Juniper <-> Cisco IPv6 BGP peering

Vicky Shrestha vicky at
Thu Dec 8 07:47:22 UTC 2011

Hash: SHA1

On Dec 7, 2011, at 4:53 PM, Randy Carpenter wrote:

> Tried that. I agree with others that it is an NDP issue. NDP for the GUA is fine, but just not for the link local. Is there something that would block only link local by default?

We faced a problem with Cisco routers where it will have partial reachability over IPv6, in the same LAN. Looking further, We found that it was having problem with Neighbor solicitations.

The solution then was to remove the IPv6 configs from the interface and putting them back. This problem was quite unpredictable and we were unable to reproduce.

> I should add that I have another uplink to a different provider that works perfectly. The other end is Juniper for that one.
> -Randy
> On Dec 7, 2011, at 17:53, Peter Rubenstein <peter216 at> wrote:
>> Try setting local-address in the bgp neighbor config on the Juniper side?
>> --Peter
>> On Dec 7, 2011, at 4:54 PM, Randy Carpenter <rcarpen at> wrote:
>>> Does anyone have any suggestions on setting up BGP peering between Juniper (SRX) and Cisco?
>>> I successfully have cisco-cisco and juniper-juniper without problems.
>>> When I am trying to peer to one of my upstreams (who has cisco) with my Juniper SRX, They are seeing the link-local address as the next-hop, but are unable to get an ND entry for it, and thus cannot forward traffic to me.
>>> -Randy
>>> --
>>> | Randy Carpenter
>>> | Vice President - IT Services
>>> | Red Hat Certified Engineer
>>> | First Network Group, Inc.
>>> | (800)578-6381, Opt. 1
>>> ----


Vicky Shrestha

Version: GnuPG v1.4.8 (Darwin)


More information about the NANOG mailing list