Alcatel-Lucent 6850-48 ネットワークガイド

Configuring QoS

QoS Ports and Queues

OmniSwitch AOS Release 6 Network Configuration Guide

page 40-27

• The qos port servicing mode command overrides the default servicing mode configured with the qos 

default servicing mode command.

• Once the qos port servicing mode command is used on a port, this same command is required to make 

any additional mode changes for that port. If the port is changed back to the default servicing mode, 
however, this restriction is removed and the qos default servicing mode command is also allowed on 
the port.

Bandwidth shaping is configured on a per port basis. Bandwidth policing is applied using QoS policies 
(see 

 and 

 for 

more information).

QoS supports configuring maximum bandwidth on ingress and egress ports. However, on the OmniSwitch 
6400, 6850, 6855, and 9000 switches, configuring minimum and maximum egress bandwidth is supported 
on a per COS queue basis for each port (see 

 for more information).

To limit the ingress or egress bandwidth for a QoS port, use the 

 commands. For example,

-> qos port 1/1 maximum egress-bandwidth 10M

-> qos port 1/1 maximum ingress-bandwidth 5M

Note the following when configuring the ingress or egress bandwidth limit for a port:

• Maximum bandwidth limiting is done using a granularity of 64K bps. Any value specified that is not a 

multiple of 64K is rounded up to the next highest multiple of 64K.

• The maximum bandwidth value cannot exceed the maximum bandwidth of the interface type associ-

ated with the port.

• Modifying the maximum bandwidth is most useful for low-bandwidth links.

• The bandwidth limit configured using the 

 command takes 

precedence over an egress queue limit configured on the same port.

• Configuring the maximum ingress bandwidth value is not supported on an OmniSwitch 6800.

Configuring a minimum and maximum bandwidth value for each of the eight egress port queues is 
allowed on the OmniSwitch 6400, 6850, 6855, and 9000 but is not supported on the OmniSwitch 6800. By 
default the bandwidth values are set to zero, which means best effort for the minimum bandwidth and port 
speed for the maximum bandwidth.

To configure the bandwidth values use the 

 command. For example, the follow-

ing command sets the minimum and maximum bandwidth for queue 8 on port 2/10 to 2k and 10k:

-> qos port 2/10 q8 minbw 2k q8 maxbw 10k

Note that specifying both the minimum and maximum bandwidth value is allowed on the same command 
line. Configuring the bandwidth values for different queues requires a separate command for each queue.