29-46
Catalyst 3550 Multilayer Switch Software Configuration Guide
78-11194-09
Chapter 29 Configuring QoS
Configuring Standard QoS
Step 10
police rate-bps burst-byte [exceed-action
{drop | policed-dscp-transmit}]
Define a policer for the classified traffic.
You can configure up to 128 policers on ingress Gigabit-capable
Ethernet ports, up to 8 policers on ingress 10/100 Ethernet ports, and
up to 8 policers on egress ports.
• For rate-bps, specify average traffic rate in bits per second (bps).
The range is 8000 to 2000000000.
• For burst-byte, specify the normal burst size in bytes. The range is
8000 to 512000000.
Note Although the command-line help strings show a large range of
values, the rate-bps option cannot exceed the configured port
speed, and the burst-byte option cannot exceed 2000000 bytes.
If you enter a larger value, the switch rejects the policy map
when you attach it to an interface.
• (Optional) Specify the action to take when the rates are exceeded.
Use the exceed-action drop keywords to drop the packet. Use the
exceed-action policed-dscp-transmit keywords to mark down the
DSCP value (by using the policed-DSCP map) and send the packet.
For more information, see the “Configuring the Policed-DSCP
Map” section on page 29-53.
Step 11
exit Return to policy map configuration mode.
Step 12
exit Return to global configuration mode.
Step 13
interface interface-id Enter interface configuration mode, and specify the interface to attach
to the policy map.
Valid interfaces include physical interfaces.
Step 14
service-policy {input policy-map-name |
output policy-map-name}
Apply a policy map to the input or output of a particular interface.
Only one policy map per interface per direction is supported.
• Use input policy-map-name to apply the specified policy-map to
the input of an interface.
• Use output policy-map-name to apply the specified policy-map to
the output of an interface.
You cannot use the service-policy interface configuration command to
attach policy maps that contain these elements to an egress interface:
• set or trust policy-map class configuration commands. Instead,
you can use the police policy-map class configuration command to
mark down (reduce) the DSCP value at the egress interface.
• Access control list (ACL) classification.
• Per-port per-VLAN classification.
The only match criterion in a policy map that can be attached to an
egress interface is the match ip dscp dscp-list class-map configuration
command.
Per-port per-VLAN policing is not supported on routed ports or on
virtual (logical) interfaces.
Command Purpose
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