A new network 172.16.20.0/24 was added on a router in the US. After having some problems getting to other devices on the 172.16.1.0/24 network, the new network was removed. Many routers in the UK still contain this route. Clearing the route on each router doesn't help as they continue to learn it from a neighboring router. We have not able to clear the route on these routers. A traceroute lfrom the US leads to 2 routers and loops between them. Each one says it learned the route from the other one. The only way I could fix it was to block the advertisement with a distribute-list. Any ideas why it wouldn't clear when the route was removed and cleared on the originating router ?
1 ---- 12.1(4), 12.1(7), 12.1(3a)XI5. 2 of them I will have to find out as I don't have pwds, but sho cdp neigh det shows that they are all at least 12.1 or 12.2. 2 ----- not sure what you are looking for. basically we have no auto summ on and the networks and sometimes a distribute list. We don't usually set metrics but I did just find this on one of the routers:
router eigrp 1
default-metric 4096 100 255 1 1500
no eigrp log-neighbor-changes
3 ----- Checked 3 of the routers and none of them have active routes.
sho ip eigrp topo all-links shown here:
P 172.16.20.0/24, 1 successors, FD is 2698752, serno 75499390
via 10.240.215.4 (2698752/2696192), FastEthernet0/0, serno 75482507
Thanks for your help Don. I did look at those caveats, but none seem to accurately identify my problem except maybe 5109 which is very vague. We will probably upgrade to 12.1(18). Unless anyone else has other ideas ?
Keep in mind I just outlined 4 of them that jumped out at me. There were 82 fixes, as stated. I can tell you, running 12.1.7, in a customer network we had major SIA, Summarization, and Routes getting stuck in the topology table issues. We upgraded (12.1.16 at the time) and all was good.
Agreed. The wierd thing is we have many other routers in the US that are at the same or even lower releases of code and we haven't seen this problem here. That's why I'm trying to figure out what is different and/or which router exactly is causing the problem. In our WAN some routers are at 12.1.7 but others that are running 11 code (major core routers where we can't get down time to upgrade, and don't have any issues with)
11 version EIGRP is good to go and stable, although some of the new classless/stub/ SIA Query/ etc type features are not in them. Once the classless support was added in 12.1M there were problems. Good summarization, distribution lists filtering unneeded routes, etc will keep you out of trouble with EIGRP.
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