[j-nsp] Double-tagging on EX

[Martin Levin]

Since I'm running 100+ EX32/4200 with QinQ I thought I'd pitch in
here...
 
AFAIK no EX (not 82xx either) can do multiple tag operations in one
operation. We use an MX for this.
 
For this to work you need to put an extra EX between (or several
loopback cables) your normal network which has one port for each remote
site where you ingress single-tagged packets. Or you could use selective
QinQ and decide which inner VLAN tag goes where.
 
Not to mention that your provider need to have an MTU that accepts
larger packets than standard, and in itself doesn't filter QinQ packets
for some reason.

 
---
Martin Levin
IT-strategy & planning
Mölndals stad
>>> 


Från:Chris Kawchuk <juniperdude at gmail.com>
Till:Alexander Frolkin <avf at eldamar.org.uk>
Kopia:<juniper-nsp at puck.nether.net>
Datum:2012-02-22 17:14
Ärende:Re: [j-nsp] Double-tagging on EX
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
> 
> _______________________________________________
> juniper-nsp mailing list juniper-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/juniper-nsp


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