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

[Adam Vitkovsky]

> Phil Mayers
> Sent: Friday, February 05, 2016 4:43 PM
>
> On 05/02/16 14:40, Adam Vitkovsky wrote:
>
> > -that's the only occasion the internet where NDP and MC-LAG in listed
> > the same sentence, which is not a good sign on its own. But no
> > explanation about how it is done, especially the part about how the ND
> > Cache is maintained between the LAG members, which clearly is what is
> > not happening in your case.
>
> I must be missing something - why would a LAG of any type do any special
> processing of ND (or ARP, for that matter) traffic? All it has to do is forward
> the reply appropriately e.g. across the MC-LAG control link if the dest MAC is
> the peer switch or multi/broadcast.
>
> Obviously if you're doing some sort of active-active L3 forwarding on top of
> the MC-LAG then special things need to happen - but did OP say that?
>
> Or is there some subtlety (dumb-lety?) about the way Juniper do this?
>
Hmm good point Phil,
And that would require L2 link between the QFX switches.
In that case the NS would have been flooded say from QFX1 to server as well as from QFX1 to QFX2 to server.
And the NA would be switched using QFX1's MAC address so whichever link is the NA hashed to it should find its way back to QFX1.
Also I assumed it's active/active setup.

Karl,
Can you please share the related config of the two QFX switches?


adam





        Adam Vitkovsky
        IP Engineer

T:      0333 006 5936
E:      Adam.Vitkovsky at gamma.co.uk
W:      www.gamma.co.uk

This is an email from Gamma Telecom Ltd, trading as “Gamma”. The contents of this email are confidential to the ordinary user of the email address to which it was addressed. This email is not intended to create any legal relationship. No one else may place any reliance upon it, or copy or forward all or any of it in any form (unless otherwise notified). If you receive this email in error, please accept our apologies, we would be obliged if you would telephone our postmaster on +44 (0) 808 178 9652 or email postmaster at gamma.co.uk

Gamma Telecom Limited, a company incorporated in England and Wales, with limited liability, with registered number 04340834, and whose registered office is at 5 Fleet Place London EC4M 7RD and whose principal place of business is at Kings House, Kings Road West, Newbury, Berkshire, RG14 5BY.