Cisco ASA 5505 Configuration Manual page 1063

Chapter 49 Configuring QoS
You cannot configure traffic shaping and standard priority queueing for the same interface; only
hierarchical priority queueing is allowed. For example, if you configure standard priority queueing for
the global policy, and then configure traffic shaping for a specific interface, the feature you configured
last is rejected because the global policy overlaps the interface policy.
Typically, if you enable traffic shaping, you do not also enable policing for the same traffic, although the
adaptive security appliance does not restrict you from configuring this.
DSCP and DiffServ Preservation
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Configuring QoS
This section includes the following topics:
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Creating the Standard Priority Queue for an Interface
If you enable standard priority queueing for traffic on a physical interface, then you need to also create
the priority queue on each interface. Each physical interface uses two queues: one for priority traffic,
and the other for all other traffic. For the other traffic, you can optionally configure policing.
The standard priority queue is not required for hierarchical priority queueing with traffic shaping; see
Note
the
You cannot create a priority queue for a Ten Gigabit Ethernet interface; priority queuing is not necessary
for an interface with high bandwidth.
This section includes the following topics:
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OL-20339-01
DSCP markings are preserved on all traffic passing through the adaptive security appliance.
The adaptive security appliance does not locally mark/remark any classified traffic, but it honors the
Expedited Forwarding (EF) DSCP bits of every packet to determine if it requires "priority" handling
and will direct those packets to the LLQ.
DiffServ marking is preserved on packets when they traverse the service provider backbone so that
QoS can be applied in transit (QoS tunnel pre-classification).
Creating the Standard Priority Queue for an Interface, page 49-5
Creating a Policy for Standard Priority Queueing and/or Policing, page 49-7
Creating a Policy for Traffic Shaping and Hierarchical Priority Queueing, page 49-8
"Information About Priority Queueing" section on page 49-3
Determining the Queue and TX Ring Limits, page 49-6
Configuring the Priority Queue, page 49-7
for more information.
Cisco ASA 5500 Series Configuration Guide using ASDM
Configuring QoS
49-5