[c-nsp] QoS per ethernet subif

[Tassos Chatzithomaoglou]

Hi,

After reading http://www.cisco.com/en/US/tech/tk543/tk545/technologies_tech_note09186a0080114326.shtml
i'm trying the following config on a 7200-G1 (12.2(31)SB7) and i was wondering if there is any actual reason to use it.

!---------------------------------
policy-map TEST-POLICY
   class class-default
     shape average 4000000
    service-policy TEST-POLICY-CHILD
!
policy-map TEST-POLICY-CHILD
   class class-default
     priority 3000
   set cos 5
!
interface GigabitEthernet0/2.2
  encapsulation dot1Q 2
  ip address y.y.y.y
!
interface GigabitEthernet0/2.3
  encapsulation dot1Q 3
  ip address x.x.x.x
  service-policy output TEST-POLICY
!---------------------------------

Gi0/2 is connected to a 6500 and has ~10 subinterfaces like the above.
I want all traffic passing from specific subinterfaces to have priority over traffic passing from the other subinterfaces.

So...
Does it make sense to use priority on the default class or should i use another class for matching all traffic?
Does it make sense to use priority when there is only one class defined for the subif's policy?
Does priority traffic compete with traffic from the same subinterface only (where the policy is applied), or does it compete with 
the whole traffic passing through all subinterfaces?


-- 
Tassos