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QOS/ priority level command / IOS XR

shreerampardhy
Beginner
Beginner

Hello All,

Has anyone used the priority level command in IOSXR? If we have multiple classes under the same policy map which are assigned a priority level, then how will it affect the scheduling?

For example I have following config

policy-map test

Class 1

priority level 1

police rate percent 10

!

class 2

priority level 2

police rate percent 10

!

class default

bandwidth percent 80

Will my default class be able to take up all the bandwidth in case i dont have traffic for class 1 and class 2?

Will the above config generate two LLQ classes with strict policing?

Is there any documentation available for this priority level command usage?

Regards,

Shreeram

1 ACCEPTED SOLUTION

Accepted Solutions

Aleksandar Vidakovic
Cisco Employee
Cisco Employee

Priority queue level 1 is served first, at strict priority, until the queue is empty or the BW limitation imposed by policing is reached.

PQ level 2 is scheduled after priority level 1, until the queue is empty or the BW limitation imposed by policing is reached.

BW classes are scheduled afterwards.

If there is less traffic to be sent in PQ1 nor PQ2 than the configured policer limit, other classes can take up the BW allocated to PQ1 and PQ2. 'bandwidth [percent]' command defines the guaranteed minimum BW for the class, it does not impose the maximum BW.

All configuration commands are dicumented in http://tools.cisco.com/Support/CLILookup/cltSearchAction.do

View solution in original post

2 REPLIES 2

Aleksandar Vidakovic
Cisco Employee
Cisco Employee

Priority queue level 1 is served first, at strict priority, until the queue is empty or the BW limitation imposed by policing is reached.

PQ level 2 is scheduled after priority level 1, until the queue is empty or the BW limitation imposed by policing is reached.

BW classes are scheduled afterwards.

If there is less traffic to be sent in PQ1 nor PQ2 than the configured policer limit, other classes can take up the BW allocated to PQ1 and PQ2. 'bandwidth [percent]' command defines the guaranteed minimum BW for the class, it does not impose the maximum BW.

All configuration commands are dicumented in http://tools.cisco.com/Support/CLILookup/cltSearchAction.do

Hello Aleksandar,

Thank you very much for the reply.

Regards,

Shreeram

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