Dears,
i m proposing an isr router to an isp and they are asking that it must supports Q in Q tunneling ,, i m not sure on isr routers does they support Q in Q.
i have seen many configuration on the internet but everywhere i see it is the switch that is needed on the service provider end and the command is as below and it is connected to the router by sub interface dot1.q ,
SW1(config-if)#switchport mode dot1q-tunnel
Please see the picture attached for Qin Q
