From: Ng, Kim Seng David (David) (ksng@avaya.com)
Date: Wed Apr 28 2004 - 06:31:50 GMT-3
Hello group,
I would like to seek confirmation whether my understanding of the following is correct. The following two configurations will produce the same results i.e. the ingress data COS will be assigned "1" and ingress voice COS (regardless of the original value of COS) will be overwritten to "1" also.
Config 1:
======
mls qos
!
interface FastEthernet0/1
switchport access vlan 20
switchport voice vlan 100
mls qos cos 1
Explaination: Since by default the cat3550 ports are not trusted, all ingress COS values will be overwritten to the default COS which is configured as "1" here. As for untagged ingress data, it will acquire default COS of "1".
Config 2:
======
mls qos
!
interface FastEthernet0/1
switchport access vlan 20
switchport voice vlan 100
mls qos cos 1
mls qos trust cos
mls qos cos override
Explaination: Even though I configured COS trusting here, the "override" command will still overwrite all ingress COS to "1". As for untagged ingress data, it will acquire default COS of "1".
What I am trying to get here is that I do not need to have the "override" command to overwrite the COS value if the port is already in an "untrusted" state. Is my understanding correct?
Thanks in advance
David
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