22-5
ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter22 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 sourc e 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
Table22-2 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-weightweight
Assigns different WRR-scheduling weights for a
particular precedence traffic between a pair of
interfaces.