QOS CLI Changes on Cisco Router's

Unanswered Question
Jul 28th, 2008

Hello Experts,


Below provided is my QOS Config:


policy-map Customer-DMPLS

class voice

priority 256

class video

priority 1536

class data

bandwidth 896

class class-default

bandwidth 16384


The Show command output of my Policy-map:


Router#sh policy-map Customer-DMPLS

Policy Map Customer-DMPLS

Class voice

Strict Priority

Bandwidth 256

Class video

Strict Priority

Bandwidth 1536

Class data

Bandwidth 896

Class class-default

Bandwidth 16384



Question is:

============


In the QOS Configuration the VOICE & VIDEO class are reserved for Bandwidth using "Priority" words.


In the sh policy-map output the same are showing as: "Strict Priority" for VOICE & VIDEO Class.


Then, what is the exact difference between the "STRICT Priority" & "Priority" keywords on QOS.


Whether the CISCO has made changes in CLI only or how ?


Thanks in Advance for HELP.


Best Regards,


Guru Prasad R


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4rmorris Mon, 07/28/2008 - 12:59

The "priority" keyword turns on a strict priority queue. This means that not only is the queue prioritised to send traffic first, but it is also policed at the rate configured.


So unlike the "bandwidth" command, that allows traffic in the class to go beyond the configured value if available, traffic in the "priority" queue is capped at 256k or 1536k.


Keep in mind that there's only 1 priority queue. So in your case, voice and video go in the same queue, but will be policed at different rates.


Regards,


R.

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