nanog mailing list archives
Re: Best practices IPv4/IPv6 BGP (dual stack)
From: Owen DeLong <owen () delong com>
Date: Fri, 2 May 2014 17:09:54 -0700
On May 2, 2014, at 12:44 PM, Deepak Jain <deepak () ai net> wrote:
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?
Separate v4 and v6 sessions are the best practice. It is possible to have a single-protocol outage in which case you either take out the other protocol unnecessarily or you black-hole traffic.
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.
Mostly true, but implementations vary and YMMV vendor to vendor and in some cases, model and/or software version to model and/or software version. Two sessions always works and unless you are somehow resource-constrained on sessions is really the simplest, easiest to manage, cleanest way to do things.
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?
See above for BCP. As to the rest, in my experience, the answers vary (see above). Owen
Current thread:
- Best practices IPv4/IPv6 BGP (dual stack) Deepak Jain (May 02)
- Re: Best practices IPv4/IPv6 BGP (dual stack) Jared Mauch (May 02)
- Re: Best practices IPv4/IPv6 BGP (dual stack) Chris Grundemann (May 02)
- Re: Best practices IPv4/IPv6 BGP (dual stack) Laszlo Hanyecz (May 02)
- Re: Best practices IPv4/IPv6 BGP (dual stack) Ryan Wilkins (May 02)
- Re: Best practices IPv4/IPv6 BGP (dual stack) Måns Nilsson (May 02)
- Re: Best practices IPv4/IPv6 BGP (dual stack) Owen DeLong (May 02)
- Re: Best practices IPv4/IPv6 BGP (dual stack) Eugeniu Patrascu (May 02)
- Re: Best practices IPv4/IPv6 BGP (dual stack) Paul S. (May 02)
- RE: Best practices IPv4/IPv6 BGP (dual stack) Vitkovský Adam (May 03)
- RE: Best practices IPv4/IPv6 BGP (dual stack) Mikael Abrahamsson (May 03)
- Re: Best practices IPv4/IPv6 BGP (dual stack) Michael Hallgren (May 03)
- Re: Best practices IPv4/IPv6 BGP (dual stack) Mark Tinka (May 04)
- Re: Best practices IPv4/IPv6 BGP (dual stack) Mark Tinka (May 04)
- RE: Best practices IPv4/IPv6 BGP (dual stack) Mikael Abrahamsson (May 03)
- Re: Best practices IPv4/IPv6 BGP (dual stack) Jared Mauch (May 02)