rate limiting

[lcaruso]

Hi,

can rate limiting be performed on the 3750? 4500? or is it the 6500 only?

Thanks.

[chandu.84]

see if this helps

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_44_se/configuration/guide/swqos.html#wp1253412

[lcaruso]

Thanks for your reply and taking the time to include that link.

A Cisco engineer had posed this question to me earlier today but didn't have time to answer. In considering his question and looking at the link you provided, I think he was speaking of rate limiting by protocol instead of by a percentage of a port's line speed.

Something more along these lines is what I believe he meant (router platform reference)

http://www.cisco.com/en/US/docs/ios/12_2/qos/command/reference/qrfcmd8.html

Is the 6500 platform the only one that can do this?

[chandu.84 · Accepted solution]

On 3750s :

Rate limiting is not supported by 3750,  but policing is:

One way to do egress rate-limiting is using:  'srr-queue bandwidth limit'  command.

For e.g:

Switch(config)# interface gigabitethernet 1/0/2

Switch(config-if)# srr-queue bandwidth limit 70

Another Way is :

policy-map rate-limit

class class-default

police 1000000 8000 exceed-action drop

int gi1/0/3

service-policy input rate-limit

service-policy output rate-limit

That should limit inbound and outbound at 1Mb

Another example is :

mls qos

!

class-map match-any Policy

match ip dscp 0 8 16 24 32 40 48 56

policy-map limit30M

class Policy

police 30000000 512000 exceed-action drop

!

end

int gi 1/0/1

speed 100

duplex full

service-policy input limit30M

srr-que bandwidth limit 30 (expressed as % of 100/full or 30% of 100MB, which is 30MB)

i did not try this but this might wrk i guess,, please try in a lab if u have

i think you can kinda play with these commands

Try and look through the command reference for 3750 for many ways

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_46_se/command/reference/cli1.html#wp1864211

These are my understandings

Thnx

[lcaruso]

I appreciate the time/effort you made to share this. Thanks.

[chandu.84]

np ur welcum