Networking
Configuring Quality of Service
Cisco ISA500 Series Integrated Security Appliances Administration Guide 157
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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:
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 R ound
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)
The default setting, Low Latency Queuing (LLQ) allows
delay-sensitive data (such as voice) to be given
preferential treatment over other traffic by sending it
first. You can enter the PQ for Q1 and a description for
each queue. By default the PQ is 1200 Kbps. The
Queue Descriptions are:
Q1—Voi ce t raf fi c
Q2—Signaling
Q3—Routing/VPN control
Q4—Management
Q5—Video
Q6—Best Effort