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Chapter 4
IP QoS Framework Overview
E-NIT-CTC-20041213-0013 v0.5
28
Mapping to internal
class
The RM module maps packets to the an internal class depending on ATM QoS, VLAN
priority or DSCP settings. The table below shows the relation between these
settings. Once the mapping to the internal classes has been completed the packet
goes through a number of processes like firewall, nat etc. Finally once the packet is
ready for output it will be put in one of the 6 queues based upon its internal class.
INPUT
Mapping OUTPUT
ATMQoS
Category
VLAN User
Priority
DiffServ
DSCP
Internal
Class
Queue Label
CBR 7 CS6,CS7
15
5
Real
Time
VBR-rt 6
EF
CS5
14
VBR-nrt
(low CDVT)
-
AF41
CS4
13
4WFQ4
GFR
(low CDVT)
-
AF42,AF4
3
12
VBR-nrt
(high CDVT)
-
AF31
CS3
11
3WFQ3
GFR
(high CDVT)
5
AF32,AF3
3
10
--
AF21
CS2
9
2WFQ2
-4
AF22,AF2
3
8
UBR BCS 7 -
AF11
CS1
7
1WFQ1
ABR /UBR
BCS 6
3
AF12,AF1
3
6
UBR-mdcr /
UBR BCS 5
--
5
0
Best
Effort
UBR / UBR
BCS 4
0
CS0
Best Effort
4
UBR BCS 3 - - 3
UBR BCS 2 2 - 2
UBR BCS 1 - - 1
UBR BCS 0 1 - 0