EIGRP in Broadcast Medium

Unanswered Question
Jan 29th, 2009
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I am confused in a very basic concept. That is..

OSPF uses DR/BDR election in Broadcast medium like LAN

How EIGRP handles this situation. Whether it will create membership with all the Routers in the LAN?

Can you please explain this.


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Giuseppe Larosa Thu, 01/29/2009 - 03:08
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Hello R.B. Kumar,

EIGRP will build adjacencies will all routers in segment.

EIGRP misses a DR concept.

The reason why a single device cannot be a reference for all devices in segment is that EIGRP has some distance vectors features like spit horizon:

a router will not advertise out interface X what has learned from interface X.

For this reason a new router needs to build neighborship with all routers in the lan segment to be sure to get all routing information.

Hope to help


hclisschennai Thu, 01/29/2009 - 06:25
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Hi Giuseppe,

Thankyou. This clarity i found no where in the documents. Thanks again for giving this information




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