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22-5
ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter 22 Configuring Quality of Service
IP Precedence Based Class of Service (CoS)
For a complete description of the qos mapping precedence command, see the ATM and Layer 3 Switch
Router Command Reference.
Mapping QoS Scheduling at the Interface Level
Configuring the QoS mapping at the interface level overrides the system-level mapping. Using the qos
mapping precedence wrr-weight command, the network administrator can assign different
WRR-scheduling weights for a particular precedence traffic between a pair of interfaces.
To configure QoS scheduling at the interface level, use the following command:
The QoS commands are applicable to both Gigabit Ethernet and Fast Ethernet interfaces.
To set the precedence back to the system-level default setting for the switch router, use the no version
of the qos mapping precedence wrr-weight command.
Both the source and destination interface parameters are optional. When both are not specified, the
system-level QoS mapping is configured. Otherwise, you can specify the source interface, the
destination interface, or both, to configure the WRR weight for the traffic streams listed below.
The configuration takes precedence in the following order:
1. Traffic streams with a certain precedence, from a particular source interface to a particular
destination interface
2. Traffic streams with a certain precedence to a particular destination interface
3. Traffic streams with a certain precedence from a particular source interface
Table 22-2 IP Precedence and Default WRR Weights
IP Precedence WRR Weight
01
12
24
38
Command Purpose
Router(config)# qos mapping [source
source-interface] [destination dest-interface]
precedence value wrr-weight weight
Assigns different WRR-scheduling weights for a
particular precedence traffic between a pair of
interfaces.