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Configuring Layer 3 QoS
To configure per-port input rate limiting at the interface level, perform the following tasks, beginning
in interface configuration mode:
Task
Step 1
Assign different rate limits on a per-physical port basis.
The first parameter specifies the mean rate, and the
second parameter is the burst size.
Step 2
Return to privileged EXEC mode.
Step 3
Display the interface configuration to verify changes.
The per-port QoS traffic-conditioning commands are applicable to the Gigabit Ethernet interfaces.
To disable the input rate limiting, use the no version of the rate-limit input command.
The following example shows you how to configure per-port input rate limiting:
Router(config)# interface g3
Router(config-if)# rate-limit input 32000 100
Router(config-if)# end
Router#
Configuring Per-port Shaping
The per-port shaping feature allows you to shape down the output of a port. The output traffic rate of
the port is monitored by the module to verify the traffic that leaves the interface at the user-configured
shaping rate. When excess traffic comes into the switch, back pressure is applied from the modules to
switch fabric. Excess traffic gets queued in the switch fabric. If the switch fabric queues overflow, the
traffic is dropped. The per-port shaping feature applies to the whole output traffic and does not
differentiate between various kinds of traffic.
You cannot configure both per-port, output-side rate-limiting and shaping on an interface
Note
at the same time.
To configure per-port traffic shaping at the interface level, perform the following tasks, beginning in
interface configuration mode:
Task
Step 1
Assign different traffic shaping rate limits on a
per-physical port basis. The first parameter specifies the
mean rate, and the second parameter is the burst size.
Step 2
Return to privileged EXEC mode.
Step 3
Display the interface configuration to verify changes.
The per-port QoS traffic-shaping commands are applicable to the Gigabit Ethernet interfaces.
To disable per-port traffic shaping, use the no version of the traffic-shape rate command.
Installation and Configuration Note for the Catalyst 4000 Layer 3 Services Module
72
Command
Router (config-if) # rate-limit input
{32000-100000000} {0-64000}
Router (config-if) # end
Router (config) # show run interface
{interface_name}
Command
Router (config-if) # traffic-shape rate
{32000-100000000} {0-512000}
Router (config-if) # end
Router (config) # show run interface
{interface_name}
78-10164-03
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