[c-nsp] mls qos on 7600 with native vlan and MPLS
Jerome Durand
jdurand at renater.fr
Wed Oct 14 10:58:36 EDT 2009
> 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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Jerome Durand
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Services operations & support manager
Réseau National de Télécommunications
pour la Technologie, l'Enseignement et la Recherche
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