[119218] in North American Network Operators' Group
Re: about interdomain multipath routing.
daemon@ATHENA.MIT.EDU (Jack Bates)
Mon Nov 9 23:19:22 2009
Date: Mon, 09 Nov 2009 22:16:38 -0600
From: Jack Bates <jbates@brightok.net>
To: Matthew Petach <mpetach@netflight.com>
In-Reply-To: <63ac96a50911091950t719a3267lfc1c289d97ce5216@mail.gmail.com>
Cc: Bin Dai <bin.danieldai@gmail.com>, nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Matthew Petach wrote:
>
> I've outlawed the use of multihop eBGP for load-sharing here; when we get
> multiple links off the same router to a peer or upstream, they are configured
> with multipath. We've got hundreds of BGP sessions across the network
> configured with multipath on them.
>
Same here for my connections, though some of my customers are stuck with
multihop eBGP in certain remote areas, but that's a completely different
scenario (single link, but obsolete equipment) and out of my control.
I much prefer multipath, especially given that the standard multihop
config uses static routing and there are conditions that could cause the
flap of the eBGP session during a single link outage. With Multipath,
only the effected path goes down, as it should.
Jack
