Cisco MWR 2941 Installation Manual Page 14

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Cisco MWR 2941 Mobile Wireless Edge Router Release 3.5 Command Reference, Cisco IOS Release 15.1(3)MR
OL-26895-01
Chapter Cisco MWR 2941 Router Command Reference, Release 15.1(3)MR
bandwidth (policy-map class)
Usage Guidelines Configuring a Policy Map
Use the bandwidth command when you configure a policy map for a class defined by the class-map
command. The bandwidth command specifies the bandwidth for traffic in that class. Class-based
weighted fair queueing (CBWFQ) derives the weight for packets belonging to the class from the
bandwidth allocated to the class. CBWFQ then uses the weight to ensure that the queue for the class is
serviced fairly.
Configuring Strict Priority with Bandwidth
You can configure only one class with strict priority. Other classes cannot have priority or bandwidth
configuration. To configure minimum bandwidth for another class, use the bandwidth remaining
percent command.
Specifying Bandwidth as a Percentage
Besides specifying the amount of bandwidth in kilobits per second (kbps), you can specify bandwidth
as a percentage of either the available bandwidth or the total bandwidth. During periods of congestion,
the classes are serviced in proportion to their configured bandwidth percentages. The bandwidth
percentage is based on the interface bandwidth or when used in a hierarchical policy. Available
bandwidth is equal to the interface bandwidth minus the sum of all bandwidths reserved by the Resource
Reservation Protocol (RSVP) feature, the IP RTP Priority feature, and the low latency queueing
(LLQ)
feature.
Note It is important to remember that when the bandwidth remaining percent command is configured, hard
bandwidth guarantees may not be provided and only relative bandwidths are assured. That is, class
bandwidths are always proportional to the specified percentages of the interface bandwidth. When the
link bandwidth is fixed, class bandwidth guarantees are in proportion to the configured percentages. If
the link bandwidth is unknown or variable, the router cannot compute class bandwidth guarantees in
kbps.
12.2SX This command is supported in the Cisco IOS Release 12.2SX train. Support
in a specific 12.2SX release of this train depends on your feature set,
platform, and platform hardware.
12.2(31)SB6 This command was enhanced to specify an offset size when calculating ATM
overhead and was implemented on the Cisco 10000 series router for the
PRE3.
12.2(33)SRC Support for the Cisco 7600 series router was added.
12.2(33)SB Support for the Cisco 7300 series router was added.
12.4(20)T Support was added for hierarchical queueing framework (HQF) using the
Modular Quality of Service (QoS) Command-Line Interface (CLI) (MQC).
Cisco IOS XE
Release 2.1
This command was implemented on Cisco ASR 1000 series routers.
12.4(20)MR This command was integrated into Cisco IOS Release 12.4(20)MR.
12.2(33)MRA This command was integrated into Cisco IOS Release 12.2(33)MRA.
15.0(1)MR This command was integrated into Cisco IOS Release 15.0(1)MR.
15.1(3)MR This command was integrated into Cisco IOS Release 15.1(3)MR.
Release Modification
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