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

[Adam Vitkovsky]

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.

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.

adam


        Adam Vitkovsky
        IP Engineer

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