Cisco Catalyst 3750 Metro - Page 48

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Catalyst 3750 Metro Switch Command Reference
OL-9645-10
Chapter 2 Catalyst 3750 Metro Switch Cisco IOS Commands
bandwidth
bandwidth
Use the bandwidth policy-map class configuration command to specify or modify the minimum
bandwidth provided to a class belonging to a hierarchical policy map attached to an enhanced-services
(ES) port. Use the no form of this command to return to the default setting.
bandwidth {bandwidth-kbps | percent percent}
no bandwidth
Syntax Description
Defaults No bandwidth is specified.
Command Modes Policy-map class configuration
Command History
Usage Guidelines Use the bandwidth command only in a hierarchical policy map attached to an ES port. This command
is not valid for the class-default class in a physical-level policy map.
Use the bandwidth command when you configure a policy map for a class defined by the class-map
global configuration command. The bandwidth command specifies the minimum bandwidth for traffic
in that class when there is traffic congestion in the switch. If the switch is not congested, the class
receives more bandwidth than you specify with this command. 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.
Note It is important to remember that hard bandwidth guarantees might not be provided and that only relative
bandwidths are assured. That is, class bandwidths are always proportional to the specified percentages
of the port bandwidth. When the link bandwidth is fixed, class bandwidth guarantees are in proportion
to the configured percentages.
bandwidth-kbps Amount of bandwidth in kbps assigned to the class. The range is 200 to 2000000.
Allocate the bandwidth in 100-kbps increments; otherwise, the software rounds
down the bandwidth to the nearest 100-kbps increment.
percent percent Percentage of available bandwidth assigned to the parent class. The range is 1 to
100.
Release Modification
12.1(14)AX This command was introduced.
12.2(25)EY Hierarchical service policies can be applied to inbound traffic received on an
ES port.