Allied-telesis AT-S62 Manual de usuario Pagina 235

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AT-S62 Management Software Menus Interface User’s Guide
Section II: Advanced Operations 235
is dictated by the QoS policy, as explained in Chapter 15 on page 267.
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
802.1p Priority Level (Layer 2)
A tagged Ethernet frame, as explained in “Tagged VLAN Overview” on
page 555, contains within it a field that specifies its VLAN membership.
Such frames also contain a user priority level used by the switch to
determine the Quality of Service to apply to the frame and which egress
queue on the egress port a packet should be stored in. The three bit binary
number represents eight priority levels, 0 to 7, with 0 the lowest priority
and 7 the highest. Figure 65 illustrates the location of the user priority field
within an Ethernet frame.
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