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

[Vladimir Ivashchenko]

Just to make sure I'm clear: "802.1p value for packets going out from Gig2/1 is set to 0" - I mean packets received 
from Gig2/1, going to the Linux box on another interface, have CoS bits set to 0, despite "mls qos cos 5" on the 
Gig2/1. The sniffer is running on the Linux box.

On Sun, Feb 10, 2008 at 12:31:37AM +0200, Vladimir Ivashchenko wrote:

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