Layer 2 QOS COS marking on Inbound

Hi Group.

On the Cisco switches (2960) can I apply layer 2 COS marking inbound on a
Dot1q trunk, or can it be applied outbound only?

I understand when a Frame comes inbound on a Trunk, the Vlan tag is removed,
so dot1p cos cannot be applied.

On the outbound, the VLAN tag is added on a trunk and 802.1p COS value can
be attached to the frame.

Is this understand correct.

 However, I have seen mls qos cos <value> override, applied on voice vlans
on phone ports so not sure if the cos is written to the frame and classified
before the vlan tag is removed on the inbound.

 Please can someone correct my understanding?

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Received on Mon Jul 18 2011 - 07:58:22 ART