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. [image: photo] *Zach Bare* Network Engineer, KINBER 717-963-7490 <717-963-7490?utm_source=WiseStamp&utm_medium=email&utm_term=&utm_content=&utm_campaign=signature> | 717-977-0769 <717-977-0769?utm_source=WiseStamp&utm_medium=email&utm_term=&utm_content=&utm_campaign=signature> | [email protected] | 5775 Allentown Blvd., Suite 101, Harrisburg, PA 17112 <https://www.facebook.com/Keystone-Initiative-for-Network-Based-Education-and-Research-188743104566075/?utm_source=WiseStamp&utm_medium=email&utm_term=&utm_content=&utm_campaign=signature> <http://www.twitter.com/kinber?utm_source=WiseStamp&utm_medium=email&utm_term=&utm_content=&utm_campaign=signature> <https://www.linkedin.com/company/kinber-keystone-initiative-for-network-based-education-and-research-?utm_source=WiseStamp&utm_medium=email&utm_term=&utm_content=&utm_campaign=signature> <https://vimeo.com/kinber/videos?utm_source=WiseStamp&utm_medium=email&utm_term=&utm_content=&utm_campaign=signature> Register today for KINBERCON 2017 in Pittsburgh April 3-5, 2017! <http://kinbercon.org?utm_source=WiseStamp&utm_medium=email&utm_term=&utm_content=&utm_campaign=signature> On Fri, Mar 17, 2017 at 5:05 PM, Alain Hebert <[email protected]> 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 [email protected] > PubNIX Inc. > 50 boul. St-Charles > P.O. Box 26770 Beaconsfield, Quebec H9W 6G7 > Tel: 514-990-5911 http://www.pubnix.net Fax: 514-990-9443 > > _______________________________________________ > juniper-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/juniper-nsp > _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
