Hello List!
In our MPLS network we use 7604RSP720 with SPA-5X1GE-V2 installed in SIP 400 as
PE router, where clients services terminates. As in MPLS edge, we perform
"typical" traffic classification and marking.
Standart policy-map looks like this (matching based on DSCP, marking with MPLS
EXP):
Policy Map Network-VoIP-In
Class qos-realtime
set mpls experimental imposition 5
...
Class class-default
set mpls experimental imposition 0
Class Map match-any qos-realtime (id 21)
Match ip dscp ef (46)
For example, we have two subinterfaces, gi3/0/0.210 and gi3/0/0.211. Both of
them have policy-map looks like described one. If packet enters gi3/0/0.210
with DSCP=EF and go to gi3/0/0.211, it appears with DSCP=CS5. Is this normal?
For 76x, it is.
Because of 76x platform QoS realization traffic local for router (IP-IP),
router overwrites DSCP value of packet when such policy-map in use:
http://www.cisco.com/en/US/docs/routers/7600/ios/12.2SR/configuration/guide/mplsqos.html#wp1475897
I've even opened a case, but the best proposed approach was to distinguish with
ACL IP-IP traffic and IP-MPLS traffic. This is a bad solution for us: increased
load on router, many hand-work and we have hundreds of such circuits..
We are trying to resolve this problem from April - and no sufficient solution..
Maybe someone have resolved this?
P.S. "no mls qos rewite ip dscp" doesn't work properly on PFC MPLS, already
tried.
Best regards,
Olga
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