[c-nsp] catalyst 6500 not rewriting CoS / 802.1p bits

[Arie Vayner (avayner)]

Vladimir,

Try applying a different policy on the ingress port. Try using an MQC
one:

policy-map set-cos-5
  class class-default
   set cos 5
!
Interface Gig2/1
 service-policy input set-cos-5

Arie

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Vladimir
Ivashchenko
Sent: Sunday, February 10, 2008 00:32 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] catalyst 6500 not rewriting CoS / 802.1p bits

Hi List,

We cannot get Cat6500 to rewrite CoS values (802.1p bits).

Configuration is 

mls qos
no mls flow ip
no mls flow ipv6
no mls qos rewrite ip dscp
no mls acl tcam share-global
mls cef error action freeze

interface GigabitEthernet2/1
 switchport
 switchport trunk encapsulation dot1q
 switchport mode trunk
 no ip address
 load-interval 30
 wrr-queue queue-limit 40 30
 mls qos cos 5
 no cdp enable
 spanning-tree portfast trunk
 no mls qos trust

We have a sniffer connected to dot1q trunk on another port. The sniffer
shows that 802.1p value for packets going out from Gig2/1 is set to 0.
We have tried searching Cisco site and playing with various commands,
but did not succeed. IOS 12.2(18)SXF5.

Catalyst 3560 has "mls qos cos override" command, which seems to do the
trick, but this command is not available on Catalyst 6500.

--
Best Regards
Vladimir Ivashchenko
Chief Technology Officer
PrimeTel, Cyprus - www.prime-tel.com
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