Configuring Congestion Avoidance - 3Com 7757 Configuration Manual

Configuration Example
Configuring
Congestion Avoidance
Configuration
Prerequisites
n
Only non-type-A I/O Modules support the configuration for queue scheduling
mode.
The switch adopts the WRR queue scheduling algorithm, and the weight values
■
of outbound queues are 10, 5, 10, 10, 5, 10, 5, and 10 respectively;
Display the configuration.
■
Configuration procedure:
<SW7750> system-view
[SW7750] interface GigabitEthernet 2/0/1
[SW7750-GigabitEthernet2/0/1] qos
[SW7750-qosb-GigabitEthernet2/0/1] queue-scheduler wrr 10 5 10 10 5 10 5 10
[SW7750-qosb-GigabitEthernet2/0/1] display qos-interface GigabitEthernet 2/0/1 qu
eue-scheduler
GigabitEthernet2/0/1:
Queue scheduling mode: weighted round robin
weight of queue 1: 10
weight of queue 2: 5
weight of queue 3: 10
weight of queue 4: 10
weight of queue 5: 5
weight of queue 6: 10
weight of queue 7: 5
weight of queue 8: 10
COS configuration:
Config (max queues): 8
Schedule mode: weighted round-robin
Weighting (in packets):
COSQ 0 = 10 packets
COSQ 1 = 5 packets
COSQ 2 = 10 packets
COSQ 3 = 10 packets
COSQ 4 = 5 packets
COSQ 5 = 10 packets
COSQ 6 = 5 packets
COSQ 7 = 10 packets
Egress port queue statistics(in bytes):
Priority
0
1
2
3
4
5
6
7
common queue statistics(in bytes):
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.
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
■
CosQ Threshold
2 18432
0 2560
1 2560
3 2560
4 2560
5 2560
6 2560
7 2560
49152

Configuring Congestion Avoidance

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