Differentiating between 802.1q and 802.1ad frames

[ajsouthard]

Does anyone know how to set up a qos policy that can classify based on whether an incoming frame is 802.1q (single tagged) or 802.1ad (double tagged) on an ME3400E?

[Bastien Migette]

You can match an inner VLAN in a class-map:

http://www.cisco.com/en/US/docs/switches/metro/me3400e/software/release/12.2_53_se/configuration/QoS_QinQ.html#wp1017841

I hope this'll help.

[ajsouthard]

Thanks a lot for your suggestion.

I have played around with this feature and unfortunately it looks like the ingress interface has to be configured as a dot1q tunnel in order for the match inner vlan option to work. We want the interface to be a plain 802.1q trunk interface. Also, to use this feature we would have to know the vlan numbers and match on each one. In our environment the interface will be a UNI to a customer so we will not know (or want to know) the inner vlans being used.