This command was introduced.

Usage Guidelines

Use the vrf forwarding command to associate an interface with a VRF. When the interface is bound to a VRF, previously configured IPv4 and IPv6 addresses are removed, and they must be reconfigured.

Examples

The following example shows how to associate a VRF named site1 to serial interface 0/0 and configure an IPv6 and an IPv4 address:

interface Serial0/0

 vrf forwarding site1

 ipv6 address 2001:100:1:1000::72b/64

 ip address 10.11.11.1 255.255.255.0

Related Commands

Command	Description
vrf definition	Configures a VRF routing table instance and enters VRF configuration mode.

vrf upgrade-cli

To upgrade a Virtual Private Network (VPN) routing and forwarding (VRF) instance or all VRFs on the router to support multiple address families (multi-AFs) for the same VRF, use the vrf upgrade-cli command in global configuration mode.

vrf upgrade-cli multi-af-mode {common-policies | non-common-policies} [vrf vrf-name]

Syntax Description

multi-af-mode	Specifies an upgrade of a single-protocol VRF or all VRFs to a multiprotocol VRF that supports multi-AFs configuration.
common-policies	Specifies to copy the route-target policies to the common part of the VRF configuration so that the policies apply to all address families configured in the multi-AF VRF.
non-common-policies	Specifies to copy the route-target policies to the IPv4 address family part of the VRF configuration so that the policies apply only to an IPv4 VRF.
vrf	(Optional) Specifies a VRF for the upgrade to a multi-AF VRF configuration.
vrf-name	(Optional) The name of the single-protocol VRF to upgrade to a multi-AF VRF configuration.

Command Default

If you do not enter the name of a specific single-protocol VRF, all VRFs defined on the router are upgraded to the multi-AF VRF configuration.

Command Modes

Global configuration

Command History

Release	Modification
12.2(33)SRB	This command was introduced.

Usage Guidelines

The vrf upgrade-cli command is used to upgrade a specified single-protocol VRF (IPv4-only VRF) configuration or all single-protocol VRF configurations on the router to a multiprotocol VRF that supports multi-AF configuration.

The upgrade is automatic and does not require any further configuration. After you enter the vrf upgrade-cli command, the single-protocol VRF configuration is lost when you save the configuration to NVRAM. A multiprotocol VRF configuration is saved.

If your configuration requires that all route-target policies (import, export, both) apply to all address families, you enter the vrf upgrade-cli multi-af-mode common-policies command. If your configuration requires that these policies apply to IPv4 VPNs only, enter the vrf upgrade-cli multi-af-mode non-common-policies command.

After the upgrade to a multiprotocol VRF is complete, you can edit the VRF only with multiprotocol VRF configuration commands.

Examples

The following example shows how to upgrade a single-protocol VRF configuration named vrf1 to a multi-AF VRF configuration and apply the common policies of vrf1 to all address families defined for the VRF:

Router# configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

!

Router(config)# vrf upgrade-cli multi-af-mode common-policies vrf vrf1

You are about to upgrade to the multi-AF VRF syntax commands. 
You will loose any IPv6 address configured on interfaces 
belonging to upgraded VRFs. 
Are you sure ? [yes]: yes

Number of VRFs upgraded: 1 
Router(config)# exit

The following is an example of the single-protocol VRF configuration for VRF vrf1 before you enter the vrf upgrade-cli command to upgrade to a multi-AF multiprotocol VRF configuration:

!

ip vrf vrf1

 rd 1:1

 route-target export 1:1

 route-target import 1:1

interface Loopback1

 ip vrf forwarding vrf1

 ip address 10.3.3.3 255.255.255.255

This is an example of the multi-AF multiprotocol VRF configuration for VRF vrf1 after you enter the vrf upgrade-cli command with the common-policies keyword:

!

vrf definition vrf1

 rd 1:1

 route-target export 1:1

 route-target import 1:1

 !

 address-family ipv4

 exit-address-family

!

interface Loopback1

 vrf forwarding vrf1

 ip address 10.3.3.3 255.255.255.255

Related Commands

Command	Description
show vrf	Displays the defined VRF instances.
vrf definition	Configures a VRF routing table instance and enters VRF configuration mode.
vrf forwarding	Associates a VRF instance with an interface or subinterface.

Feature Information for MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs

Table 3 lists the release history for this feature.

Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

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Note Table 3 lists only the Cisco IOS software release that introduced support for a given feature in a given Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS software release train also support that feature.

