Blade ICE RACKSWITCH G8124-E - Manual (Page 136)

BLADEOS 6.5.2 Application Guide
136 Chapter 9: Quality of Service BMD00220, October 2010
ACL Metering and Re-Marking
You can define a profile for the aggregate traffic flowing through the G8124 by configuring a QoS
meter (if desired) and assigning ACLs to ports. When you add ACLs to a port, make sure they are
ordered correctly in terms of precedence.
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 Kbps (multiples of 64 Mbps). 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.