QoS Configuration
Port Priority
Context
The switch performs priority mapping based on the priority of packets or priority of an interface. Then the switch determines the queues and output priorities of the received packets based on packet priorities or the priority of the interface. By doing this, the switch provides differentiated services.
Procedure
- Choose and click the Port Priority tab, as shown in Figure 5-205.
- Select a port to be configured. Perform the following operations as required in the port area:
- Click a port icon. To deselect the port, click the port icon again.
- Drag the cursor to select consecutive ports in a batch.
- Click multiple port icons to select these ports, and click a port icon again to deselect the port.
- Select a slot where an LPU is located. All ports on the LPU are selected.
- Select the interface priority from the Default port priority drop-down list box.
- Select the trusted priority from the Trusted port priority drop-down list box. Then the switch maps packets based on the priority.
- 8021p: The switch maps packets based on the 802.1p priority.
- 8021p-inner: The switch maps packets based on the inner 802.1p priority.
- 8021p-outer: The switch maps packets based on the outer 802.1p priority.
- DSCP: The switch maps packets based on the DSCP priority.
- None: The switch does not trust any packet priorities.
- Click Apply.
Congestion Management
Context
When congestion occurs on a network, the switch configured with congestion management determines the sequence at which packets are forwarded based on the defined scheduling policy and ensures that high-priority packets are scheduled preferentially.
Procedure
- Choose and click the Congestion Management tab, as shown in Figure 5-206.
- Select a port to be configured. Perform the following operations as required in the port area:
- Click a port icon. To deselect the port, click the port icon again.
- Drag the cursor to select consecutive ports in a batch.
- Click multiple port icons to select these ports, and click a port icon again to deselect the port.
- Select a slot where an LPU is located. All ports on the LPU are selected.
- Configure a queue scheduling mode on an interface in Scheduling method.
- Set the weight of each queue.
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.
- Set the weight of each queue.
- Click Apply.
Rate Limiting And Shaping
Context
Interface-based rate limiting limits the rate of all packets passing through the interface to ensure that the bandwidth is within the allowed range. Packets received on an interface enter different queues based on priority mapping. The switch provides differentiated services by setting different traffic shaping parameters for queues with different priorities.
Procedure
- Choose and click the Rate Limiting And Shaping tab, as shown in Figure 5-207.
- Select a port to be configured. Perform the following operations as required in the port area:
- Click a port icon. To deselect the port, click the port icon again.
- Drag the cursor to select consecutive ports in a batch.
- Click multiple port icons to select these ports, and click a port icon again to deselect the port.
- Select a slot where an LPU is located. All ports on the LPU are selected.
- Set Outbound rate limit(Kbps).
The value ranges from 64 to 1000000.
- Set the traffic shaping value corresponding to the queue
index ID in Outbound queue shaping.
The value ranges from 64 to 1000000.
- Click Apply.
