Available Queues on Satellite ASR9000v

[j.hoffmann]

Hi,

I'm a little bit confused about the available/usable queues on a Satellite ASR9000v.

In a FAQ about the QoS offload topic two Cisco employees wrote this:

A config guide chapter relating QoS offload, shows the following config which use the qos-group 3 with no special focus on priority queuing. Are all Queues 0-5 (6 Queues in total) usable and why is of all things Queue-3 reserved for priority use? 

interface GigabitEthernet200/0/0/10
nv
  service-policy input access
!
!
 
interface Bundle-Ether200
ipv4 point-to-point
ipv4 unnumbered Loopback3000
nv
  satellite-fabric-link satellite 200
   service-policy output icl
   redundancy
    iccp-group 10
   !
   remote-ports GigabitEthernet 0/0/0-43
  !
!
!
policy-map icl
class icl1
  bandwidth remaining percent 5
!
class icl2
  bandwidth remaining percent 4
!
class icl3
  priority level 1
!
class icl4
  bandwidth remaining percent 1
!
class class-default
  bandwidth remaining percent 1
!
end-policy-map
!
 
RP/0/RSP1/CPU0:vkg3(config)#show running-config policy-map access
policy-map access
class access1
  set qos-group 1
!
class access2
  set qos-group 2
!
class access3
  set qos-group 3
!
class access4
  set qos-group 4
!
class class-default
!
end-policy-map
!
 
class-map match-any access1
match cos 1
match precedence 1
end-class-map
!
class-map match-any access2
match cos 2
match precedence 2
end-class-map
!
class-map match-any access3
match cos 3
match precedence 3
end-class-map
!
class-map match-any access4
match cos 4
match precedence 4
end-class-map
!
class-map match-any icl1
match qos-group 1
end-class-map
!
class-map match-any icl2
match qos-group 2
end-class-map
!
class-map match-any icl3
match qos-group 3
end-class-map
!
class-map match-any icl4
match qos-group 4
end-class-map
!

 Regards,

Jens

[Aleksandar Vidakovic]

The priority action in qos-group 3 is implicit. There is no need to configure it explicitly. 

You can make use of all qos-groups in the range 0 to 5. Groups 6 and 7 are reserved. 

hope this helps,

/Aleksandar

[j.hoffmann]

Hi Aleksandar,

thank you for the quick answer.

So, the Queue-3, linked to qos-group 3, is the right and only queue for user traffic requiring LLQ handling?

You wrote that I can use all qos-groups in the range from 0 to 5.

A statement in a config guide, that I've found, mentioned the range only from 1 to 5 and Queue-0 is in use if no other policy matches (class-default)?

[Aleksandar Vidakovic · Accepted solution]

Yes, qos-group 3 is the only one that can be used for high priority traffic.

The qos-group 0 is also available to you. The config guide that you have shared doesn't call it out because its use is implicit. If you don't configure any qos-group explicitly, traffic will use qos-group 0.

[j.hoffmann]

Thank you Aleksandar!