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EIGRP

Chapter Description

In this sample chapter from CCNP Enterprise Advanced Routing ENARSI 300-410 Official Cert Guide, explore Enhanced Interior Gateway Routing Protocol (EIGRP) fundamentals, configuration models, and path metric calculations.

Use the Command Reference to Check Your Memory

This section includes the most important configuration and verification commands covered in this chapter. It might not be necessary to memorize the complete syntax of every command, but you should be able to remember the basic keywords that are needed.

To test your memory of the commands, cover the right side of Table 2-9 with a piece of paper, read the description on the left side, and then see how much of the command you can remember.

Table 2-9 Command Reference

Task

Command Syntax

Initialize EIGRP in classic configuration

router eigrp as-number

network network mask

Initialize EIGRP in named mode configuration

router eigrp process-name

address-family {ipv4| ipv6} {unicast | vrf vrf-name} autonomous-system as-number

network network mask

Define the EIGRP router ID

eigrp router-id router-id

Configure an EIGRP-enabled interface to prevent neighbor adjacencies

Classic: (EIGRP Process)

passive-interface interface-id

Named Mode: af-interface {default | interface-id}

passive-interface

Configure a keychain for EIGRP MD5 authentication

key chain key-chain-name

key key-number

key-string password

Configure MD5 authentication for an EIGRP interface

Classic: (EIGRP Process)

ip authentication key-chain eigrp as-number key-chain-name

ip authentication mode eigrp as-number md5

Named Mode: af-interface {default | interface-id}

authentication key-chain eigrp key-chain-name

authentication mode md5

Configure SHA authentication for EIGRP named mode interfaces

Named Mode: af-interface {default | interface-id}

authentication mode hmac-sha-256 password

Modify the interface delay for an interface

delay tens-of-microseconds

Modify the EIGRP K values

metric weights TOS K1 K2 K3 K4 K5 [K6]

Modify the default number of EIGRP maximum paths that can be installed into the RIB

maximum-paths maximum-paths

Modify the EIGRP variance multiplier for unequal-cost load balancing

variance multiplier

Display the EIGRP-enabled interfaces

show ip eigrp interface [{interface-id [detail] | detail}]

Display the EIGRP topology table

show ip eigrp topology [all-links]

Display the configured EIGRP keychains and passwords

show key chain

Display the IP routing protocol information configured on the router

show ip protocols

The ENARSI 300-410 exam focuses on practical, hands-on skills that are used by a networking professional. Therefore, you should be able to identify the commands needed to configure, verify, and troubleshoot the topics covered in this chapter.

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