[j-nsp] QFX mc-lag and v6 ND

[Karl Brumund]

Thanks Adam.

On Fri, Feb 5, 2016 at 3:46 AM, Adam Vitkovsky <Adam.Vitkovsky at gamma.co.uk>
wrote:

> Hello Karl,
>
> > Karl Brumund
> > Sent: Thursday, February 04, 2016 8:56 PM
> >
> > We're seeing an issue with a pair of QFX3500s, configured with MC-LAG
> > towards servers and IPv6 Neighbor Discovery.
> > qfx1 and qfx2 have mc-ae towards servers. If qfx1 sends NS, a server may
> > reply on the bonded mc-ae towards qfx2 (depending on which NIC it hashes
> > to). qfx1 never gets the NA and times out the neighbor.
> > J documentation only seems to mention NDP and MC-LAG for EX9200s in
> > 15.1.
> >
> > Anybody else seen this, or got a hint to toss our way?
> >
> > Thanks!
> > ...karl
> Was able to find this:
>
>
> http://www.juniper.net/techpubs/en_US/junos14.2/topics/concept/interfaces-active-active-bridging-and-vrrp-over-irb-mx.html
>
> Junos OS supports active-active MC-LAGs by using VRRP over IRB. Junos OS
> also supports active-active MC-LAGs by using IRB MAC address
> synchronization. You must configure IRB using the same IP address across
> MC-LAG peers. IRB MAC synchronization is supported on 32-bit interfaces and
> interoperates with earlier MPC and MIC releases.
>
> We're using VRRP over IRB.


> What is interesting though is I can't find anything related to how the
> heck should NDP work over MC-LAG
> If anyone knows of any documentation please let me know.
>
> Only this, which is leading me to believe again that MC-LAG is evil, at
least on QFX.
http://www.juniper.net/techpubs/en_US/junos15.1/topics/concept/ipv6-neighbor-discovery-switches.html
EX9200 and 15.1

...karl

adam
>
>
>         Adam Vitkovsky
>         IP Engineer
>
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> E:      Adam.Vitkovsky at gamma.co.uk
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