3Com 7750 Series ,

3Com Switch 7750 Series

Command Reference Guide – QoS Chapter 1 QoS Commands

1-25

 Note:

Assume there are N flows on a port, the bandwidth of the port is Bp, the minimum

guaranteed bandwidth of the ith flow is Bimin, and the maximum guaranteed bandwidth

of the ith flow is Bimax, and the weight is Wi. If the bandwidth occupied by all the flows

is greater than their minimum guaranteed bandwidth, and the sum of maximum

guaranteed bandwidth is greater than port bandwidth Bp, the bandwidth allocated to

the ith flow is Bi= Bimin+(Bp-

∑

Bmin )*Wi/

∑

Wi .

Description

Use the traffic-bandwidth command to activate the ACL for traffic identifying and

provide bandwidth guarantee for the corresponding traffic. This command is applicable

to only the permit rule).

Use the undo traffic-bandwidth command to remove this function.

This configuration provides the minimum guaranteed bandwidth and maximum

available bandwidth for the specific traffic. Note that the maximum available bandwidth

must be no smaller than the minimum guaranteed bandwidth.

Related command: display qos-interface traffic-bandwidth.

 Note:

z Only type-A LPUs support this command.

z Only the permit rule can be referenced in this command and applied to hardware.

Example

# Guarantee the bandwidth of the packets that match the permit rule in ACL 2000: The

minimum guaranteed bandwidth is 64 k, the maximum available bandwidth is 128 k,

and bandwidth weight is 50.

<3Com> system-view

[3Com] interface Ethernet1/0/1

[3Com-Ethernet1/0/1] qos

[3Com-qoss-Ethernet1/0/1] traffic-bandwidth outbound ip-group 2000 64 128 50