cisco 3560 switch| mls qos trust dscp question

[sarahr202]

Hi everybody

Hi everybody .

Please consider the following example:

3560 sw f1/1--------trunk---SW2

3560 sw

f1/1

mls qos trust dscp

3560 is using default cos-dscp map, assume a 3560 receives a frame carrying IP packet on f1/1 with COS 4, what will 3560 switch do?

1) will it use its default cos --dscp map  ( cos 4--.dscp 32) and rewrite 32 in dscp field  of the packet in the frame and provide PHB for dscp 32 ?

Much appreciated!!

Have  a great weekend.

[mlund · Accepted solution]

Hi

No it will not trust the cos value, because You have configured to trust dcsp. So, the switch will trust the dcsp value in the incoming frame.

/Mikael

[sarahr202]

thanks Mikael