regarding eigrp neibhour relationship on secondary ip address on a interfac

Unanswered Question
Mar 2nd, 2009

regarding eigrp neibhour relationship on secondary ip address on a interface.

Please suggest whether it is possible to have neighbour on secondary ip on interface.

On Cisco site it says no but in one video I saw in one video whether tutor showed that it is possible

I have this problem too.
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Jon Marshall Mon, 03/02/2009 - 04:12

As far as i know it is not possible to have a neighborship on a secondary address with EIGRP. EIGRP does support secondary addresses but the neighborship is always formed on the primary address.

From the EIGRP Q&A -

Q. Does EIGRP support secondary addresses?

A. EIGRP does support secondary addresses. Since EIGRP always sources data packets from the primary address, Cisco recommends that you configure all routers on a particular subnet with primary addresses that belong to the same subnet. Routers do not form EIGRP neighbors over secondary networks. Therefore, if all of the primary IP addresses of routers do not agree, problems can arise with neighbor adjacencies.

Jon

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