3Com Switch 8800 Advanced Software V5 Configuration Guide

848 CHAPTER 63: HARDWARE-BASED CONGESTION MANAGEMENT CONFIGURATION
WRR Queuing Weighted round robin (WRR) queues include:
■ Basic WRR queues: a basic WRR queue contains multiple queues. You can
configure weight, percentage or byte count for each queue and WRR
schedules these queues based on the user-defined parameters.
■ Group-based WRR queues: all the queues in a group-based WRR queue are
scheduled in the mix of WRR queue scheduling algorithm and SP queue
scheduling algorithm. You can allocate all an output queue to WRR priority
queue group 1, WRR priority queue group 2, or SP queue group as required.
Queues are scheduled as follows: each group selects a candidate queue
according to its own queue scheduling algorithm, and then the three candidate
queues are scheduled using the SP algorithm.
■ WRR queues with the maximum delay: the queue scheduling algorithm for
WRR queues with the maximum delay is similar to that for the basic WRR
queues except that the WRR queues with the maximum delay assure that
packets in the queue with the highest priority are transmitted through the
queue within the specified maximum delay.
n
Currently, Switch 8800s support only group-based WRR queues.
Configuring SP
Queues
Configuration Procedure Follow these steps to configure SP queues:
Configuration Examples Network requirements
Configure SP queuing on Ethernet 1/1/1.
Configuration procedure
# Enter system view.
<Sysname> system-view
# Configure SP queues on Ethernet 1/1/1.
[Sysname]interface ethernet 1/1/1
[Sysname-Ethernet1/1/1] qos sp
To do... Use the command... Remarks
Enter system view system-view -
Enter
Ethernet
interface
view or
port group
view
Enter
Ethernet
interface
view
interface interface-type
interface-number
Use either the command
Configured in Ethernet interface
view, the setting is effective on
the current interface only;
configured in port group view,
the setting is effective on all the
ports in the port group.
Enter port
group view
port-group { manual
port-group-name | aggregation
agg-id }
Configure SP queues qos sp Optional
Display SP queuing
information
display qos sp interface [
interface-type interface-number
]
Optional
Available in any view