Best practices IPv4/IPv6 BGP (dual stack)

Eugeniu Patrascu eugen at
Sat May 3 06:01:52 UTC 2014

On Fri, May 2, 2014 at 10:44 PM, Deepak Jain <deepak at> 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?
> 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.
I've done it separately. IPv4 with IPv4, IPv6 with IPv6. From my point of
view it's a cleaner configuration to have things decoupled completely:
management, debugging.

> 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?
None that I've noticed.

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