Rate-Limit All to 2MB's? 1

[MPDano]

Hi All,

I have a Cisco 2821 and want to limit the Outbound rate to around 2Megs. I currently have a bonded T1 on our Multilinkl. Can you provide a command to make this happen? Will this bring the link down?

Thanks in advance,

Leo

 

[burtsbees]

http://www.velocityreviews.com/forums/t38827-ratelimits-cisco-router.html

Burt

 

[MPDano]

Ok, I see they used:

rate-limit input 1024000 25000 25000 conform-action transmit exceed-action
drop

Can I just use:

rate-limit input 2048000

Do I need to add 25000 25000 conform-action transmit exceed-action ?

Which is trhe open question on the link.

 

[burtsbees]

rate-limit output 2048000 25000 25000 conform-action transmit exceed-action drop
You need output, not input, for what you want to do. I would make policy maps and an acl for this as well---just regular rate-limiting does not work all the time...

Burt

 

[lerdalt]

In a lab I setup the following to rate limit a customer so they can only have 1mbps of a 100mbps wan connection.

class-map match-any CM-UCL
match access-group name ACL-UCL

ip access-list extended ACL-UCL
permit ip any 172.27.0.0 0.0.0.255

policy-map PM-MO_WAN_QUEUING
class CM-UCL
police cir 1024000 bc 1544000
conform-action transmit
exceed-action drop
violate-action drop

interface FastEthernet0/0
description outbound from remote site
service-policy output PM-MO_WAN_QUEUING
!
interface FastEthernet0/1
description inbound from local
service-policy input PM-MO_ACCESS_MARKING


I have more to the class and policy maps for other applications.

 

[MPDano]

Burt,

What exactly is the 25000 part of it? Since the example I quoted was for 1MB, should I double this to 50000?

Leo

 

[MPDano]

Also, if I make this change on the Router, will it bring the link down?

 

[burtsbees]

The first number is bits per second, the second number is normal burst, the third is max burst. It will not bring the link down---this is one reason traffic shaping is better than just straight rate-limiting---it's called CAR/DCAR. Here's a Cisco link...

http://www.cisco.com/en/US/docs/ios/12_2/qos/command/reference/qrfcmd8.html

I would follow lerdalt's model.

Burt