HP 445946-001 - Manual (Page 91)

Quality of Service
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ACL Metering and Re-marking
You can define a profile for the aggregate traffic flowing through the HP 10GbE switch, by configuring a
QoS meter (if desired), and assigning ACL Groups to ports. When you add ACL Groups to a port, make
sure they are ordered correctly in terms of precedence.
For example, consider two ACL Groups, ACL Group 1 and ACL Group 2. Each contains three levels of
precedence. If you add ACL Group 1 to a port, then add ACL Group 2 to the port, the port’s ACL filters
contain a total of six precedence levels. ACL Group 1 has precedence over ACL Group 2.
Each port supports up to seven precedence levels.
Actions taken by an ACL are called In-Profile actions. You can configure additional In-Profile and Out-of-
Profile actions on a port. Data traffic can be metered, and re-marked to ensure that the traffic flow
provides certain levels of service in terms of bandwidth for different types of network traffic.
Metering
QoS metering provides different levels of service to data streams through user-configurable parameters. A
meter is used to measure the traffic stream against a traffic profile, which you create. Thus, creating
meters yields In-Profile and Out-of-Profile traffic for each ACL, as follows:
• In-Profile—If there is no meter configured or if the packet conforms to the meter, the packet is
classified as In-Profile.
• Out-of-Profile—If a meter is configured and the packet does not conform to the meter (exceeds the
committed rate or maximum burst rate of the meter), the packet is classified as Out-of-Profile.
Using meters, you set a Committed Rate in Kb/s (1024 bits per second in each Kb/s). All traffic within
this Committed Rate is In-Profile. Additionally, you set a Maximum Burst Size that specifies an allowed
data burst larger than the Committed Rate for a brief period. These parameters define the In-Profile traffic.
Meters keep the sorted packets within certain parameters. You can configure a meter on an ACL, and
perform actions on metered traffic, such as packet re-marking.
Re-marking
Re-marking allows for the treatment of packets to be reset based on new network specifications or desired
levels of service. You can configure the ACL to re-mark a packet as follows:
• Change the DSCP value of a packet, used to specify the service level traffic should receive.
• Change the 802.1p priority of a packet.
Viewing ACL statistics
ACL statistics display how many packets hit (matched) each ACL. Up to 64 statistic counters can be
displayed for each ACL Precedence Group. Use ACL statistics to check filter performance, and debug the
ACL filters.
You must enable statistics (
cfg/acl/acl x/stats ena
) for each ACL that you want to monitor.