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Configuring Layer 3 QoS
Use the following command syntax to configure QoS scheduling at the system level:
•
•
To set the precedence back to the default setting for the Catalyst 4000 Layer 3 Services module, use the
no version of the qos mapping precedence command.
Table 13 shows the default WRR weights for IP precedence.
Table 13
IP Precedence
0
1
2
3
Mapping QoS Scheduling at the Interface Level
Configuring QoS mapping at the interface level overrides the system-level mapping. By using the qos
mapping precedence wrr-weight command, you can assign different WRR-scheduling weights for
traffic destined to any particular interface.
To configure QoS scheduling at the interface level, perform the following tasks in interface
configuration mode:
Task
Step 1
Assign a different WRR-scheduling weight for a
particular precedence traffic destined to an interface.
Step 2
Return to privileged EXEC mode.
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 Catalyst 4000 Layer 3 Services
module, use the no version of the qos mapping precedence wrr-weight command.
The destination interface parameter is optional. When the destination interface parameter is not
specified, system-level QoS mapping is configured. If interface-specific QoS mapping is configured for
a certain precedence, it takes priority over the system-level QoS mapping for that precedence.
Configuring Per-Port Traffic Conditioning
This section describes the Cisco IOS commands that you need to configure per-port QoS traffic
conditioning at the interface level. The commands described in this section are unique to Layer 3
switching software. The Catalyst 4000 Layer 3 Services module supports per-port input rate limiting,
output rate limiting, and traffic shaping.
Installation and Configuration Note for the Catalyst 4000 Layer 3 Services Module
70
value—The precedence value (0 to 3) is the higher 2 bits of the IP precedence field.
weight—The WRR-scheduling weight (1 to 4). This parameter specifies the weight assigned to
traffic with the given precedence.
Default WRR Weights for IP Precedence
WRR Weight
1
2
3
4
Command
Router (config) # qos mapping
destination dest-interface
[
value wrr-weight weight
Router (config) # Ctrl-Z
precedence
]
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