QoS Rate Limiting Options

From: Kenneth Wygand (KWygand@customonline.com)
Date: Fri Jul 02 2004 - 22:55:13 GMT-3


Hey there all you QOS geeks... (no, I'm not there yet!) ;-)
 
Is there a difference (and if so, what is the difference) between the following three ways of implementation:
 
(the intent is to limit ICMP traffic out of interface e0/0 to 128Kbps, with bursting of 1/4 this rate)
------------------------------------------------------------------------------
access-list 100 permit icmp any any
interface Ethernet0/0
  rate-limit output access-group 100 128000 16000 16000 conform-action transmit exceed-action drop
--------------------------------
ip cef
!
class-map match-all ICMP
  match protocol icmp
!
policy-map POLICE_ICMP
  class ICMP
    police cir 128000 bc 4000
!
interface Ethernet0/0
  service-policy output POLICE
--------------------------------
ip cef
!
class-map match-all ICMP
  match protocol icmp
!
policy-map POLICE_ICMP
  class ICMP
    police 128000 4000 4000 conform-action transmit exceed-action drop
!
interface Ethernet0/0
  service-policy output POLICE
--------------------------------
 
Thanks in advance!
Ken



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