Bandwidth command

Unanswered Question
Aug 28th, 2007


I have gig link on switch , but like to allow customer only 10M bandwith, will configuring "Bandwidth 10000" be enough to achive this,


I have this problem too.
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rais Tue, 08/28/2007 - 07:26

Negative. You need to use policing to limit the rate you accept data from customer.


thomas.anthony Tue, 08/28/2007 - 07:42

Best way would be adding a rate-limit for the gig port, The bandwidth command would not help.

mohammedrafiq Tue, 08/28/2007 - 07:46


Actually its a trunk gig port with 2 vlans,vlan 10 and 20.

Vlan 10 needs 10M and 20 needs 20M bandwith, can only rate-limit will do the trick or I need Policing,


Edison Ortiz Tue, 08/28/2007 - 07:47

The bandwidth command is useful for dynamic routing protocols and network management agents when calculating link speeds.

As other mentioned, if you want want to control bandwidth on a switchport, you either need to use rate-limit (QoS) or storm-control.

mohammedrafiq Tue, 08/28/2007 - 09:44


Thanks for the URL,as I mentioned its a gig trunk port, but I have only access to my side of the switch, not for far side, So If I do policing on my side , will it work without doing on boht side of the trunk.

I am using 3560/3750 switches.


Edison Ortiz Tue, 08/28/2007 - 10:22

I don't have switches at the moment to lab it up but it should work.

In theory,

1) Create an ACL matching the Vlan traffic

2) Create a class-map and reference that ACL

3) Create a policy-map, reference the class-map and apply the police value

4) Apply the service-policy command in the trunk switchport.

Joseph W. Doherty Tue, 08/28/2007 - 16:28

(NB: Didn't double check whether trunk port has issues with following.)

The "normal" policing function appears to be inbound only on the 3560/3750 series. If you want to limit traffic in both direction to 10 Mbps, you'll need two policers. One for ingress on you side, to manage the outbound traffic. And, since you don't have access to the far side, an inbound policer for the trunk.

Two more possible methods to rate limit the outbound traffic, is use "srr-queue bandwidth limit" to limit the port's overall transmit rate (probably not what you want) or manage egress queues using "shaped mode" with one queue dedicated for customer traffic.

The link Edison provided has full details.

mohammedrafiq Wed, 08/29/2007 - 08:11


Thanks , we only concerns that we dont send more than 10M traffic to the customer otherwise they will charge us.



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