limit the throughput of an ethernet interface

[mnieuwendijk]

What is the easyst way to configure an catalyst 3750 switch to limit traffic going to an ethernet port.

I want to adjust the throughput of an 100 mb ethernet port so that only 5 mb is going through.

I was looking at traffic policing and shaping. But i thought there was a easyer way.

grtz marc

[leonvd79]

You're close. It is done to the enhances QoS features available to the 3750 platform. Take a look at the egresss bandwidth limiting feature.

http://www.cisco.com/univercd/cc/td/doc/product/lan/c

at3750/12225see/scg/swqos.htm#wp1253412

HTH

Leon

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[mnieuwendijk]

Leon is pointing me in the good direction, but is there an solution also for other types of catalyst switches.

2950 for example.

grzt marc

[arvindchari]

The easiest way would be to set the port to half duplex and 10 mbps .. this would net you 5mbps each way with no additional configuration requiered!

Then again I gave this answer coz I know little or nothing about QoS :(

HTH!

[mnieuwendijk]

Meaby for this solution it is the answer but i also want to adjust the troughput for different speeds.

So a more acurate solution is needed.

grtz marc

[arvindchari]

Indeed its just a temporary solution and a bad one at that. Just meant it light heartedly.

You might wanna try something along the following lines:

6500(config)# access-list 102 permit ip host 10.1.1.1 any

6500(config)# class-map identify-unwanted-traffic

6500(config-cmap)# match access-group 102

This series of statemnts defines that you want to identify what traffic has the blocked @ the set 5mbps level.

6500(config)# policy-map police-unwanted-traffic

6500(config-pmap)# class identify-unwanted-traffic

6500(config-pmap-c)# police flow mask src-only 5000000 5000 conform-action transmit

exceed-action drop

6500(config-pmap-c)# interface fa3/1

6500(config-if)# service-policy input police-customer-traffic

This should do the trick ! :)

This defines a policy map and a class map

[jdedon]

This config works fine when you configure your service-policy as input on the interface, but what if you have the need to configure as output? I have a 3750 that says service-policy output not supported when I try to configure iton an interface.

I have a need to limit bandwidth use on an ethernet connection where I do not control the downstream router.

Any suggestions? I am running 12.1(14r)EA1 code

[jdedon]

BTW, I mean a solution other than the srr-queue bandwidth command.

Thanks

[Marvin Rhoads]

QOS policing is pretty straightforward:

set qos policer aggregate rate 25000 burst 250 drop,

for example will set a 25 Mbps link limit. then use:

set qos acl ip Acl trust-ipprec aggregate ip

any,

and finally:

commit qos acl all

Hope this helps. Please rte helpful posts.