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Chapter 6
Meters, queues and IPQoS
E-NIT-CTC-20041213-0013 v0.5
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6.1 Meters and queues
Meters Meters are used to limit the bandwidth for a certain interface.
This is done by setting a drop and a mark rate. How this is done will be discussed
later on in this chapter.
Queues As seen before in “ Mapping to internal class” the SpeedTouch™ supports up to 6
queues. These queues are used to prioritize data. Each queue handles a range of
internal classes. As seen before a packet is associated with an internal class by
means of embedded priority indicators as DSCP, VLAN priority or by defining your
own specific rules.
The table below shows these relations more in detail.
INPUT Mapping OUTPUT
VLAN User
Priority
DiffServ
DSCP
Internal
Class
Queue Default
Label
7 CS6,CS7 15
5 Real Time
6
EF
CS5
14
-
AF41
CS4
13
4WFQ4
-
AF42,AF43
12
-
AF31
CS3
11
3WFQ3
5 AF32,AF33
10
-
AF21
CS2
9
2WFQ2
4 AF22,AF23
8
-
AF11
CS1
7
1WFQ1
3 AF12,AF13
6
--5
0
Best
Effort
0
CS0
Best Effort
4
--3
2-2
--1
1-0