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Возникла такая штука, когда ISP упирается и не хочет давать на PQ более 80% полосы. Интересно, на чем это может быть основано (кроме как "хочу или традиции")?

Для роутеров на IOS 12.2 была рекомендация не использовать для всех классов более 75%, оставляя 25% для управления; было еще про оставить 1% на network control - что понятно. Но ограничения на 80 или 75% откуда берутся?

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ограничения на 80 или 75% откуда берутся?

max-reserved-bandwidth

 

... the percent of interface bandwidth allocated for Resource Reservation Protocol (RSVP), class-based weighted fair queueing (CBWFQ), low latency queueing (LLQ), IP RTP Priority, Frame Relay IP RTP Priority, Frame Relay PVC Interface Priority Queueing (PIPQ), or hierarchical queueing framework (HQF) ...

 

 

Command Default

75 percent on all supported platforms except the Cisco 7500 series routers, which do not have this restriction.

 

 

Usage Guidelines

...

The sum of all bandwidth allocation on an interface should not exceed 75 percent of the available bandwidth on an interface. The remaining 25 percent of bandwidth is used for overhead, including Layer 2 overhead, control traffic, and best-effort traffic.

 

If you need to allocate more than 75 percent for RSVP, CBWFQ, LLQ, IP RTP Priority, Frame Relay IP RTP Priority, Frame Relay PIPQ, or HQF, you can use the max-reserved-bandwidth command. The percent argument specifies the maximum percentage of the total interface bandwidth that can be used.

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