Bandwidth Control

Bandwidth Control
Document revision 1.5 (Fri Feb 03 15:15:03 GMT 2006)
This document applies to V2.9

Table of Contents
Table of Contents
Summary
Specifications
Related Documents
Description
Additional Documents
Queue Types
Description
Property Description
Interface Default Queues
Description
Property Description
Example
Simple Queues
Description
Property Description
QueueTrees
Description
Property Description
Example of emulating a 128Kibps/64Kibps Line
Queue Tree Example With Masquerading
Equal bandwidth sharing among users

General Information
Summary

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PFIFO

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BFIFO

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SFQ

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RED

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PCQ

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HTB

Specifications
Page 1 of 22
Copyright 1999-2006, MikroTik. All rights reserved. Mikrotik, RouterOS and RouterBOARD aretrademarks of Mikrotikls SIA.
Other trademarks and registred trademarks mentioned herein are properties of their respective owners.

Packages required: system
License required: level1 (limited to 1 queue), level3
Home menu level: /queue
Standards and Technologies: None
Hardware usage: significant

Related Documents
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Description

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• queuing discipline (qdisc) - analgorithm that holds and maintains a queue of packets. It
specifies the order of the outgoing packets (it means that queuing discipline can reorder
packets) and which packets to drop if there is no space for them
• CIR (Committed Information Rate) - the guaranteed data rate. It means that traffic rate, not
exceeding this value should always be delivered
• MIR (Maximal Information Rate) - themaximal data rate router will provide
• Priority - the order of importance in what traffic will be processed. You can give priority to
some traffic in order it to be handeled before some other traffic
• Contention Ratio - the ratio to which the defined data rate is shared among users (when data
rate is allocated to a number of subscribers). It is the number of subscribers that have a singlespeed limitation, applied to all of them together. For example, the contention ratio of 1:4 means
that the allocated data rate may be shared between no more than 4 users

Page 2 of 22
Copyright 1999-2006, MikroTik. All rights reserved. Mikrotik, RouterOS and RouterBOARD are trademarks of Mikrotikls SIA.
Other trademarks and registred trademarks mentioned herein are properties of theirrespective owners.

/queue interface
/queue tree
/queue interface
Scheduler and Shaper qdiscs

• schedulers - queuing disciplines only reschedule packets regarding their algorithm and drop
packets which 'do not fit in the queue'. Scheduler queuing disciplines are: PFIFO, BFIFO, SFQ,
PCQ, RED
• shapers - queuing disciplines that also perform the limitation. Shapers are PCQ and HTB
VirtualInterfaces

• global-in - represents all the input interfaces in general (INGRESS queue). Please note that
queues attached to global-in apply to traffic that is received by the router, before the packet
filtering. global-in queueing is executed just after mangle and dst-nat
• global-out - represents all the output interfaces in general. Queues attached to it apply before
the ones attached to aspecific interface
• global-total - represents a virtual interface through which all the data, going through the router,
is passing. When attaching a qdisc to global-total, the limitation is done in both directions. For
example, if we set a total-max-limit to 256000, we will get upload+download=256kbps
(maximum)
Introduction to HTB

Page 3 of 22
Copyright 1999-2006, MikroTik. All rightsreserved. Mikrotik, RouterOS and RouterBOARD are trademarks of Mikrotikls SIA.
Other trademarks and registred trademarks mentioned herein are properties of their respective owners.

• queuing discipline (qdisc) - an algorithm that holds and maintains a queue of packets. It
specifies the order of the outgoing packets (it means that queuing discipline can reorder
packets). Qdisc also decides...