QoS on IP/MPLS

From: iosluver@gmail.com
Date: Tue Jun 03 2008 - 12:26:55 ART


Hi,

This is off topic so please indulge me.

Based on the scenario below,
PE-X---------- ProviderRouter-X----------ProviderRouter-Y--------PE-Y

Which of the these 2 commands would work or have any effect on the MPLS link
beween Provider Y & PE Y?

mls qos trust cos

       or

mls qos dscp

I'm skeptical about whether the first command will work on an IP/MPLS
interface. My reason being, if the that command is configured on a PE, I'd
expect the Provider router to pop the label & send the packet with no label.
That said, MPLS EXP bits map to CoS but do not seem to be large enough to cater
for the 64 PHB that DSCP provides.

Can someone please clarify this for me?

Thanks in advance



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