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Beginner

QoS priority level 1-7 IOS-XR

Hello guys,

could someone share more info about the introduced QoS feature (from IOS-XR 5.3.2) to support up to 7 priority levels in LLQ?

RP/0/RP0/CPU0:at0f2a-r2n0-gr(config-pmap-c)#priority level ?
 <1-7>  Priority level

I was aware of only about priority levels 1-2 where level1 has higher priority than level2 but both are high priority queues.

Now I am little bit confused as there is no good description of this new capability.

What is the relationship between those different 7 levels now?

How they behave and what is the benefit to have 7 different priority queues?

How to map this to the 8Q/16Q model?

 

Any help would be much appreciated.

 

Thank you a lot.

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Accepted Solutions
Cisco Employee

Re: QoS priority level 1-7 IOS-XR

Priority level 7 is highest, then 6, and so on. As it is a strict priority mode, there is a possibility that traffic on lower priority queues will be starved as long as there is continuous traffic on higher priority queues.

 

Sam

3 REPLIES 3
Cisco Employee

Re: QoS priority level 1-7 IOS-XR

Priority level 7 is highest, then 6, and so on. As it is a strict priority mode, there is a possibility that traffic on lower priority queues will be starved as long as there is continuous traffic on higher priority queues.

 

Sam

Beginner

Re: QoS priority level 1-7 IOS-XR

Hi Sam,

thank you very much for your reply. I am wondering what is the purpose/usage example to have so many PQs? When there were only 2 PQs, usual usage was to have 1 PQ for Voice and another PQ for Video, but 7 PQs?

Are there any restrictions to use those 7 priority queues?

I didn't find too much information about this feature in cisco webpages, do you know about some good documentation about this?

 

Thank you again Sam,

have a nice day,

Michal.

Cisco Employee

Re: QoS priority level 1-7 IOS-XR

One example would be if you had the typical QoS classes of video, voice, business class, scavenger / best-effort, etc then you can assign a PQ to each one.

 

There isn't much in the way of configuration except to assign priority level x to the class.

 

Sam

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