Allied Telesis AT-S101 - Manual (Page 187)

AT-S101 Management Software Features Guide
187
Classifier Criteria
The components of a classifier are defined in the following subsections.
Source MAC Address
Destination MAC Address
You can identify a traffic flow by specifying a 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. Different MAC addresses must be considered
separate traffic flows, with their own classifiers.
Ethernet 802.2 and Ethernet II Frame Types
You can create a classifier that filters packets based on Ethernet frame
type and whether a packet is tagged or untagged within a 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:
ˆ Ethernet II tagged packets
ˆ Ethernet II untagged packets
ˆ Ethernet 802.2 tagged packets
ˆ Ethernet 802.2 untagged packets
802.1p Priority Level
A tagged Ethernet frame, as explained in “Tagged VLAN Overview” on
page 48, 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 56 on page 188 illustrates the location of the
user priority field within an Ethernet frame.