[62491] in North American Network Operators' Group
Re: .ORG problems this evening
daemon@ATHENA.MIT.EDU (Stephen J. Wilcox)
Thu Sep 18 13:43:03 2003
Date: Thu, 18 Sep 2003 17:28:51 +0000 (GMT)
From: "Stephen J. Wilcox" <steve@telecomplete.co.uk>
To: Todd Vierling <tv@duh.org>
Cc: nanog@merit.edu
In-Reply-To: <Pine.NEB.4.58.0309181250260.8936@server.duh.org>
Errors-To: owner-nanog-outgoing@merit.edu
On Thu, 18 Sep 2003, Todd Vierling wrote:
>
> On Thu, 18 Sep 2003, E.B. Dreger wrote:
>
> : TV> Date: Thu, 18 Sep 2003 10:05:15 -0400 (EDT)
> : TV> From: Todd Vierling
> :
> : TV> DNS site A goes down, but its BGP advertisements are still in
> : TV> effect.
> :
> : Or are they?
>
> I couldn't know for sure from some sites, but traceroutes sure got there.
> That would imply that (at their end) the advertisements were still up.
>
> BGP has no way to know that an internal network problem occurred. If
> someone mistakenly tripped over a network cable that disconnected DNS
> clusters from a router, how would the router know to drop anycast
> advertisements?
>
> (Sure, you could run zebra on the cluster. But what about if the name
> server SEGVs? There's a lot of possible scenarios....)
ALmost there.. just make sure your zebra IGPs are redistributing to your BGP so
that a failure such as that knocks out the bgp too
Steve
