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Community Member

EIGRP Question

Hi ppl,

2 routers running eigrp, during their initial startup (after neighbor discovery)What will both routers send to each other? a topology table or a routing table?If is a topology table then both routers will contain each router's feasible successor as well? Any good reference for case study?

thanks!

2 REPLIES
Community Member

Re: EIGRP Question

You question is taken care for the following

Enhanced Interior Gateway Routing Protocol

http://www.cisco.com/warp/public/103/eigrp-toc.html

"Building the Topology Table"

Now that these routers are talking to each other, what are they talking about? Their topology tables, of course!

The topology table contains the information needed to build a set of distances and vectors to each reachable network, including:

-lowest bandwidth on the path to this destination as reported by the upstream neighbor

-total delay

-path reliability

-path loading

-minimum path maximum transmission unit (MTU)

-feasible distance

-reported distance

-route source (external routes are marked)

-------------

As you can see, after two routers became neighbors (show ip eigrp neigh)they will start exchange information and store it on the topological database (show ip eigrp topo ) and includes all information.

=) Have fun

guSo

Gold

Re: EIGRP Question

The successor only for each entry from the topology table, minus entries removed for split horizon. As each route is received, the receiving router will reply with a poison reverse, which means the same route with the metric set to infinity.

The metrics are sent as components, rather than the "vector metric."

Hope that helps...

:-)

Russ.W

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