[j-nsp] MC-LAG on QFX5100

[Jackson, William]

VCF

My experiences with this so far have not been so good……….

So not on the radar at all.

I could use VC but I don’t want the shared control plane.  And MC-LAG “should” be very mature…….


From: Matt Freitag [mailto:mlfreita at mtu.edu]
Sent: Monday, July 10, 2017 1:13 AM
To: Vincent Bernat <bernat at luffy.cx>
Cc: Juniper List <juniper-nsp at puck.nether.net>; Jackson, William <william.jackson at gibtele.com>
Subject: Re: [j-nsp] MC-LAG on QFX5100

Is there something preventing you from using VCF or qfabric?

On Jul 9, 2017 7:25 AM, "Vincent Bernat" <bernat at luffy.cx<mailto:bernat at luffy.cx>> wrote:
 ❦  9 juillet 2017 09:07 GMT, "Jackson, William" <william.jackson at gibtele.com<mailto:william.jackson at gibtele.com>> :

> We have been testing an MC-LAG active/active setup on qfx5100 using the latest 14.1x53 code.
> We are seeing issues when using L3 in the MC-LAG.
> We are using IRB with VRRP on a number of vlans that face the downstream client.
> It seems that in active/active both nodes process traffic even if they
> are not the VRRP master, so we have taken that into account.
>
> The issue we are seeing seems to be that the ARP sync is not working on the ICCP between the peers.
> We can reach downstream nodes via one peer but not the other.
> And it works correctly on some vlans but not others so isn’t related to the downstream client.
>
> JTAC is on it albeit at snail’s pace.
>
> Has anyone got this working on qfx5100 and can share some config
> examples?

I ran into similar limitations with the same version. I have tried both
MAC synchronization and VRRP. When packets hit the "wrong" node (the one
that didn't learn the neighbor information), they are not
forwarded. See:

 https://lists.gt.net/nsp/juniper/60956#60956

I got additional private feedback from people with similar issues
(MC-LAG and L3 forwarding). I didn't try to involve JTAC.
--
Don't stop at one bug.
            - The Elements of Programming Style (Kernighan & Plauger)
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