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23-10
Cisco ASA Series Firewall ASDM Configuration Guide
Chapter 23 Configuring QoS
Configuring QoS
Step 4 Click Finish. The service policy rule is added to the rule table.
Step 5 To configure policing, configure a service policy rule for the same interface in the Configuration >
Firewall > Service Policy Rules pane according to Chapter 1, “Configuring a Service Policy.”
For policing traffic, you can choose to police all traffic that you are not prioritizing, or you can limit the
traffic to certain types.
Step 6 In the Rule Actions dialog box, click the QoS tab.
Step 7 Click Enable policing, then check the Input policing or Output policing (or both) check boxes to
enable the specified type of traffic policing. For each type of traffic policing, configure the following
fields:
• Committed Rate—The rate limit for this traffic flow; this is a value in the range 8000-2000000000,
specifying the maximum speed (bits per second) allowed.
• Conform Action—The action to take when the rate is less than the conform-burst value. Values are
transmit or drop.
• Exceed Action—Take this action when the rate is between the conform-rate value and the
conform-burst value. Values are transmit or drop.
• Burst Rate—A value in the range 1000-512000000, specifying the maximum number of
instantaneous bytes allowed in a sustained burst before throttling to the conforming rate value.
Step 8 Click Finish. The service policy rule is added to the rule table.
Step 9 Click Apply to send the configuration to the device.
Configuring a Service Rule for Traffic Shaping and Hierarchical Priority
Queuing
You can configure traffic shaping for all traffic on an interface, and optionally hierarchical priority
queuing for a subset of latency-sensitive traffic.
Guidelines
• One side-effect of priority queuing is packet re-ordering. For IPsec packets, out-of-order packets
that are not within the anti-replay window generate warning syslog messages. These warnings are
false alarms in the case of priority queuing. You can configure the IPsec anti-replay window size to
avoid possible false alarms. See the Configuration > VPN > IPsec > IPsec Rules > Enable
Anti-replay window size option in the “Adding Crypto Maps” section on page 3-10 in the VPN
configuration guide.
• For hierarchical priority queuing, you do not need to create a priority queue on an interface.
Restrictions
• For hierarchical priority queuing, for encrypted VPN traffic, you can only match traffic based on the
DSCP or precedence setting; you cannot match a tunnel group.
• For hierarchical priority queuing, IPsec-over-TCP traffic is not supported.
• Traffic shaping is only supported on the ASA 5505, 5510, 5520, 5540, and 5550. Multi-core models
(such as the ASA 5500-X) do not support shaping.