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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-07
Chapter 33 Configuring QoS
Configuring QoS
After you have created an output policy map, you attach it to an egress port. See the “Configuring Output
Policy Maps” section on page 33-52.
Use the no form of the appropriate command to delete an existing policy map or class map or to delete
a WTD configuration.
Step 5
queue-limit [cos value | dscp value | precedence
value | qos-group value] number-of-packets
[packets]}
Specify the queue size for the traffic class.
• (Optional) For cos value, specify a CoS value. The range is
from 0 to 7.
• (Optional) For dscp value, specify a DSCP value. The range
is from 0 to 63.
• (Optional) For precedence value, specify an IP precedence
value. The range is from 0 to 7.
• (Optional) For qos-group value, enter a QoS group value.
The range is from 0 to 99.
• For number-of-packets, set the minimum threshold for WTD.
The range is from 16 to 544, in multiples of 16, where each
packet is a fixed unit of 256 bytes.
Note For optimal performance, we strongly recommend that
you configure the queue-limit to 272 or less.
The value is specified in packets by default, but the packets
keyword is optional.
Note Multiple output policy maps can use the same queue-limit
configuration. However these policy maps can have only
three unique queue-limit configurations.
Step 6
exit Return to policy-map configuration mode.
Step 7
exit Return to global configuration mode.
Step 8
interface interface-id Enter interface configuration mode for the interface to which you
want to attach the policy.
Step 9
service-policy output policy-map-name Attach the policy map (created in Step 2) to the egress interface.
Note If you try to attach an output policy map that contains a
fourth queue-limit configuration, you see an error
message, and the attachment is not allowed.
Step 10
end Return to privileged EXEC mode.
Step 11
show policy-map [policy-map-name [class
class-map-name]]
Verify your entries.
Step 12
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
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