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Configuring Quality of Service
Cisco ISA500 Series Integrated Security Appliances Administration Guide 167
4
Configuring LAN Queue Settings
Use the Queue Settings page to configure whether traffic scheduling on Ethernet
interfaces is based on either SP or WRR, or the combination of the two. The
security appliance supports four queues for LAN traffic, Q1 to Q4.
STEP 1 Click Networking > QoS > LAN QoS > Queue Settings.
STEP 2 Specify how to determine LAN traffic in queues.
• Strict Priority (SP): Indicates that traffic scheduling for the selected queue
is based strictly on the queue priority.
• Weighted Round Robin (WRR): Indicates that traffic scheduling for the
selected queue is based strictly on the WRR weights. If WRR is selected, the
predefined weights 8, 4, 2 and 1 are assigned to queues 1, 2, 3 and 4
respectively.
• SP and WRR: Integrates the SP and WRR queues. It applies SP to Q1 and
WRR to other queues (Q2 to Q4). If you choose SP+WRR, the PQ is assigned
to Q1 and the predefined weights 4, 2 and 1 are assigned to Q2, Q3, and Q4
respectively. There is no limit for PQ, indicating that WRR queues may be
starved if PQ is always sending traffic greater than the maximum bandwidth
of the LAN ports.
STEP 3 If needed, enter the description for each queue in the field in the Queue
Description column.
STEP 4 Click Save to apply your settings.
Configuring LAN QoS Classification Methods
Traffic Classification is used to classify traffic through the LAN interfaces to a
given traffic class so that traffic in need of management can be identified.
STEP 1 Click Networking > QoS > LAN QoS > Classification Methods.
STEP 2 Depending on your networking design, choose either Differentiated Services
Code Point (DSCP) or Class of Service (CoS) remarking method for traffic through
all LAN interfaces. When you choose DSCP as the classification method, the
Mapping CoS to LAN Queue feature will be grayed out. In this case, the mapping
relationship between LAN queues and CoS is defined as follows: