Alcatel-Lucent 6850-48 ネットワークガイド

Configuring QoS

Configuring Global QoS Parameters

OmniSwitch AOS Release 6 Network Configuration Guide

page 40-15

The servicing mode refers to the queuing scheme used to shape traffic on destination (egress) ports. There 
are three schemes available: one strict priority and two weighted fair queueing (WFQ) options. By default 
all switch ports are set to use strict priority queuing.

 command is used to set the default queuing scheme for all switch ports. 

For example, the following command selects wrr—a WFQ scheme that uses 8 weighted round robin 
(WRR) queues—as the default servicing mode:

-> qos default servicing mode wrr

For more information about the available queuing schemes and configuring the servicing mode for indi-
vidual ports, see 

.

Automatic QoS prioritization refers to prioritizing certain subsets of switch traffic without having to 
configure a specific QoS policy to do the same for each type of traffic. This functionality is currently 
available for Network Management System (NMS) traffic and IP phone traffic. Note that automatic priori-
tization is not supported on the OmniSwitch 6800.

This section describes how to configure the automatic prioritization of NMS and IP phone traffic. The 
status of automatic NMS and IP phone prioritization for the switch is displayed through the show qos 
config command. For more information about this command, see the OmniSwitch CLI Reference Guide.

Prioritizing NMS traffic destined for the switch helps to maximize NMS access to the switch and reduce 
the risk of DoS attacks. The following types of traffic are considered NMS traffic:

• SSH (TCP Port 22)

• Telnet (TCP Port 23)

• WebView (HTTP Port 80)

• SNMP (UDP port 161)

 command is used to enable or disable the automatic prioritization of NMS traffic. 

This functionality is enabled for the switch by default. To disable automatic prioritization, use the no form 
of the qos nms priority command. For example:

-> qos no nms priority

Note the following when configuring the status of automatic NMS traffic prioritization:

• Only the NMS traffic associated with the first eight active IP interfaces is prioritized; any such traffic 

from additional interfaces is not prioritized.

• The precedence of an active IP interface is determined by the value of the SNMP interface index (ifin-

dex), which was assigned to the interface when it was created. The lower the ifindex value the higher 
the precedence; the higher the ifindex value the lower the precedence. Therefore, the eight IP inter-
faces with the lowest ifindex values are eligible for automatic prioritization of NMS traffic.

• To change the precedence of an IP interface, use the ip interface ifindex command and specify a 

higher (lower precedence) or lower (higher precedence) ifindex value.