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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: C&W Outage, more info, sort of
Sorry for this late followup. This thread was just brought to my
attention.
> Sounds like the cisco bug which has affected several different providers
> over the last month or so. A route (almost always a high-interest
> destination) doesn't get added to the forwarding table correctly.
Not true. The fact that none of my colleagues, the isp team, and I
was contacted/involved seems to suggest these routers do not run
Cisco IOS.
-- Enke
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Re: C&W Outage, more info, sort of
To: [email protected]
Subject: Re: C&W Outage, more info, sort of
From: Sean Donelan <[email protected]>
Date: Thu, 3 Jun 1999 14:12:37 -0500
Delivered-To: [email protected]
Sender: [email protected]
[email protected] (John M. Brown) writes:
>It seems that 2 of C&W's core routers in SFO had BGP session problems
>and they cleared the sessions and everything was ok... Its a "level
>two issue" at this time and the ticket is still open. L2 folks are
>looking into the problem to try and figure out what happened.
>
>From our perspective we had no conectivity to NetScape or Yahoo via
>the C&W link.
Sounds like the cisco bug which has affected several different providers
over the last month or so. A route (almost always a high-interest
destination) doesn't get added to the forwarding table correctly.
Nothing appears wrong at the router, but traffic between individual
destinations dies. Unless a customer calls, the provider may not even
notice, because it only affects traffic on a particular path through the
network. A quick temporary solution is clearing the route table. The
router usually builds a fresh route table with the correct forwarding
information. And it appears to work until some event tickles the bug
later. So far this problem manifest itself only with certain IOS versions
using CEF.
--
Sean Donelan, Data Research Associates, Inc, St. Louis, MO
Affiliation given for identification not representation
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