[c-nsp] mls qos on 7600 with native vlan and MPLS

[Jerome Durand]

> For all egress traffic, PFC QoS uses a configurable map to derive a CoS value from the final internal DSCP value associated with the traffic. 

I understand, but what if your port is native? (ie. without 802.1p, 
means without cos??) How does the router classify from unexisting cos?

Thanks for the good references.

Jerome

>> I do run MPLS in the core for VPN services. The core interfaces are 
>> in mode "no switchport" and are untagged as well (routed ports on 10GE 
>> interfaces). Here too, what happens if I have cos based queueing (as 
>> this is native ethernet)? What happens if I run DSCP based queueing (as 
>> this is MPLS, can dscp be used?) My goal here is more to make sure that 
>> my qos does not break anything.
> For received Layer 3 MPLS packets, the PFC usually trusts the EXP value in the received topmost label. None of the following have any effect on MPLS packets: 
>  Interface trust state 
>  Port CoS value 
>  Policy-map trust command 
> 
> 
> Actually, there are a lot of information. I hope that these links will be usefull:
> 1) http://www.cisco.com/en/US/docs/routers/7600/ios/12.2SR/configuration/guide/qos.html
> 2) http://www.cisco.com/en/US/docs/routers/7600/ios/12.2SR/configuration/guide/mplsqos.html
> 
> Best regards,
> Olga.
> 
> 
> 

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