Allied Telesis AT-S63 - Manual (Page 354)

Chapter 20: Quality of Service (QoS) Commands
354 Section II: Advanced Operations
ˆ IP DSCP values:
class-map 256-1023
match ip-dscp 0-63
ˆ TCP flags:
class-map 256-1023
match tcp-flags urg|ack|rst|psh|syn|fin
ˆ VAN ID values:
class-map 256-1023
match vlan 1-4094
Mode
Class Map mode
Description
Quality of Service policies, of which flow groups are only one part, are
created with the AlliedWare Plus commands in a different manner than
with the other management interfaces. These differences are described
here. To better understand the differences, you should review the
background information on Quality of Service policies in the AT-S63
Management Software Features Guide before you read this description.
One of the main differences concerns how you create the classifiers that
define the traffic flows the Quality of Service are to control. In the other
management interfaces — the menus, the web browser windows and the
standard command line interface — the classifiers are created separately
and are then attached to the flow groups.
With the AlliedWare Plus commands a flow group and its classifier are
considered a unit. You create them at the same time with the CLASS-MAP
and MATCH commands. You use the CLASS-MAP command to specify
the joint ID number for a flow group and a classifier, and the MATCH
command to define a classifier’s traffic flow and, by extension, the traffic
flow of the Quality of Service policy.
Probably the most importance difference between the management
interfaces concerns the amount of control you have over the parameters in
the classifiers and the flow groups themselves. If you examine the
syntaxes of “CREATE CLASSIFIER” on page 310 and “CREATE QOS
FLOWGROUP” on page 351, you’ll see that classifiers and flow groups
have quite a few parameters you can set, all of which are available to you
when you create these items with any of the other management
interfaces.