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Old 12-26-2011, 09:51 PM
ciscodaze ciscodaze is offline
 
Join Date: Dec 2010
Location: Left Coast, California
Posts: 306
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Quote:
Originally Posted by ciscodaze View Post
I dont have the book Mikey, so I may be lacking details, but Im getting the same result.

I have a loopback of 172.16.50.1/32 and the other routing tables give me an OSPF and EIGRP route of /32 and /24, respectively (with eigrp auto-summary on, or off, same result). Both protocols ON at the same time.


I think you figured it out.
whoops, my mistake. I mistakenly advertised 172.16.50.1 as a /24 for eigrp...once I changed it to /32, like the 172.16.50.1/32 for ospf, then turned off eigrp, ospf popped in (whereas it was not there before).

moral of the story: what you see in the routing table when running more than one protocol depends on the masks you use when doing your network statements (or, what gets advertised to that router from outside).

The reason I saw routes for both routing protocols the first time (maybe why you did too) is that they were both valid, with the ospf /32 being more specific. So they both get installed -- even though eigrp wins (normally) with the AD of 90, ospf got installed with it because it had a more specific route (longest match rule).

Once I gave them both /32, the AD tie-breaker kicked in and knocked ospf out, (until eigrp got turned off, allowing the ospf route to be installed as the best route).

edit: looking at your output, thats exactly what happened:

D 172.16.50.0/24 [90/2809856] via 172.16.20.2, 00:48:52, Serial0/0
O 172.16.50.1/32 [110/129] via 172.16.20.2, 00:18:53, Serial0/0
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Last edited by ciscodaze; 12-27-2011 at 08:56 PM.
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