[c-nsp] Rate Lmiiting Problem

[Mikael Abrahamsson]

On Fri, 28 Jul 2006, Paul Stewart wrote:

> Hi there...
>
> I have a Cisco 3640 at a customer premise with rate-limit applied to a
> subinterface.... It's not working properly and I'm trying to figure out
> why:
>
> interface FastEthernet2/0.20
> description Internet
> encapsulation dot1Q 20
> ip address xx.xx.xxx.113 255.255.255.248
> rate-limit input 800000 1500 2000 conform-action transmit exceed-action
> drop
> rate-limit output 3000000 1500 2000 conform-action transmit
> exceed-action drop
> no snmp trap link-status
>
> They  have problems getting more than about 10Kb/s across this link..
> Any ideas why?  The link should be 3 meg downlink and 800Kb uplink +/-

Your burst size is way too low for TCP based traffic.

At least outbound you should try to shape the traffic instead of policing, 
that will work much better. If you need the ratelimit, set the burst size 
to at least half of the bits/second for normal internet use.

-- 
Mikael Abrahamsson    email: swmike at swm.pp.se