EIGRP router-id importance

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Oct 27th, 2009
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Can someone please explain the importance of the EIGRP RID? I understand the importance of the RID in OSPF and was wondering if it carries as much importance in EIGRP as it does in OSPF. And what are the benefits for setting the EIGRP rid or the negatives if any for not setting the EIGRP RID.


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Overall Rating: 4.8 (6 ratings)
lgijssel Tue, 10/27/2009 - 07:22
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In a good ip network, router-id's are linked to loopbacks.

A loopback never goes down which ensures that the router-id always stays the same.

The larger your network, the more important these things become.

If you want a disadvantage as well: you will have more routes in the routing table.



Giuseppe Larosa Tue, 10/27/2009 - 07:27
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Hello Brandon,

EIGRP router id plays a key role for EIGRP external routes.

EIGRP external routes have a field EIGRP router originator that is filled with EIGRP RID.

if two routers have the same EIGRP RID they will not accept external routes originated by the other one.



Hope to help


Mohamed Sobair Tue, 10/27/2009 - 08:27
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The Eigrp router-id is used on Eigrp external routes to prevent routing loops.



mudasir05 Wed, 08/06/2014 - 08:19
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The importance of eigrp router-id can be explained in another way apart from the fact that it is used to stop external eigrp routes.

Suppose if one of the Eigrp neighbor does not want any one route to be received from his other neighbor neighbor without applying any filtering,then the best way is to use the same subnet number as its eigrp router id.This way if earlier it was receiving that external Eigrp route,however now that same route will disappear in its routing table.



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