[c-nsp] Does IOS-XR support exchange of IPv6 prefixes over an IPv4BGP peering

[Tassos Chatzithomaoglou]

Thank you for the answer Arie,

It still sounds quite weird to me. Nevertheless,, i'll give it a try in 
a few hours.

Questions:
If there are no IPv6 prefixes to be exchanged, where and how will next 
hop be used?
I thought BGP session setup was independent of the actual prefixes that 
are about to be exchanged.
Does IOS-XR forbid the exchange of capabilities in advance?

--
Tassos


Arie Vayner (avayner) wrote on 05/05/2011 23:05:
> Tassos,
>
> It is supported. I just replicated your issue in a lab, and fixed it
> (took a peek at your case with TAC, so cheating a bit...)
>
> You need to enable IPv6 on the interface which would be used as the next
> hop, otherwise, how do you expect to be able to have the IPv6 AF
> enabled...
> It's a bit weird to me as well, but as soon as I configured an IPv6
> address on the interface, the session came up and all started to work.
>
> Arie
>
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Tassos
> Chatzithomaoglou
> Sent: Wednesday, May 04, 2011 22:00
> To: cisco-nsp
> Subject: [c-nsp] Does IOS-XR support exchange of IPv6 prefixes over an
> IPv4BGP peering
>
> Can someone verify whether it's possible to exchange IPv6 prefixes over
> an IPv4 BGP peering in IOS-XR?
>
>
>
> According to an old doc in
> http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.3/conversion/referenc
> e/guide/cn33main.html#wp1028960
>
> *Note *A given address family is only supported with a neighbor whose
> address is from that address family. For instance, IPv4 neighbors
> support IPv4 unicast and multicast address families, and IPv6 neighbors
> support IPv6 unicast and multicast address families. However, you cannot
>
> exchange IPv6 routing information with an IPv4 neighbor and vice versa.
>
>
>
> --
> Tassos
>
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