Summarization with EIGRP

Jan 20, 2008 3 Replies

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dennis 18 years ago

Hi all,

currently I have build a new network design with EIGRP. This ws a migration from a flat layer 2 to a full routed network. The routing protokoll is now EIGRP. There is a traditionell hirachy with a core - distribution and access layer. Right now I there are several static routes configured on both core switches. Now I would like to send only summaries from the static routes and the transfer ip ranges to the distribution and access switches.

What is the best practice to appear this routes as summary in the routing table with EIGRP?

greetz dennis

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Merv 18 years ago

see Cisco doc "How to configure a summary aggregate address for a specified interface using EIGRP"

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Greg 18 years ago

I do this all of time. Create multiple VLANs behind a /16 boundary. Here is an example.

int vlan 10 ip address 10.1.1.0 255.255.255.0 ! int vlan 11 ip address 10.1.2.0 255.255.255.0 ! int vlan 12 ip address 10.1.3.0 255.255.255.0 ! int vlan 10 ip address 10.1.4.0 255.255.255.0 ! int vlan 10 ip address 10.1.5.0 255.255.255.0

router eigrp 100 no auto-summ network 10.0.0.0 ! Then on the egress interface you want to send a summary route. ip summary-route eigrp 100 10.1.0.0 255.255.0.0. This is a great method to trim the size of your routing tables, it also keeps reconvergence to a minimum.

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Merv 18 years ago

Also the OP should ensure the EIGRP stub routing feature is implemeneted on all access routers to reduce the EIGRP query boundary

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