Quality of Service
QoS Advanced Mode
Cisco Small Business 200, 300 and 500 Series Managed Switch Administration Guide (Internal Version) 508
25
To enter QoS settin gs per inter face:
STEP 1 Click Quality of Service > QoS Basic Mode > Interface Settings.
STEP 2 Select Port or LAG to display the list of ports or LAGs.
QoS State displays whether QoS is enabled on the interface.
STEP 3 Select an interface, and click Edit.
STEP 4 Select the Port or LAG interface.
STEP 5 Click to enable or disable QoS State for this interface.
STEP 6 Click Apply. The Running Configuration file is updated.
QoS Advanced Mode
Frames that match an ACL and were permitted entrance are implicitly labeled with
the name of the ACL that permitted their entrance. Advanced mode QoS actions
can then be applied to these flows.
In QoS advanced mode, the device uses policies to support per flow QoS. A
policy and its components have the following characteristics and relationships:
•A policy contains one or more class maps.
•A class map defines a flow with one or more associating ACLs. Packets that
match only ACL rules (ACE) in a class map with Permit (forward) action are
considered belonging to the same flow, and are subjected to the same
quality of services. Thus, a policy contains one or more flows, each with a
user defined QoS.
•The QoS of a class map (flow) is enforced by the associating policer. There
are two type of policers, single policer and aggregate policer. Each policer
is configured with a QoS specification. A single policer applies the QoS to a
single class map, and thus to a single flow, based on the policer QoS
specification. An aggregate policer applies the QoS to one or more class
maps, and thus one or more flows. An aggregate policer can support class
maps from different policies.