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

Chapter Description

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 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)

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.


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.


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.


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


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.

no auto-summary

Turns off the auto-summarization feature.

2. EIGRP Manual Summarization / Passive EIGRP Interfaces / Equal-Cost Load Balancing: Maximum Paths / Unequal-Cost Load Balancing: Variance | Next Section