Re: [nsp] EIGRP flapping

From: Stephen Sprunk (ssprunk@cisco.com)
Date: Thu Apr 11 2002 - 15:25:38 EDT


Thus spake "Florin Florian" <florin@Cluj.RoEdu.Net>
> My router communicate with another router over serial link, with EIGRP.
> The problem consist in EIGRP flapping and my backbone interface is up and
> down, frecvently...
>
> Apr 7 12:25:13 router 272: 01:07:26: %LINEPROTO-5-UPDOWN: Line protocol
> on Interface Serial0/1/0, changed state to down
> Apr 7 12:25:14 router 273: 01:07:27: %LINK-3-UPDOWN: Interface
> Serial0/1/0, changed state to up
> Apr 7 12:25:14 router 274: 01:07:28: %LINEPROTO-5-UPDOWN: Line protocol
> on Interface Serial0/1/0, changed state to up
> Apr 7 12:26:02 router 275: 01:08:15: %DUAL-5-NBRCHANGE: IP-EIGRP my AS:
> Neighbor x.x.x.x (Serial0/1/0) is down: peer restarted
> Apr 7 12:26:02 router 276: 01:08:15: %DUAL-5-NBRCHANGE: IP-EIGRP my AS:
> Neighbor x.x.x.x (Serial0/1/0) is up: new adjacency

How do you expect EIGRP to stay up when your line keeps going down? You've
got cause and effect backwards.

> Why not function properly the backbone links with VIP 4-80 with the PA
> 4T and the PA - 1FE ISL???
> This PA 4T function with VIP 2-40

For a start, you're running 12.2(3), and that's not great code, especially
for new hardware like VIP4's. Odds are your problem is fixed in later
versions.

S



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