Community discussions

GJS
Member
Topic Author
Posts: 418
Joined: Sat May 29, 2004 4:07 pm
Location: London

### Limits

Can someone explain what the function of the various simple queue limits are? I do not understand these explanations from the manual:

limit-at - allocated stream data rate
max-limit - maximal stream data rate
total-limit-at - allocated total (bidirectional) stream data rate
total-max-limit - maximal total (bidirectional) stream data rate
burst-limit - maximal allowed burst of data rate in form of in/out
burst-threshold - average burst threshold in form of in/out
burst-time - burst time in form of in/out
total-burst-limit - maximal allowed total (bidirectional) burst of data rate
total-burst-threshold - Total (bidirectional) average burst threshold
total-burst-time - total (bidirectional) burst time

To sumarise:

1. What is the difference between allocated stream rate and maximal rate?
2. What is burst limit, burst threashold and burst time?

Thanks,
Guy

lastguru
Trainer
Posts: 435
Joined: Fri May 28, 2004 9:04 pm
Location: Certified Trainer/Consultant in Riga, Latvia
Contact:
International MikroTik Certified Trainer and Consultant form Latvia.
I do RouterOS Training and Certification worldwide!

skype: lastguru

Bill
Frequent Visitor
Posts: 70
Joined: Fri May 28, 2004 4:24 pm
The Target Address is the IP you are controlling the speed for. The bandwidth limits are in the format upload/download. Leave Destination address at 0.0.0.0/0, queue type as default.

The Limit-At setting is the minimum allocated speed for the queue.
The Max-Limit setting is the maximum allocated speed for the queue.
The Burst-Limit setting is the speed limit allowed above maximum.
The Burst-Threshold is the speed at which the time counter starts.
The Burst-Time is how long they are allowed to stay above the Burst-Threshold before being dropped back down to the Max-Limit.

For Example, a Simple Queue with the following settings:
Limit At: 65536/131072
Max Limit: 262144/524288
Burst Limit: 393216/786432
Burst Threshold: 262144/524288
Burst Time: 240

This will give the client a 64/128k slice of the available bandwidth. Their connection is limited at 256/512k. They are allowed to burst up to 384/768k. If they sustain a connection above 256/512k for more than 240 seconds, they are throttled back and held at 256/512k until they drop below that speed. The counter then restarts and they are able to burst above their regular limit again.

GJS
Member
Topic Author
Posts: 418
Joined: Sat May 29, 2004 4:07 pm
Location: London
Thanks, Bill, this is just what I needed. Sorry for being generally dumb but in your example, I can't see the significance of Limit At speed. Under what circumstances does the customer get 64/128k?

Thanks,
Guy

Bill
Frequent Visitor
Posts: 70
Joined: Fri May 28, 2004 4:24 pm
The Limit-At speed is the guaranteed minimum speed the customer should get. If the router is heavily loaded and can't provide the 256/512, it will try to give the customer at least 64/128k. If you leave Limit-At blank, then it is a best-effort service and the customer gets whatever is available.

GJS
Member
Topic Author
Posts: 418
Joined: Sat May 29, 2004 4:07 pm
Location: London
Got it, Bill, thanks.

Guy

### Who is online

Users browsing this forum: andya, JRLL, KENYx120 and 89 guests