[c-nsp] 802.1Q double tag on catalyst 3500 ?

[Tassos Chatzithomaoglou]

If you are referring to 3548XL, then this switch doesn't support 802.1q tunneling.
If you are referring to 3550-48, then you can use "switchport mode dot1q-tunnel" under the port.

--
Tassos


Chris Cappuccio wrote on 2/8/2007 1:28 πμ:
> Hey does anyone know how to pass double tagged packets on cisco 3548s ?
> 
> I have an Adtran TA 3000/SM2 that will generate double tagged packets for
> ADSL2+ customers.  The double tagged packets generated by the TA 3000 are
> received by the 3548 just fine and it will even pass them along other
> vlan trunk ports.
> 
> I wanted to connect a router into a port on the 3548 that would talk with
> only single level vlan tags.  It would send and receive packets with
> just the inner tag and then the 3548 would add/remove the outer tag.  The
> router port config on the catalyst would look like this:
> 
> int f0/27
>  switch access vlan 67
>  mtu 1504
> 
> The trunk ports are mtu 1508 (we also pass some mpls traffic over them)
> 
> I want to allow the device on f0/27 to send tagged packets which the
> 3548 would then add a vlan 67 tag to.  (67 is the outer tag and then i want
> each dsl customer to have their own inner tag)
> 
> Unfortunately it looks like the 3548 simply drops tagged packets on an
> access port.  They never seem to make it back to the adtran.  Any ideas?
> 
> Does anyone else do this sort of thing through this level of catalyst
> switch?
> 
> Chris
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