[j-nsp] Q-In-Q using M7i and CISCO Switch

[sthaug at nethelp.no]

>   We have a client with the following situation:
> 
>                            Trunk                   v1, v2, 
> v3                  Trunk
> ----| Switch | --------| Switch |----------------|  Switch|-------- 
> JUNIPER M7i IQ2E ---
>                                                         Trunk
> 
>   Carrier offers only 3 vlans to the client.  But he wants to push/pop some
>   more vlans inside these 3 ones.
> 
>   Is it possible to initiate and finish Q-In-Q vlans using a cisco ME 
> (or EX Series)
>   switches and a JUNIPER M7i with IQ2E interface ?
> 
>   The following link shows stack configuration. It can be used to do
>   Q-In-Q with this situation  ?
> 
> http://www.juniper.com.lv/techpubs/en_US/junos10.0/information-products/topic-collections/config-guide-network-interfaces/id-12155750.html 
> 
> 
> 
>   Someone tries to configure it any time ?

As I answered you on the nanog list:

> You need to differentiate between *terminating* a dual tagged VLAN, and
> the operation of pushing/popping a VLAN tag. M7i with IQ2E kan do either.
> 
> Note that you are *not* guaranteed that a carrier which offers a VLAN
> transport service will automatically handle dual tagged VLANs - this must
> be verified. Note also the obvious MTU implication of a 4 byte additional
> VLAN tag.

You need to be more specific about you want to do...

Steinar Haug, Nethelp consulting, sthaug at nethelp.no