C4507r rate-limit question

Unanswered Question
Jan 26th, 2010

Hi Everyone.


  is it possible to do an equivalent to a rate-limit (CAR) on a C4507r?  What im looking to do is be able to have various rate-limits on a various vlan for both upload and download.  I've used the rate-limit (CAR) on a router but on the C4507r it looks like (CAR) is not allowed.


Thank You

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Michael Johnson Tue, 01/26/2010 - 07:48

I assume you mean applying rate limiting capabilities on layer 3 SVI's?


You can use the rate-limit command in interface config mode as well as the modular qos cli (MQC);


class-map

.......


policy-map vlanX

....

....



interface vlanX

service-policy .....



mike

hcintron Tue, 01/26/2010 - 12:24

Hi Mike.


  Thanks for the reply.  If I enter a interface vlanxxx I cannot add the rate-limit command:


spare_equipment(config)#int vlan800
spare_equipment(config-if)#r?
% Unrecognized command


I did read the "Applying QoS Features Using the MQC"  If I understand it correctly, if I have 2 policies

"test one" will have a download of 6m and upload of 4m

"test two" will have a download of 2m and upload of 1m


I would do the following:


! ********************* test one

class-map match-all test
  description test rate-limit
match any
!
!
policy-map vlan800in
class test
    police 6000000 bps 8000 byte conform-action transmit exceed-action drop


policy-map vlan800out
class test
    police 4000000 bps 8000 byte conform-action transmit exceed-action drop


! ******************** test 2

class-map match-all test2
  description test2 rate-limit
match any
!
!
policy-map vlan900in
class test2
    police 2000000 bps 8000 byte conform-action transmit exceed-action drop


policy-map vlan900out
class test2
    police 1000000 bps 8000 byte conform-action transmit exceed-action drop



! ************** applied




interface Vlan800
ip address 10.94.0.2 255.255.255.0
service-policy input vlan800in
service-policy output vlan800out


interface Vlan900
ip address 10.95.0.2 255.255.255.0
service-policy input vlan900in
service-policy output vlan900out


is this correct?

Edison Ortiz Tue, 01/26/2010 - 13:03

Hi Hector,


If you are planning to apply the service-policy under the SVI, you must configure the physical interfaces with the qos vlan-based command.

Additionally, you can avoid configuring the class-map and instead use the policy-map with the class class-default.

Another note, the accuracy of the policer configured is +/- 1.5 % so you will experience traffic over the policed limit.

For more information, I highly suggest you read the documentation on implementing QoS on 4500 for any other caveats you may face

depending upon the hardware that is used.


http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/52sg/configuration/guide/qos.html#wp1461453


Regards


Edison.

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