QOS CIR Issues

[malusimsimango]

   I am having issues applying the service policy on a serial interface. I am getting the following error:

The present CIR value is 5. Configured Percent results in out of range kbps.Allowed range is 8-2000000.
The present CIR value is 5.

The bandwidth on the link is 128k and maximum bandwidth has been set to 100%. the policy map uses WFQ with WRED..

Please advise, the issue is not so well documented.

[gfcisco31]

Hi mate..

Please, paste the configutation here.

If you are configuring "bandwidth 5" under the policy/class config, it wont work.  For percentage, you should use "bandwidth percent 5" instead.

cheers

[Alcides Miguel]

Hi Gustavo,

I'm having the same issue with a link with 256K capacity.

policy-map BRANCH-WAN

class VOICE

  priority percent 25

class CALL-SIGNALING

  bandwidth percent 5

class ROUTING

  bandwidth percent 3

class NET-MGMT

  bandwidth percent 2

class MISSION-CRITICAL-DATA

  bandwidth percent 23

  random-detect

class TRANSACTIONAL-DATA

  bandwidth percent 12

  random-detect dscp-based

class BULK-DATA

  bandwidth percent 4

  random-detect dscp-based

class SCAVENGER

  bandwidth percent 1

class class-default

  bandwidth percent 25

  random-detect

Configured Percent results in out of range kbps.Allowed range is 8-2000000.

The present CIR value is 7.

[gfcisco31]

Have you tried to work with remaining percent instead of percent ??

Try to use percent only in the PRIORITY class(VOICE)

let me know

[gfcisco31]

Some restrictions...

Restrictions for All Supported Platforms

The following restrictions apply to the              bandwidth command:

• The amount of bandwidth configured should be large enough to also accommodate Layer 2 overhead.
• A policy map can have all the class bandwidths specified in either kbps  or percentage, but not both, in the same class. However, the unit for  the                  prioritycommand in the priority class can be different from the bandwidth unit of the nonpriority class.
• When the                  bandwidth                      percent command is configured, and a  policy map containing class policy configurations is attached to the  interface to stipulate the service policy for that interface, available  bandwidth is assessed. If a policy map cannot be attached to a  particular interface because of insufficient interface bandwidth, the  policy is removed from all interfaces to which it was successfully  attached. This restriction does not apply to the                  bandwidth                      remaining                      percent command.

[Alcides Miguel]

Hi Gustavo,

what I'm trying to understand is that I'm using the same policy in one interface with 128K and another with 512K and is working perfectly.

[noushadnoushad]

Hello Alcides,

Problem is you are reserving too small bandwidth for some classes.

ciso IOS needs minimum of 8kb for a class

class ROUTING

  bandwidth percent 3      --->  3/100*256 = 7.68  (which is less than 8k)

class NET-MGMT

  bandwidth percent 2      --->  2/100*256 = 5.12  (which is less than 8k)

class SCAVENGER

  bandwidth percent 1       --->  1/100*256 = 2.56  (which is less than 8k)

Please increase percentages to give above classes a minimum bandwidth of 8k

also reduce default class correspondingly to make total bandwidth not to exceed 100%