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Table 3 Feature Information for MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs 

Feature Name	Releases	Feature Information
MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs	12.2(33)SRB	This document describes how to configure a multiprotocol Virtual Private Network (VPN) routing and forwarding (VRF) instance for IPv4 and IPv6 VPNs and describes how to upgrade your existing single-protocol IPv4-only VRF to a multiprotocol VRF configuration. The MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs feature introduces Cisco IOS command-line interface (CLI) commands that allow you to enable an IPv4 and IPv6 VPN in the same Multiprotocol Label Switching (MPLS) VRF instance and to simplify the migration from a single-protocol VRF configuration to a multiprotocol VRF configuration. In 12.2(33)SRB, this feature was introduced on the Cisco 7600 router. The following sections provide information about this feature: •VRF Concepts Similar for IPv4 and IPv6 VPNs •Single-Protocol VRF to Multiprotocol VRF Migration •Multiprotocol VRF Configurations Characteristics and Examples •Configuring a VRF for IPv4 and IPv6 VPNs •Associating a Multiprotocol VRF with an Interface •Verifying the MPLS VPN—VRF CLI for IPv4 and IPv6 VPNs Configuration •Migrating from a Single-Protocol IPv4-Only VRF to a Multiprotocol VRF Configuration The following commands were introduced or modified by this feature: vrf definition, vrf forwarding, vrf upgrade-cli, and show vrf.

Glossary

6PE—IPv6 provider edge router or a Multiprotocol Label Switching (MPLS) label switch router (LSR) edge router using IPv6.

6VPE—IPv6 Virtual Private Network (VPN) provider edge router.

AF—address family. Set of related communication protocols in which all members use a common addressing mechanism to identify endpoints. Also called protocol family.

AFI—Address Family Identifier. Carries the identity of the network-layer protocol that is associated with the network address.

BGP—Border Gateway Protocol. A routing protocol used between autonomous systems. It is the routing protocol that makes the internet work. BGP is a distance-vector routing protocol that carries connectivity information and an additional set of BGP attributes. These attributes allow for a rich set of policies for deciding the best route to use to reach a given destination. BGP is defined by RFC 1771.

CE—customer edge router. A service provider router that connects to Virtual Private Network (VPN) customer sites.

FIB—Forwarding Information Base. Database that stores information about switching of data packets. A FIB is based on information in the Routing Information Base (RIB). It is the optimal set of selected routes that are installed in the line cards for forwarding.

HA—high availability. High availability is defined as the continuous operation of systems. For a system to be available, all components—including application and database servers, storage devices, and the end-to-end network—need to provide continuous service.

IP—Internet Protocol. Network-layer protocol in the TCP/IP stack offering a connectionless internetwork service. IP provides features for addressing, type-of-service specification, fragmentation and reassembly, and security.

IPv4—IP Version 4. Network layer for the TCP/IP protocol suite. IPv4 is a connectionless, best-effort packet switching protocol.

IPv6—IP Version 6. Replacement for IPv4. IPv6 is a next-generation IP protocol. IPv6 is backward compatible with and designed to fix the shortcomings of IPv4, such as data security and maximum number of user addresses. IPv6 increases the address space from 32 to 128 bits, providing for an unlimited number of networks and systems. It also supports quality of service (QoS) parameters for real-time audio and video.

MFI—MPLS Forwarding Infrastructure. In the Cisco MPLS subsystem, the data structure for storing information about incoming and outgoing labels and associated equivalent packets suitable for labeling.

MPLS—Multiprotocol Label Switching. MPLS is a method for forwarding packets (frames) through a network. It enables routers at the edge of a network to apply labels to packets (frames). ATM switches or existing routers in the network core can switch packets according to the labels with minimal lookup overhead.

PE—provider edge router. A router that is part of a service provider's network and that is connected to a customer edge (CE) router. The PE router function is a combination of an MLS edge label switch router (LSR) function with some additional functions to support Virtual Private Networks (VPNs).

RD (IPv4)—route distinguisher. An 8-byte value that is concatenated with an IPv4 prefix to create a unique VPN IPv4 (VPNv4) prefix.

RD (IPv6)—route distinguisher. A 64-bit value that is prepended to an IPv6 prefix to create a globally unique VPN-IPv6 address.

RIB—Routing Information Base. The set of all available routes from which to choose the Forwarding Information Base (FIB). The RIB essentially contains all routes available for selection. It is the sum of all routes learned by dynamic routing protocols, all directly attached networks (that is. networks to which a given router has interfaces connected), and any additional configured routes, such as static routes.

RT—route target. Extended community attribute used to identify the Virtual Private Network (VPN) routing and forwarding (VRF) routing table into which a prefix is to be imported.

VPN—Virtual Private Network. Enables IP traffic to travel securely over a public TCP/IP network by encrypting all traffic from one network to another. A VPN uses "tunneling" to encrypt all information at the IP level.

VRF—Virtual Private Network (VPN) routing and forwarding instance. A VRF consists of an IP routing table, a derived forwarding table, a set of interfaces that use the forwarding table, and a set of rules and routing protocols that determine what goes into the forwarding table. In general, a VRF includes the routing information that defines a customer VPN site that is attached to a PE router.

VRF table—A routing and a forwarding table associated to a Virtual Private Network (VPN) routing and forwarding (VRF) instance. This is a customer-specific table, enabling the provider edge (PE) router to maintain independent routing states for each customer.

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Note See Internetworking Terms and Acronyms for terms not included in this glossary.

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Any Internet Protocol (IP) addresses used in this document are not intended to be actual addresses. Any examples, command display output, and figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and coincidental.

©2007 Cisco Systems, Inc. All rights reserved.