Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements
Webcast-Catalyst9k
New Member

OSPF & Secondary Address

Hi ,

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

1 ACCEPTED SOLUTION

Accepted Solutions

Re: OSPF & Secondary Address

Hi

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

regds

4 REPLIES
Cisco Employee

Re: OSPF & Secondary Address

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,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
New Member

Re: OSPF & Secondary Address

Thanks a lot.

Kerem

Re: OSPF & Secondary Address

Hi

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

regds

Re: OSPF & Secondary Address

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

269
Views
10
Helpful
4
Replies
CreatePlease to create content