05-18-2009 12:27 AM - edited 03-13-2019 06:21 PM
Hi,
As you all know, it's possible to override 802.1p/CoS field coming from PC attached to Catalyst switch.
This is accomplished in 2 (two) ways:
- either by '(config-if)# mls qos trust extend cos <value>'
- or via '(config-if)# switchport priority extend cos <value>'
But what about to make Cisco IP Phone to trust PC's DSCP marking ? Is this possible ?
P.S.
Can you also explain, why there 2 (two) flavors of CLI to allow switch to trust to PC's 802.1p marking ?
Thanks.
05-18-2009 12:30 AM
Sorry for mistyping.
I mean, the PC of course attached to Cisco IP PHone which in turn attached to Cisco Catalyst switch.
05-18-2009 06:19 PM
Tobi,
the PC basically send untagged frames to the switch, these will normally be send as CoS=0.
the following link has some scenarios for you
I think you will find example 6 usefull
05-29-2009 11:57 AM
Tobi -
I believe there are two versions of the command for the 2 types of switches: pure layer 2 switches, and multi-layer switches.
2900 series being a pure layer 2 switch, 4500/6500 being a multi-layer switch.
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