OSPF & Secondary Address

[Kerem Gursu]

Hi ,

Is it possible to announce within OSPF the seocndary address on any interface

[Harold Ritter]

Absolutely. As long as you have a network statement covering the secondary address.

One thing to bear in mind though is that IOS will not form an adjacency based on a secondary address.

Hope this helps,

[Kerem Gursu]

Thanks a lot.

Kerem

[spremkumar · Accepted solution]

Hi

if you are trying to form adjacency with the secondary ip address (network) then its not possible to have the adjacency.

regds

[devang_etcom]

if any, with secondary addresses occur mainly in conjunction with routing protocols, such as OSPF, which cannot establish adjacencies on secondary addresses. Other than that, you can add as many as the software allows you to. I guess the reason why multiple secondary addresses are being used, rather than multiple logical interfaces, is that you do not have to bother with trunking, inter-VLAN routing etc. when using secondary addressing. It is just a simple way of being able to add more hosts. I would be careful, though, to not add to many hosts, since that, and especially with regard to VoIP, can cause problems with delay and dropped packets, which VoIP usually doesn't handle very well.

rate the post if it hleps

regards

Devang