Configuring Congestion Management on a Stack Interface (Interface Mode)
Pre-configuration Tasks
Configure congestion management on a stack interface when the network intermittently becomes congested. Once congestion management is configured, the sequence at which packets are forwarded is determined according to the defined scheduling policy. High-priority services are scheduled preferentially.
- Perform the stack configuration.
- Configure priority mapping on inbound interface of packets.
Context
After the stack is configured, stack protocol packets and packets between chassis are exchanged on the stack interface. If a large number of packets are exchanged, congestion may occur on the stack interface. As a result, core services such as video services and voice services cannot be processed in a timely manner. You can set the scheduling mode on the stack interface so that services with the same priority are processed in the same manner and services with different priorities are processed based on weights.
Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S5735-L, S5735S-L, S5735S-L-M, S5735-S, S5735S-S, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support congestion management on a stack interface in interface mode.
Procedure
- Run system-view
The system view is displayed.
- Run stack-port qos { pq | wrr | drr }
The scheduling mode of queues on the stack interface is set to PQ, WRR, or WDRR.
By default, PQ is used.
The S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-HI, S6730-H, S6730S-H, S6730-S, and S6730S-S do not support WRR scheduling mode.
- Run stack-port qos queue queue-index { wrr | drr } weight weight
The WRR or WDRR weight of queues on the stack interface is set.
When using WRR or WDRR scheduling, you can set the weight for each queue. Then the device schedules queues in turn based on the weights. If the weight of a queue is set to 0, the queue uses PQ scheduling. In this case, PQ+WRR or PQ+WDRR is used.
The WRR weight of queues cannot be set on the stack interface of the S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-HI, S6730-H, S6730S-H, S6730-S, and S6730S-S.
Verifying the Configuration
Run the display qos configuration interface [ interface-type interface-number ] command to check all the QoS configurations on the interface.
Run the display qos queue statistics interface interface-type interface-number [ queue queue-index ] command to view queue-based traffic statistics on the interface.