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Cisco ME 3800X and 3600X Switch Software Configuration Guide
OL-23400-01
Chapter 27 Configuring QoS
Configuring QoS
After you have created an output policy map, you attach it to an egress port. See the
“Attaching a Service
Policy to an Interface or EFP” section on page 27-56
. Use the no form of the appropriate command to
delete an existing policy map or class map or to delete a WTD configuration.
Note
If the device connected to a 10/100/1000 Mb/s interface starts bursting the traffic more than the 1 Gigabit
line rate because of multicast replication, you should increase the queue-limit for the policy map class
applied to the interface to 48000 (48 K) bytes because the interface cannot handle the excess burst.
This example shows a policy map with a specified bandwidth and queue size. Traffic that is not DSCP 30
or 10 is assigned a qu
Step 5
queue-limit [cos value | discard-class value |
dscp value | exp value | precedence value |
qos-group value] | limit [bytes | us]]
Note
Although visible in the command-line
help, the packets keyword is not
supported.
Specify the queue size for the traffic class.
•
(Optional) For cos value, specify a CoS value. The range is
from 0 to 7.
•
(Optional) Enter discard-class value
to specify the drop
precedence for a packet during congestion management. The
range is 0 to 7.
•
(Optional) For dscp value, specify a DSCP value. The range
is from 0 to 63.
•
(Optional) For exp value, specify an MPLS experimental
value. The range is from 0 to 7.
•
(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 bytes bytes, enter the maximum threshold in bytes. The
range is from 200 to 491520. The default depends on the
interface speed.
On 10/100/1000 Mb/s interfaces, the default is 12000 (12 K)
bytes. On 10 Gb/s interfaces, the default is 12 0000 (120 K)
bytes.
•
For us microseconds, enter the maximum threshold in
microseconds. This is the default for specifying threshold.
The range is from 1 to 3932. The default depends on the
interface speed.
On 10 Mb/s interfaces, the default is 10000 us. On 100 Mb/s
interfaces, the default is 1000 us. On 1000 Mb/s and 10 Gb/s
interfaces, the default is 100 us.
•
If you do not enter bytes bytes or us microseconds, the
default is us.
Step 6
end
Return to privileged EXEC mode.
Step 7
show policy-map [policy-map-name [class
class-map-name]]
Verify your entries.
Step 8
copy running-config startup-config
(Optional) Save your entries in the configuration file.
Command
Purpose
