3Com Switch 7750 Configuration Guide Guide

Configuring Congestion Avoidance 631
COSQ 4 = 5 packets
COSQ 5 = 10 packets
COSQ 6 = 5 packets
COSQ 7 = 10 packets
Egress port queue statistics(in bytes):
Priority CosQ Threshold Count Used(%):
0 2 18432 0 0
1 0 2560 0 0
2 1 2560 0 0
3 3 2560 0 0
4 4 2560 0 0
5 5 2560 0 0
6 6 2560 0 0
7 7 2560 0 0
common queue statistics(in bytes):
49152 0 0
Configuring
Congestion Avoidance
When congestion happens, the switch will drop packets as soon as possible to
release queue resources and try not to put packets into high-delay queues in order
to eliminate congestion. The switch adopts the RED algorithm for congestion
avoidance.
Configuration
Prerequisites
■ The indexes of queues to be dropped at random, the queue length that starts
the drop action, the queue length that causes all the packets to be dropped
and the drop probability are specified
■ The ports that need this configuration are specified
Configuration Procedure
acl-rule: Applied ACL rules which can be the combination of various ACL rules.
The way of combination is described in
Table 497.
n
■ Only type-A I/O Modules support the configuration above.
■ Only the rules with the permit action can be properly applied to the hardware.
Table 502 Configure RED parameters
Operation Command Description
Enter system view system-view -
Enter Ethernet port view
interface interface-type
interface-number
-
Enter QoS view qos -
Configure parameters for the
RED algorithm
traffic-red outbound
acl-rule [ system-index
system-index ] qstart qstop
probability
Required
The maximum available
bandwidth must be no smaller
than the minimum assured
bandwidth.
Display the parameters for the
RED configuration
display qos-interface [
interface-type
interface-number ] traffic-red
Optional
You can execute the display
command in any view.
Display all the QoS settings on
the port
display qos-interface [
interface-type
interface-number ] all