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

[Robert Johnson]

Yes, I'm actually seeing one subinterface with a secondary address
have both the primary and secondary address subnets advertised into
OSPF and another have only the primary advertised. Very strange.
Suppose it's worth trying redistribute connected... thanks for the
tip.

Is this expected behavior or a bug?


On Sat, Apr 7, 2012 at 5:30 PM, Wayne Lee <linkconnect at googlemail.com> wrote:
>
>
> 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
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