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•
Low latency queuing (LLQ)—LLQ queues are EF queues, and ensure strict priority service for
real-time traffic. CBQ always schedules traffic in LLQ queues preferentially. To guarantee that
other queues can get served when congestion occurs, you can set the maximum bandwidth for
each LLQ queue. In normal cases, an LLQ queue can use more bandwidth than allocated.
When congestion occurs, the exceeding traffic is dropped. You can also configure a burst size
for LLQ queues.
•
Bandwidth queuing (BQ)—BQ queues are AF queues. BQ provides strict, exact, guaranteed
bandwidth for AF traffic, and schedules the AF classes proportionally.
•
WFQ—One WFQ queue is available for BE traffic, and uses the remaining bandwidth to send
the BE traffic.
BQ and WFQ use tail drop by default. You can configure a WRED drop policy to limit traffic.
Hardware congestion management configuration
approaches
To manage hardware congestion, you can do the following:
•
Configure queue scheduling for each queue in interface view or port group view, as described
in
Configuring per-queue hardware congestion
•
Configure queue scheduling in a QoS policy, as described in
Complete the following tasks to achieve hardware congestion management:
Task
Configuring per-queue hardware
congestion management
Configuring CBQ
Configuring per-queue hardware congestion
management
Configuring SP queuing
Configuration procedure
Step
1.
Enter system view.
2.
Enter interface view or
port group view.
Configuring SP queuing
Configure group-based WRR queuing
Configuring WFQ queuing
Command
system-view
•
Enter interface view:
interface interface-type
interface-number
•
Enter port group view:
port-group manual
port-group-name
69
management.
Configuring
Remarks
N/A
SP queuing is only applicable to Layer
2 interfaces.
Settings in interface view take effect on
the current interface. Settings in port
group view take effect on all ports in the
port group.
CBQ.
Remarks
Optional.
Optional.
Optional.
Optional.
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