Cisco Systems 78-11741-02 Eigrp Configuration Examples, Route Summarization Example, IPC-273

Configuring EIGRP

EIGRP Configuration Examples

To display various routing statistics, use the following commands in EXEC mode, as needed:

Command	Purpose
Router# show ip eigrp interfaces [interface-type	Displays information about interfaces configured for
interface-number] [as-number]	EIGRP.
Router# show ip eigrp neighbors [interface-typeas-number	Displays the EIGRP discovered neighbors.
static]
Router# show ip eigrp topology [as-number[[ip-address]	Displays the EIGRP topology table for a given
mask]]	process.
Router# show ip eigrp traffic [as-number]	Displays the number of packets sent and received for
	all or a specified EIGRP process.

To enable EIGRP Stub Routing packet debugging, use the following command in privileged EXEC mode:

Command	Purpose
Router# debug eigrp packet stub	Displays debug information about the stub status
	of peer routers.

EIGRP Configuration Examples

This section contains the following examples:

• Route Summarization Example

• Route Authentication Example

• Stub Routing Example

Route Summarization Example

The following example configures route summarization on the interface and also configures the automatic summary feature. This configuration causes EIGRP to summarize network 10.0.0.0 out Ethernet interface 0 only. In addition, this example disables automatic summarization.

interface Ethernet 0

ip summary-address eigrp 1 10.0.0.0 255.0.0.0

!

router eigrp 1 network 172.16.0.0 no auto-summary

Note You should not use the ip summary-address eigrp summarization command to generate the default route (0.0.0.0) from an interface. This causes the creation of an EIGRP summary default route to the null 0 interface with an administrative distance of 5. The low administrative distance of this default route can cause this route to displace default routes learned from other neighbors from the routing table. If the default route learned from the neighbors is displaced by the summary default route, or if the summary route is the only default route present, all traffic destined for the default route will not leave the router,

Cisco IOS IP Configuration Guide

IPC-273