I am having trouble calculating some real world burst sizes for QoS. My goal
is simply rate limit TCP as closely to 1.0 Mb as possible. I understand the
sawtooth will make this difficult and the fact that packet sizes are ever
changing, but I am basing my caluclation on 1500 byte Ethernet.
the command specifically is:
police 1000000 burst-size exceed-action drop
It is this burst size that I am not sure how to calculate. Using Cisco's
formula I tend to get very small numbers ( 250 bits etc...the default
minimum is 8KB!) I have played around with a traffic generator and kind
eyeballed that for 1.0 Mb of traffic a burst size of 125000 seems to work.
Is this a reasonable number? What have other poeple used? Are there any
guidelines to what this should be set to?
Below is a config of what I have:
switch# sh class
Class Map match-all ANY (id 2)
Match access-group 101
switch# sh access-li
Extended IP access list 101
permit ip any any
switch# sh poli
Policy Map test3
class ANY
police 1000000 125000 exceed-action drop
switch# sh run int f0/1
Current configuration : 109 bytes
!
interface FastEthernet0/18
switchport mode access
no ip address
service-policy input test3
end
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