topic Re: QoS - Token bucket question in Network Security

QoS - Token bucket question

mkayacan — Fri, 21 Feb 2020 06:11:37 GMT

"If the actual debt is greater than the extended limit, all packets will

be dropped until the actual debt is reduced through accumulation of

tokens in the token bucket."

(from "Policing and Shaping Overview")

Does it mean, that the next tokens (number equal to actual debt) are

discarded (not put in the bucket) to reduce the amount of "actual debt" ?

Another point I wonder whether the token bucket is replenished at regular intervals or replenished continuously ? (for example if average rate is 20 bits/sec, then bucket is replenished 10 bits after 0.5 sec or only replenished by 1 sec intervals by 20 bits?)

Thanks in advance.

Murat

Re: QoS - Token bucket question

Philip D'Ath — Mon, 06 Jan 2003 09:11:28 GMT

The debt is measured in tokens, so the next tokens will be added to the bucket (reducing the debt).

Don't confuse tokens and packets.

I *believe* the token bucket is refreshed many times per second.

Re: QoS - Token bucket question

shailendra.gupta — Mon, 06 Jan 2003 14:48:02 GMT

Dear Friends

1. When total Debt exceeds the limits of Extended Bucket, packets gets dropped and once packets gets dropped, the value of Compounded Debt gets RESET.

2. Yes, Token replenishment is a continuous process and this is done at the rate defined as CIR.

I trust this brings clarity.

Shailendra