05-28-2007 06:50 PM - edited 03-03-2019 05:10 PM
From this doc:
Burst?defines the maximum number of tokens that the bucket can hold at any one time. To sustain the specified traffic rate, burst should be no less than the rate times the interval. Another consideration is that the maximum-size packet must fit into the bucket.
To determine the burst parameter, use this equation:
Burst = (Rate [bps]) * 0.00025 [sec/interval]) or (maximum packet size [bits]), whichever is greater.
For example, if you want to calculate the minimum burst value needed to sustain a rate of 1 Mbps on an Ethernet network, the rate is defined as 1 Mbps and the maximum Ethernet packet size is 1518 bytes. The equation is:
Burst = (1,000,000 bps * 0.00025) or (1518 bytes * 8 bits/byte) = 250 or 12144.
The larger result is 12144, which you round to 13 kbps.
Note: In Cisco IOS? Software, the policing rate is defined in bits per second (bps), as opposed to kbps in Catalyst OS (CatOS). Also in Cisco IOS Software, the burst rate is defined in bytes, as opposed to kilobits in CatOS
From my CAT6500
CAT6500> (enable) set qos policer aggregate COMMUNICATOR-VOICE rate 128 burst ?
<burst> Burst 1..32000 (kb)
From SRND and QoS enterprise guide:
set qos policer aggregate COMMUNICATOR-VOICE rate 128 burst 8000 drop
Why the burst is specfied to 8000 ?
How can i calculate it?
Thanks
05-29-2007 12:28 AM
hi guys, am configuring my router to support Linksys wireless skype version 3.2 and it doesnt work. can you advice me on what might be the problem with this
05-29-2007 01:45 AM
HI Justin, [Pls Rate if Helps]
Sample QOS Configuration for Voice & Data:
class-map match-any VoIP
match access-group 100 [subnet of VoIP]
class-map match-any RTP
match ip precedence 5
match ip precedence 4
!
!
policy-map low_level_QoS_backbone [as VoIP]
class RTP
priority 2000
class class-default
fair-queue
policy-map top_level_QoS_backbone_8M[as Data]
class class-default
shape average
service-policy low_level_QoS_backbone
policy-map top_level_QoS_backbone_
class class-default
shape average
service-policy low_level_QoS_backbone
policy-map Marking
class VoIP
set ip precedence 5
Pls Rate if Helps ! !
Best Regards,
Guru Prasad R
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