nanog mailing list archives
Re: Followup British Telecom outage reason
From: Jesper Skriver <jesper () skriver dk>
Date: Tue, 27 Nov 2001 21:03:25 +0100
On Mon, Nov 26, 2001 at 11:51:08AM -0500, Daniel Golding wrote:
This used to be the cc train, then later the S train. However, the S train has never been as stable as cc, and it has become increasingly less stable over time, with too many new features rolling in. I'd be curious as to exactly which CEF bugs bit them. The introduction of greater MPLS functionality seems to have given CEF a nasty bit of destabilization.
Tell me about it, 12000's disabling CEF on LineCards due to various bugs has probably been the biggest problem I've seen over the past year or more. Especially since our IGP (ISIS) doesn't use IP as transport, and thus keep it's adjacencies, and blackhole all traffic recieved on such a LineCard until a human acts :-( But it seems that Cisco has a undocumented, and little know command, that will disable ISIS on interfaces residing on LineCards with CEF disabled, and trigger a reroute around the affected LineCard. router isis external overload signalling Note: We've configured it recently, and hasn't been in a situation where we've seen it in action yet, but Cisco claim that atleast one significant carrier has been using it for months. /Jesper -- Jesper Skriver, jesper(at)skriver(dot)dk - CCIE #5456 Work: Network manager @ AS3292 (Tele Danmark DataNetworks) Private: FreeBSD committer @ AS2109 (A much smaller network ;-) One Unix to rule them all, One Resolver to find them, One IP to bring them all and in the zone to bind them.
Current thread:
- Re: Followup British Telecom outage reason, (continued)
- Re: Followup British Telecom outage reason S (Nov 24)
- RE: Followup British Telecom outage reason Christian Kuhtz (Nov 24)
- Re: Followup British Telecom outage reason Paul Vixie (Nov 25)
- Re: Followup British Telecom outage reason Alex Bligh (Nov 26)
- RE: Followup British Telecom outage reason Christian Kuhtz (Nov 28)
- RE: Followup British Telecom outage reason Patrick Greenwell (Nov 28)
- Re: Followup British Telecom outage reason Peter Galbavy (Nov 30)
- Re: Followup British Telecom outage reason Neil J. McRae (Nov 30)
- RE: Followup British Telecom outage reason Daniel Golding (Nov 26)
- RE: Followup British Telecom outage reason Deepak Jain (Nov 26)
- Re: Followup British Telecom outage reason Jesper Skriver (Nov 27)
- Re: Followup British Telecom outage reason Paul Vixie (Nov 25)
- RE: Followup British Telecom outage reason Christian Kuhtz (Nov 26)
- Re: Followup British Telecom outage reason Valdis . Kletnieks (Nov 26)
- RE: Followup British Telecom outage reason Sean Donelan (Nov 26)
- Re: Followup British Telecom outage reason Ian Duncan (Nov 26)
- RE: Followup British Telecom outage reason Alex Bligh (Nov 26)
- Re: Followup British Telecom outage reason Christopher A. Woodfield (Nov 26)
- Re: Followup British Telecom outage reason jerry scharf (Nov 26)
- Re: Followup British Telecom outage reason Christopher A. Woodfield (Nov 26)
- Re: Followup British Telecom outage reason Brett Frankenberger (Nov 26)