From: Joseph Brunner (joe@affirmedsystems.com)
Date: Sun Aug 24 2008 - 17:27:28 ART
int f0/7
mls qos trust device cisco-phone
but the answer had:
int f0.7
mls qos trust cos
I have 4 questions:
In this scenario, is there a difference between these two commands?
The "device cisco-phone" looks for the presence of a phone in cdp before the
cos is trusted... a much better choice IMHO
Are both enabling trust of the phones cos value?
Yes, but their's will allow a PC to send COS and have those markings
trusted... a bad idea.
Does the "trust device" require the "trust cos" command to take effect?
No.
Consider if you are also using "switchport priority extend cos #" command,
does either option still work as normal?
Yes. That command specifies the marking that PHONE should send the frames
received from the attached port as a certain cos. IMHO 5 should never be set
here, as voice uses that... unless- You had a CCM server attached to an IP
PHONE? LOL
-Joe
Blogs and organic groups at http://www.ccie.net
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