QinQ

[lichuan liu]

3550-middleswitch-7609

vlan on 3550 and middleswitch conflict,  can i config QinQ in middleswitch to passthrough  vlans on 3550 to 7609 transparently

thank you!

Tom

[cadet alain]

Hi,

I think QinQ must be configured on the edge switches, not the middle one.

Regards.

Alain.

[Marius Gunnerud]

I would disagree, The middle switch would be the one that needs the configurations. If the middle switch supports Q in Q then yes it is possible to configure it. Also you should tag the native vlan on the 3550 and 7609 otherwise traffic on the native vlan will not be tunneled through the middle switch. something like the following would do the trick using vlan 99 to tunnel the traffic:

Middle Switch

int g0/1

description CONNECTS TO 3550

switchport access vlan 99

switchport mode dot1q-tunnel

int g0/2

description CONNECTS TO 7609

switchport access vlan 99

switchport mode dot1q-tunnel

3550 and 7609

enable

conf t

int g0/1

description INTERFACE CONNECTING TO MIDDLE SWITCH

switchport trunk native vlan tag