Networking
Configuring Quality of Service
Cisco ISA500 Series Integrated Security Appliances Administration Guide
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Configuring WAN Queue Settings
Use the Queue Settings page to determine how traffic in queues is handled for
each WAN port. The security appliance supports six queues for the WAN ports,
Q1 to Q6. There are three ways of determining how traffic in queues is handled:
STEP 1
Click
Networking > QoS > WAN QoS > Queue Settings
.
STEP 2
Specify the way of determining how traffic in queues is handled for each WAN
port.
•
Strict Priority (SP):
Set the order in which queues are serviced, traffic
scheduling for the selected queue and all higher queues is based strictly on
the queue priority, starting with Q1 (the highest priority queue) and going to
the next lower queue when each queue is complete.
•
Weighted Round Robin (WRR):
Enter the WRR weight, in percentage,
assigned to the queues that you want to use. Traffic scheduling for the
selected queue is based on WRR.
Strict Priority (SP)
Egress traffic from the highest-priority queue (Q1) is
transmitted first. Traffic from the lower queues is
processed only after the highest queue has been
transmitted, thus providing the highest level of priority
of traffic to the highest numbered queue.
Weighted Round
Robin (WRR)
Distributes the bandwidth between the classes using
the weighted round robin scheme. The weights decide
how fast each queue can send packets. In WRR mode
the number of packets sent from the queue is
proportional to the weight of the queue. The higher the
weight, the more frames are sent.
Low Latency
Queuing (LLQ)
Integrates the SP and WRR queues to provide Strict
Priority Queuing (PQ) to Class-Based Weighted Fair
Queuing (CBWFQ). LLQ allows delay-sensitive data
(such as voice) to be given preferential treatment over
other traffic by letting the data to be de-queued and
sent first.
