[j-nsp] Double-tagging on EX

Chris Kawchuk juniperdude at gmail.com
Wed Feb 22 11:12:29 EST 2012

You're out of luck.

There's no way I've found to come in untagged and leave double-tagged; due to the EX's inability to handle 2 label operations per port. Same reason you can't support LDP MPLS L2CKT's (double-label) Martini CCCs, but you can support RSVP MPLS (single label) Kopella CCC's on the EX. (Someone pls. correct me here if I'm wrong!)

The only way is to come in untagged on ge-0/0/0, leave (single) tagged on ge-0/0/1, to a loopback/wrap-around cable connected back into ge-0/0/2 (which is now an incoming single tag), and leaving ge-0/0/3 (double tagged) by using the QinQ access-port option on ge-0/0/2 access -> ge-0/0/3 trunk.

Fun times.

Your mileage may vary on the EX8xxx series, since I believe those devices do support 2-label operations on a port.

- CK.

On 2012-02-22, at 11:20 PM, Alexander Frolkin wrote:

> Hi,
> We need to double-tag packets on an EX4200, i.e., untagged packets come
> in on one interface, and packets with two VLAN tags come out of another
> interface.  So far, everything we tried has failed.  Has anyone figured
> out how to do this?
> Juniper documentation is useless, as always.
> Thanks!
> Alex
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