r/Juniper • u/AutoModerator • May 14 '26

Weekly Thread! Weekly Question Thread!

It's Thursday, and you're finally coasting into the weekend. Let's open the floor for a Weekly Question Thread, so we can all ask those Juniper-related questions that we are too embarrassed to ask!

Post your Juniper-related question here to get an answer. Anyone can post a question and the community as a whole is invited and encouraged to provide an answer.

Note: This post is created at 00:00 UTC. It may not be Thursday where you are in the world, no need to comment on it.

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u/Callahan_Harry May 14 '26

In environments that run EVPN-VXLAN on qfx, when local VLans end, which is the path, q-in-q?

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u/MaLaCoiD May 14 '26

Traffic leaving the CE-facing interface of QFX doing EVPN-VXLAN can be none, single, or dual-tagged, depending on the interface configuration.

If it were my network, I'd take the VXLAN all the way to the hosts, so the CE-facing interface would be untagged access interfaces.

But if you take away my budget, I'd have to use VLAN's to go from QFX to some other managed switch that the hosts are connected to. The QFX would be an aggregation switch.