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rate limitation

network770
Level 1
Level 1

Can someone explain to me how rate limitation works on an interface or vlan:

policy-map abc

  class def

   police 3072000 384000 384000    conform-action transmit     exceed-action drop     violate-action drop

how is qos differ than rate-limit?

how do i rate limite an interface to get say 2MG to the Internet?

Is there a need for queing?

I looked over the cisco qos doc and there's far to much info there, I am looking for the 'crash course'

3 Replies 3

Haris P
Level 4
Level 4

Dear Ronni ,

To rate-limit the traffic on the link , I prefer to do shaping

policy-map 2Meg

class class-default

  shape average 1024000

int f0/0

service policy output 2Meg

The difference between policing and shaping is described in the below linl

http://www.cisco.com/en/US/tech/tk543/tk545/technologies_tech_note09186a00800a3a25.shtml

Please let me know which platform you are using

Hi Ronni,

See the below rate limit implementation.

Rate limit on an interface:

Router# conf t
Router(config)# int gi3/34
Router(config-if)#rate-limit input 1000000 187500 375000 conform-action transmit exceed-action drop

Rate limit on an vlan interface:

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.

andtoth
Level 4
Level 4

Hi,

QoS highly depends on the platform you are using. For example, Catalyst switches does not have the rate-limit command (although sometimes configurable in CLI, will not do anything).

You can rate limit traffic with the policy-map you've included (if the traffic matches the configured class-map) by applying it on an interface with the 'service-policy abc' command under interface configuration mode. Note that some Catalyst switch platforms allow a policy-map to be applied in the input direction only.

Best regards,

Andras

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