Allied Telesis AT-S62 - Manual (Page 221)

AT-S62 Menus Interface User’s Guide
Section II: Advanced Operations 221
As with an ACL, you specify the traffic flow of interest by creating one or
more classifiers and applying them to a QoS policy. The action to be
taken by a port when it receives a packet that corresponds to the
prescribed flow is dictated by the QoS policy, as explained in Chapter 16
on page 253.
In summary, a classifier is a list of variables that define a traffic flow. You
apply a classifier to an ACL or a QoS policy to define the traffic flow you
want the ACL or QoS policy to affect or control.
Classifier Criteria
The criteria of a classifier are defined in the following subsections.
Destination MAC Address (Layer 2)
Source MAC Address (Layer 2)
You can identify a traffic flow by specifying the source and/or
destination MAC address. For instance, you might create a classifier for a
traffic flow destined to a particular destination node, or from a specific
source node to a specific destination node, all identified by their MAC
addresses.
The management software does not support a classifier based on a
range of MAC addresses. Each source and destination MAC address must
be considered as a separate traffic flow, requiring its own classifier.
Ethernet 802.2 and Ethernet II Frame Types (Layer 2)
You can create a classifier that filters packets based on Ethernet frame
type and on whether a packet is tagged or untagged within a particular
frame type. (A tagged Ethernet frame contains within it a field that
specifies the ID number of the VLAN to which the frame belongs.
Untagged packets lack this field.) Options are:
❑ Ethernet II tagged packets
❑ Ethernet II untagged packets
❑ Ethernet 802.2 tagged packets
❑ Ethernet 802.2 untagged packets