QoS question for policy-map

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May 4th, 2009
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I was trying to understand how the configuration below is possible, since the command "priority" always ask for a value next to it - either a percentage or a kilobps. In this case the "priority" command has nothing next to it and just below it we do have a policy command. IOS level is 12.2.4

How is that possible?

Thanks!

!

class-map match-any VOICE_TRAFFIC

match ip dscp ef

!

policy-map TEST_QOS

class VOICE_TRAFFIC

priority

police cir 311040000 bc 9720000 be 9720000 conform-action transmit exceed-action drop violate-action drop

!

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Laurent Aubert Mon, 05/04/2009 - 18:28
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  • Cisco Employee,

Hi,


It's hardware dependent. Platform like the 12000 doesn't support it because the LC can't support this implementation. Same thing for 7300 and NSE-100:


http://www.cisco.com/en/US/docs/routers/7300/maintain_and_operate_guides/7304_maintain_and_operate_guides/7304pxf.html#wp1034321


"However, starting in Cisco IOS Release 12.2(14)SZ, the kpbs value for the priority command is no longer configurable on the NSE-100."


Both configuration are different:


policy-map TEST_QOS

class VOICE_TRAFFIC

priority

police cir 311040000 bc 9720000 be 9720000 conform-action transmit exceed-action drop violate-action drop

!


This one will police the priority class all the time regardless if there is congestion or not.


policy-map TEST_QOS

class VOICE_TRAFFIC

priority 311040000

!


This one will police the priority class ONLY during congestion period. It's easier to implement such feature on software platform like ISR for example


HTH


Laurent.

MachadoGB Tue, 05/05/2009 - 05:36
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Thank you Laurent.

I think that is the point. It is HW related. I am using a 7609 (SUP720-3BXL) with the HW interface below for POS:

"1 SIP-400 controller (1 POS) & 1 Packet over SONET network interface"


here is the note from document "Cisco 7600 series Router SIP, SSC, and SPA Software Configuration Guide"

-----------------------------------

Note: The POS SPAs do not support bandwidth-limited priority queueing, but support only strict priority policy maps, that is, the priority command without any parameters.

-------------------------------------

Thanks for your help.


Regards,

Gilson

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