Ask a CBWFQ and LLQ question

we config qos on mpls network.use llq in CBWFQ. i have a question.
if i config LLQ for bandwidth 1m on 2M E1 line, and business data 0.5M(CBWFQ),defautl class 0.5M(CBWFQ). can i config this llq burst to 2M if line does not congest. or can i config business data or default class burst to 2M when line does not congest.
IF line congest. can llq and business,default class get gurantee bandwith?
i find when i config llq,i can use burst parameter:
priority bandwidth burst
when i need llq to burst to 2m, Does i need config this burst parameter. or i don't need config this burst parameter, i can get burst too.
thank you!
Tom

(Yet another explanation.)
"if i config LLQ for bandwidth 1m on 2M E1 line, and business data 0.5M(CBWFQ),defautl class 0.5M(CBWFQ). can i config this llq burst to 2M if line does not congest."
LLQ should allow up to the full 2 Mbps, if there's no congestion. If there's congestion, LLQ will police itself at the rate specified. More on bursting, below.
"or can i config business data or default class burst to 2M when line does not congest."
Either the business data or default classes should also be able to obtain full bandwidth, if there's no congestion. Excess demand will queue the excess packets.
"IF line congest. can llq and business,default class get gurantee bandwith?"
Yes, if there's congestion, LLQ will police its traffic, i.e. immediately drop excess, other classes will queue excess traffic; will drop if queues overflow (and/or WRED drop).
"i find when i config llq,i can use burst parameter:
priority bandwidth burst
when i need llq to burst to 2m, Does i need config this burst parameter. or i don't need config this burst parameter, i can get burst too."
If you specify burst, you're really adjusting the time interval the policier operates. I believe the default is based on 200ms, so if there's more than 25,000 bytes (1 Mbps * .2 sec / 8 bits/byte), the excess will be dropped. (All the non-dropped bytes will transmit at full rate.)
When to adjust burst? If your traffic's long term average is under your LLQ bandwidth setting, but short term traffic rate is very variable (e.g. many video streams), you should increase the burst size to avoid dropping packets.

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