topic Re: QOS CIR Issues in Routing and SD-WAN

QOS CIR Issues

malusimsimango — Tue, 05 Mar 2019 00:48:31 GMT

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.

QOS CIR Issues

gfcisco31 — Sun, 01 Jul 2012 17:46:39 GMT

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

Re: QOS CIR Issues

Alcides Miguel — Wed, 15 Aug 2012 15:53:38 GMT

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.

Re: QOS CIR Issues

gfcisco31 — Wed, 15 Aug 2012 18:35:24 GMT

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

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

let me know

Re: QOS CIR Issues

gfcisco31 — Wed, 15 Aug 2012 18:37:57 GMT

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.

Re: QOS CIR Issues

Alcides Miguel — Thu, 16 Aug 2012 13:53:22 GMT

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.

QOS CIR Issues

noushadnoushad — Tue, 27 Nov 2012 08:21:30 GMT

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%