[c-nsp] OSPF's handling of secondary IP addresses on subinterfaces

[Wayne Lee]

Sent from my iPad

On 7 Apr 2012, at 03:29, Robert Johnson <fasterfourier at gmail.com> wrote:

> I have a FastEthernet interface with multiple 802.1Q based
> subinterfaces. OSPF properly advertises routes for the subnets
> directly defined on these subinterfaces. However if I add secondary IP
> addresses to these subinterfaces, the subnets defined using the
> secondary command show up in the local routing table as directly
> connected, but OSPF doesn't advertise them to the rest of the area.
> The OSPF process includes network statements that encompass both
> primary and secondary IP addresses and they're all in the same area.
> 
> Are there any limitations I should know about with OSPF on
> subinterfaces with secondary IP addresses?
> 
> IOS 12.4(25) on a 3745.
> 
> Thanks in advance.
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> 

I've seen this happen before. The same box announced the secondary subnet on one subinterface but did not on a another. We do have redist connected subnets enabled.

Regards

Wayne