Rate limiting/Traffic shaping C3750

[eezergeezer]

Hey all,

Need some help on the best way to configure rate limiting and/or traffic shaping for a single interface.

Have a C3750-12S with an interface connected to a 10Mb circuit (leased line)  10Mb is shared over a 2 business units who respectively want 5Mb and 5Mb.

This is a L3 handoff with no trunk/vlan frames going over the circuit.

I want to be able to rate limit on policy I think by class map.

eg:

2 x destination networks (targets)

     192.168.0.0/28          Business  unit 1

     192.168.0.17/28        Business unit 2

transit is a /29

eg

10.1.156.0/29

I think I need to create a class map which will allow me to specify criteria for L3 -L4. Is this correct?

Does mls qos need to be enabled globally? ( i believe so) 

The switch is a production switch how will enabling mls impact the switch?

Would appreciate some example configs if possible.

thanks in advance..

A

[Joseph W. Doherty]

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Posting

You might try SRR sharing.  Direct you two subnets into two different egress queues and allocate each 50% of the bandwidth.

PS:

You could also SRR shaping, but I recommend sharing at it would allow each network to utilize bandwidth unused by the other network.

[Latchum Naidu]

Hi Amar,

If you are looking to rate limint on some L3 interfaces then you can use class map or rate limit commands directly under the L3 interface.

If you have a seperate Vlan's for example Network-A and Network-B then it would be possible to allocate bandwidth under the vlan's

See the below two individual steps may help in your scenario.

STEP-1:

Apply rate-limit on each L3 vlan interface in your 2851

Router# conf t
Router(config)# int vlan 2
Router(config-if)#rate-limit input 1000000 187500 375000 conform-action transmit exceed-action drop
Router(config-if)#rate-limit output 1000000 187500 375000 conform-action transmit exceed-action drop

STEP-2:

Policy a specific VLAN number on VLAN interface.

class-map vlan5
match vlan 5
match class-map class-default

policy-map vlan5-limit
class vlan5
police 2000000 250000 exceed-action drop

int vlan5
service-policy input vlan5-limit

After you apply this configuration, the traffic with VLAN 5 coming from any will be policed at 2Mbps.

Hope this will help you.

Please rate the helpfull posts.
Regards,
Naidu.