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Low latency Queue(LLQ) maximum bandwidth allocated - QoS

All,

What maximum bandwidth can allocated in LLQ queue for traffic real time ? For exemple when use bandwidth 512kbps, and allocate for real time (EF) 384kbps to some apllication.

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New Member

Re: Low latency Queue(LLQ) maximum bandwidth allocated - QoS

It is up to you: you can allocate as much as you can. But world practice shows that by allocating more that 35-50% to real-time traffic (LLQ [Voice + Video]) might cause you some problems. (“Cisco AVVID Network Infrastructure Enterprise Quality of Service Design” Solutions Reference Network Design)

Also remember the 75% rule: by default CISCO will let you allocate only 75% of available bandwidth. Using max-bandwidth command you can change the % portion to 100% if you need.

Configuring LLQ usually you need to thing about minimum of 3 aspects:

1. How much to be allocate for Priority queue

0 - 35%

2.How much to be allocated for other defined classes

Do not forget about default class: all unclassified traffic will fall under “default” class

35 - 75% (75% by default, optional 100%)

Regards,

Vakhtang

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