[c-nsp] LLQ not utilizing reserved bandwidth & packet drops in Nested policy-map (2 level hierarchial policymap)

Velimir Filipov vfilipov at evolink.com
Fri Feb 21 02:49:41 EST 2014


Provide us with full configuration of policy-maps/class-maps/access-lists(if used in the classes).

Also have you set up link bandwidth with the bandwidth command, as I am not sure when you use percents in the child policy classes, does it take a percent of the parent class CIR or it still looks up at the interface..

Best regards.

Thursday, February 20, 2014, 4:27:23 PM, you wrote:

> Hi,

> I think this issue is quite old but I could not get any conclusive
> explanation.

> Below is the configuration:

> C2800-R6-CPE1#sh policy-map parent-out

> В  Policy Map parent-out

> В  В  Class class-default

> В  В  В  Average Rate Traffic Shaping

> В  В  В  cir 128000 (bps)

> В  В  В  service-policy child-out1

> C2800-R6-CPE1#sh policy-map child-out1

> В  Policy Map child-out1

> В  В  Class EF

> В  В  В  priority 50 (%) 16000

> В  В  Class DATA1

> В  В  В  bandwidth 20 (%)

> В  В  Class DATA2

> В  В  В  bandwidth 10 (%)

> В  В  Class DATA3

> В  В  В  bandwidth 10 (%)

> C2800-R6-CPE1#

> In the above configuration, parent policy has 128Kbps and Child has 4
> Classes with Class EF is LLQ with priority of 50% bandwidth (burst size is
> default 1600bytes), class DATA1 with 20%, class DATA2 with 10% and class
> DATA3 with 10%.

> With the above configuration, I could not able to push beyond 16Kbps of
> traffic on class EF (LLQ). When the burst size is increased to 16000 bytes,
> I am able to push around 60Kbps.

> Wanted to understand this is the expected behavior of LLQ in Nested policy
> map or I am missing something.

> thanks in advance
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