[c-nsp] running ip default statements w/ ospf.

[virendra rode //]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi,


Oliver Boehmer (oboehmer) wrote:
> virendra rode // <> wrote on Monday, November 12, 2007 5:53 PM:
> 
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA1
>>
>> hi,
>>
>> Just wondering if anyone can shed any light into my confusion.
>>
>> In looking at a c4506 switch which has ospf running with ip
>> default-network 0.0.0.0 / ip default-gateway statements. Not sure the
>> reason for these statements when there's routing enabled. I also
>> understand that these statements will route packets when there's no
>> exact match in the routing table. Also the default route announced
>> using the ip default-network command is not propagated by ospf.
>>
>> Anyway, so being part of maintenance, I reconfigured the switch from
>> area 2 to area 0 with its existing configuration and right after that
>> I lost its default route even after the LSA was propagated between
>> neighbors. 
>>
>> So the first thing I did was to clear the routes include ospf database
>> and the default route appeared back, then about a minute I lost the
>> default route again. So this time I removed the ip default statements
>> which didn't make sense to begin with and this time my default route
>> was restored/stable.
>>
>> So I jumped onto others switches and noticed they were running ospf
>> with the ip default statements w/o any problems?
> 
> Hmm, looks like a bug to me. You don't need "ip default-network" with
> OSPF if you carry 0.0.0.0/0 in OSPF, I'm considering this as a legacy
> command which shouldn't be needed in many networks.
> 
> "ip default-gateway" is only applicable whith "no ip routing" (or for
> some platform's boot loader when booting from the network).
> 
> 	oli
> 
- --------------------------
It also has an ip default-gateway statement which I believe is classfull.


regards,
/virendra

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.2.2 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iD8DBQFHObRIpbZvCIJx1bcRAntVAJ496fLrOqC/Iawrjg3ngbWUcoE53wCfRfS5
helI7d5RVakSrT8bkULMlvg=
=4/b6
-----END PGP SIGNATURE-----