Table Of Contents

A Commands

address-family (EIGRP)

authentication key-chain (EIGRP)

authentication mode (EIGRP)

autonomous-system

A Commands

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This chapter describes the Cisco NX-OS Enhanced Interior Gateway Routing Protocol (EIGRP) commands that begin with A.

address-family (EIGRP)

To configure an address family for the Enhanced Interior Gateway Routing Protocol (EIGRP), use the address-family command. To remove an address family, use the no form of this command.

address-family ipv4 unicast

no address-family ipv4 unicast

Syntax Description

ipv4	Specifies the IPv4 address family.
unicast	Specifies unicast address support.

Command Default

None

Command Modes

Address-family configuration mode
Router configuration mode

Command History

Release	Modification
6.0(2)N1(1)	This command was introduced.

Usage Guidelines

This command requires the LAN Base Services license.

Examples

This example shows how to set the IPv4 unicast address family for an EIGRP instance:

switch(config)# router eigrp 201 

switch(config-router)# address-family ipv4 unicast

switch(config-router)#

Related Commands

Command	Description
default-information	Controls the distribution of a default route.
default-metric	Configures the default metric for routes redistributed into EIGRP.
distance	Configures the administrative distance.
maximum-paths	Configures the maximum number of equal-cost paths.
redistribute	Configures route redistribution for EIGRP.
router-id	Configures the router ID.
show ip eigrp	Displays EIGRP information.
timers	Configures the EIGRP timers.

authentication key-chain (EIGRP)

To enable authentication for the Enhanced Interior Gateway Routing Protocol (EIGRP) packets and to specify the set of keys that can be used on an interface, use the authentication key-chain command. To prevent authentication, use the no form of this command.

authentication key-chain name-of-chain

no authentication key-chain name-of-chain

Syntax Description

name-of-chain

Group of keys that are valid.

Command Default

No authentication is provided for EIGRP packets.

Command Modes

Address-family configuration mode
Router configuration mode

VRF configuration mode

Command History

Release	Modification
6.0(2)N1(1)	This command was introduced.

Usage Guidelines

Set the authentication mode using the authentication mode command in VRF configuration mode. You must separately configure a key chain using the key-chain command to complete the authentication configuration for an interface.

This command requires the LAN Base Services license.

Examples

This example shows how to configure the interface to accept and send any key that belongs to the key-chain trees:

switch(config)# router eigrp 209

switch(config-router)# vrf red

switch(config-router-vrf)# authentication key-chain trees

Related Commands

Command	Description
authentication mode (EIGRP)	Sets the authentication mode for EIGRP in a VRF.
ip authentication key-chain eigrp	Enables authentication for EIGRP and specifies the set of keys that can be used on an interface.
key-chain	Creates a set of keys that can be used by an authentication method.
show ip eigrp	Displays EIGRP information.

authentication mode (EIGRP)

To specify the type of authentication used in the Enhanced Interior Gateway Routing Protocol (EIGRP) packets, use the authentication mode command. To remove authentication, use the no form of this command.

authentication mode md5

no authentication mode md5

Syntax Description

md5	Specifies Message Digest 5 (MD5) authentication.

Command Default

None

Command Modes

Address-family configuration mode
Router configuration mode

VRF configuration mode

Command History

Release	Modification
6.0(2)N1(1)	This command was introduced.

Usage Guidelines

This command requires the LAN Base Services license.

Examples

This example shows how to configure the interface to use MD5 authentication:

switch(config)# router eigrp 209

switch(config-router)# vrf red

switch(config-router-vrf)# authentication mode md5

switch(config-router-vrf)#

Related Commands

Command	Description
authentication key-chain eigrp	Enables authentication for EIGRP and specifies the set of keys that can be used on an interface.
ip authentication mode eigrp	Configures the authentication mode for EIGRP on an interface.
key chain	Creates a set of keys that can be used by an authentication method.
show ip eigrp	Displays EIGRP information.

autonomous-system

To configure the autonomous system (AS) number for an Enhanced Interior Gateway Routing Protocol (EIGRP) address family, use the autonomous-system command. To revert to default, use the no form of this command.

autonomous-system as-number

no autonomous-system [as-number]

Syntax Description

as-number

Autonomous system number. The range is from 1 to 65535.

Command Default

None

Command Modes

Address-family configuration mode

Command History

Release	Modification
6.0(2)N1(1)	This command was introduced.

Usage Guidelines

Use the autonomous-system command to set a common AS number for all EIGRP instances in an address family.

This command requires the LAN Base Services license.

Examples

This example shows how to set an AS number for EIGRP for IPv4 unicast:

switch(config)# router eigrp 201

switch(config-router)# address-family ipv4 unicast

switch(config-router-af)# autonomous-system 64496

switch(config-router-af)#

Related Commands

Command	Description
address-family (EIGRP)	Enters the address family configuration mode for EIGRP.