EIGRP Auto Summarization

Router(config-router)#no auto-summary

Turns off the auto-summarization feature. Networks are summarized at the classful boundary by default

Router(config)#int fa 0/0


Router(config-if)ip summary-address eigrp 100

Enables manual summarization on this specific interface for the given address and mask


EIGRP automatically summarizes networks at the classful boundary. A poorly designed network with discontiguous subnets could have problems with connectivity if the summarization feature is left on. You could have two routers advertise the same network172.16.0.0/16when in fact the intention is for the routers to advertise two different networks172.16.10.0/24 and

Recommended practice is that you turn off automatic summarization, use the ip summary-address command, and summarize manually what you need to.

CCNA Self-Study(c) CCNA Portable Command Guide
CCNA Portable Command Guide
ISBN: 1587201585
EAN: 2147483647
Year: 2006
Pages: 261
Authors: Scott Empson

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