[171493] in North American Network Operators' Group
Re: Best practices IPv4/IPv6 BGP (dual stack)
daemon@ATHENA.MIT.EDU (Ryan Wilkins)
Fri May 2 16:21:19 2014
X-Original-To: nanog@nanog.org
From: Ryan Wilkins <ryan@deadfrog.net>
In-Reply-To: <ACBC2840-DC81-4D7F-8862-F356FAD88EED@heliacal.net>
Date: Fri, 2 May 2014 16:21:09 -0400
To: Deepak Jain <deepak@ai.net>
Cc: NANOG <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
>=20
> Between peering routers on a dual-stacked network, is it considered =
best practices to have two BGP sessions (one for v4 and one for v6) =
between them? Or is it better to put v4 in the v6 session or v6 in the =
v4 session?
>=20
> According to docs, obviously all of these are supported and if both =
sides are dual stacked, even the next-hops don't need to be overwritten.
>=20
> Is there any community-approach to best practices here? Any FIB =
weirdness (e.g. IPv4 routes suddenly start sucking up IPv6 TCAM space, =
etc) that results with one solution over the other?
>=20
> Thanks in advance,
>=20
> DJ
For what it=92s worth, my AboveNet and Cogent BGP peerings are v4 for v4 =
routes and v6 for v6 routes. Two separate sessions to each carrier.
While I don=92t have any BGP speaking IPv6 customers yet, I would set up =
this same way to keep the two protocols apart from each other.
Best,
Ryan Wilkins
