[c-nsp] IEEE 802.1P QoS Issue........

[Lukas Tribus]

> The 802.1p bits are carried in the 802.1Q tag

Yes, but ...



> , so you would have to mark  on the physical interface,
> not the subinterface.

Not so true. Just because you are on a subinterface, doesn't mean
you can't set cos values.

Yes, the COS field isn't theoretically "visible" if you strip the
dot1q header from the packet on the wire, however that
doesn't mean the information can't propagate through the
stack anyway.

"qos-groups" are available on a lot of platforms, which is
an internal/local QoS parameter that you can't see on the wire,
yet you still can set it on ingress and match on egress.
Because it propagates through the stack/fabric, just as COS
does.


Of course, certain platforms may be unable to set COS in
this situation, but thats a specific limitation then.


(setting COS on a subif works just fine on a ISR G2 for example).


Lukas