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

[Jared Gillis]

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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>