Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

CAR

Dear All,

In committed Access Rate the syntax is as follows

rate-limit {input | output} [access-group [rate-limit] acl-index | qos-group number] bps burst-normal burst-max conform-action action exceed-action action

e.x

rate-limit output 20000000 24000 24000 conform-action transmit exceed-action drop

Can any one explain how we achive Normal burst rate like

Burst Rate= CIR * (1/8) * 1.5

What is that 1.5 is for......

Many Thanks,

Saran

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Silver

Re: CAR

Hello Saran,

in CAR configuration the second and the third parameters are the normal burst size and the extended burst size expressed in bytes.

They are the size of buffers that can hold packets.

The idea is to allow for some burstiness of traffic.

So going to the formula it says:

Burst Size [B ] = CIR [ bps ] * 1/8 [B/b] * 1,5 s

that 1,5 is a time interval expressed in seconds.

so the command says:

allocate X bytes for normal buffer to be able to accomodate 1.5 seconds of traffic at CIR rate.

Hope to help

Giuseppe

1 REPLY
Hall of Fame Super Silver

Re: CAR

Hello Saran,

in CAR configuration the second and the third parameters are the normal burst size and the extended burst size expressed in bytes.

They are the size of buffers that can hold packets.

The idea is to allow for some burstiness of traffic.

So going to the formula it says:

Burst Size [B ] = CIR [ bps ] * 1/8 [B/b] * 1,5 s

that 1,5 is a time interval expressed in seconds.

so the command says:

allocate X bytes for normal buffer to be able to accomodate 1.5 seconds of traffic at CIR rate.

Hope to help

Giuseppe

98
Views
0
Helpful
1
Replies
CreatePlease login to create content