[j-nsp] QFX 5100 Q-in_Q + mac rewrite in the same switch or VCF

[Zach Bare]

Alain,

Through my own research on a similar issue, I have found that layer2
protocol packets (in your case PVST+) don't get encapsulated in the same
way that standard packets within a vlan get encapsulated when dealing with
Q-in-Q.

Take a look at this:
https://www.juniper.net/techpubs/en_US/junos12.3/topics/task/configuration/l2pt-qfx-series-cli.html

You'll want to make sure you have 'layer2-protocol-tunneling' enabled for
the outer vlan along the circuit path.

I also found this documentation (although for EX series) as helpful in
understanding what is going on:
https://www.juniper.net/techpubs/en_US/junos/topics/concept/l2pt-ex-series.html

Hope this helps in some way.



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*Zach Bare*
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On Fri, Mar 17, 2017 at 5:05 PM, Alain Hebert <ahebert at pubnix.net> wrote:

>     Well, with 14.1X53.D40.8
>
>     For some reason it strip VLANs from PVST+ frames.
>
>     We captured the output from a Cisco ME3400 which has the VLAN,
>
>     And when we capture on the other end of the QFX everything is right
> BUT for PVST+ packets which lose their encap.
>
>     Curious bug...
>
> --
> -----
> Alain Hebert                                ahebert at pubnix.net
> PubNIX Inc.
> 50 boul. St-Charles
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