Allied Telesis AT-FS970M Series - Manual (Page 253)

AT-FS970M Series Version 2.3.1.0 Web Interface User’s Guide
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Filtering Criteria
QoS policies identify packets using filtering criteria. The AT-FS970M web
interface offers seven criteria:
 Source and destination IP addresses
 Source and destination MAC addresses
 Source and destination TCP ports
 Source and destination UDP ports
 VLAN IDs
 CoS value
 DSCP value
Actions
The action defines the response to packets that match the filtering criteria
of a QoS policy. There are three actions that you can choose from using
the AT-FS970M web interface:
 Priority Queue— This action causes a port to place all ingress
packets that match the filtering criteria to the specified priority queue.
 Mark DSCP— This action causes a port to change the DSCP value of
all ingress packets that match the filtering criteria with the specified
DSCP value.
 Mark CoS— This action causes a port to change the CoS value of all
ingress packets that match the filtering criteria with the specified CoS
value.
How Ingress
Packets are
Selected with
Filtering Criteria
A QoS policy can have more than one filtering criterion. A QoS policy that
has one filtering criterion that specifies a particular source IP address, for
example, selects only packets with the specified source address and
applies the specified action. A QoS policy that has two filtering criteria that
specify a particular VLAN ID and DSCP value, for example, selects only
packets that match the specified VLAN ID and DSCP value.
Guidelines
Here are the QoS guidelines:
 A QoS policy can have a “Priority Queue,” “Mark DSCP,” or “Mark
CoS” action. The priority queue action allows a port to place ingress
packets that match the filtering criteria to the specified priority queue.
The Mark DSCP action causes a port to change the DSCP value of all
ingress packets that match the filtering criteria with the specified DSCP
Specifying a MAC address 4000 - 4699
Specifying no address 3000 - 3699 and 4000 - 4699
Table 10. Classifier Number Ranges for QoS
Filtering Criterion Classifier Number Range