[c-nsp] mls qos trust dscp on 7600 port-channel breaks IS-IS?

[Jared Gillis]

Does anyone have any thoughts on this at all? Known Cisco bug?

I really doubt it's the service-policy, as the policy is running on the Port-Channel right now with no problem. IS-IS only stops working across the interface when I add the mls qos trust dscp command to it.

I have the exact same queueing and trust config on other physical (non port-channel) ports on the same chassis with no issue.

On 08/10/2011 12:55 PM, Jared Gillis wrote:
> My service policy only sets internal queueing values based on source/dest IP or input DSCP.
> 
> policy-map SONIC-DEFAULT-QOS
>   class SONIC-PRIORITY-QUEUE
>    set dscp cs6
>   class SONIC-EXPEDITED-QUEUE
>    set dscp cs4
>   class CUSTOMER-EXPEDITED-QUEUE
>    set dscp cs2
>   class DEFAULT-QUEUE
>    set dscp default
> 
> I also have no COPP or other control-plane config enabled.
> 
> On 08/10/2011 12:00 PM, Dmitry Valdov wrote:
>>
>>
>> But.. ISIS uses CLNS, not IP. I'm confused :-)
>>
>>
>> On Wed, 10 Aug 2011, Blake Dunlap wrote:
>>
>>> You're leaving out what your service policy looks like, which is where my
>>> hunch says the problem lies.
>>>
>>> On Wed, Aug 10, 2011 at 13:28, Jared Gillis <jared.a.gillis at gmail.com>wrote:
>>>
>>>> Hi all,
>>>>
>>>> I just ran into an unusual problem when deploying some QoS onto a 7606 in
>>>> my network. I was configuring all ports to trust DSCP input, and after
>>>> applying the command to all the physical ports, I went to apply it to my the
>>>> port-channels. Shortly after I did, IS-IS went down (timeout) on the L3
>>>> links across those port-channels. IS-IS came back when I removed the trust
>>>> DSCP command. I've done some searching around and can't find any reference
>>>> to this feature/bug/wtf anywhere. Does anyone have any knowledge about why
>>>> this would happen?
>>>>
>>>> Here's my PO config:
>>>> interface Port-channel1
>>>>  switchport
>>>>  switchport trunk encapsulation dot1q
>>>>  switchport trunk allowed vlan 200
>>>>  switchport mode trunk
>>>>  mtu 9216
>>>>  load-interval 30
>>>>  service-policy input SONIC-DEFAULT-QOS
>>>>
>>>> And the command I entered was "mls qos trust dscp".
>>>>
>>>> Thanks
>>>>
>>>> -Jared
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>>
>