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CCNA Routing and Switching Portable Command Guide: Enhanced Interior Gateway Routing Protocol (EIGRP)

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The excerpt from The CCNA Routing and Switching Portable Command Guide summarizes all CCNA certification-level Cisco IOS® Software commands, keywords, command arguments, and associated prompts for topics related to the Enhanced Interior Gateway Routing Protocol (EIGRP).

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This chapter is from the book

This chapter provides information and commands concerning the following topics:

  • Configuring Enhanced Interior Gateway Routing Protocol (EIGRP)
  • EIGRP auto-summarization
  • EIGRP manual summarization
  • Passive EIGRP interfaces
  • Equal-cost load balancing: Maximum paths
  • Unequal-cost load balancing: variance
  • Bandwidth use
  • Authentication
  • Verifying EIGRP
  • Troubleshooting EIGRP
  • Configuration example: EIGRP

Configuring Enhanced Interior Gateway Routing Protocol (EIGRP)

Router(config)#router
eigrp 100

Turns on the EIGRP process.

100 is the autonomous system (AS) number, which can be a number between 1 and 65,535.


All routers in the same autonomous system must use the same autonomous system number.

Router(config-router)#network 10.0.0.0

Specifies which network to advertise in EIGRP.

Router(config-if)#bandwidth x

Sets the bandwidth of this interface to x kilobits to allow EIGRP to make a better metric calculation.


NOTE This command is entered at the interface command prompt (config-if) and not in the router process prompt (config-router). The setting can differ for each interface to which it is applied.


TIP The bandwidth command is used for metric calculations only. It does not change interface performance.

Router(config-router)#eigrp log-neighbor-changes

Changes with neighbors will be displayed.

Router(config-router)#no
network 10.0.0.0

Removes the network from the EIGRP process.

Router(config)#no router eigrp 100

Disables routing process 100 and removes the entire EIGRP configuration from the running configuration.

Router(config-router)#network 10.0.0.0 0.255.255.255

Identifies which interfaces or networks to include in EIGRP. Interfaces must be configured with addresses that fall within the wildcard mask range of the network statement. A network mask can also be used here.

Router(config-router)#metric weights tos k1 k2 k3 k4 k5

Changes the default k values used in metric calculation.

These are the default values:

tos=0, k1=1, k2=0, k3=1, k4=0, k5=0

EIGRP Auto-Summarization

Router(config-router)
#
auto-summary

Enables auto-summarization for the EIGRP process.


NOTE The behavior of the auto-summary command is disabled by default of Cisco IOS Software Versions 15 and later. Earlier software generally has automatic summarization enabled by default.

Router(config-router)
#
no auto-summary

Turns off the auto-summarization feature.

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