ZyXEL Communications MGS3750-28F User Manual page 51

Chapter 6 Advanced Application Configurations
Table 33 Policy Screen
LABEL DESCRIPTION
Classifier(s) This field displays the active classifier(s) you configure in the Classifier screen.
Select the classifier(s) to which this policy rule applies. To select more than one
classifier, press [SHIFT] and select the choices at the same time.
Parameters
Set the fields below for this policy. You only have to set the field(s) that is related to the action(s) you
configure in the Action field.
Egress Port Type the number of an outgoing port.
Priority Specify a priority level.
DSCP Specify a DSCP (DiffServ Code Point) number between 0 and 63.
TOS Specify the type of service (TOS) priority level.
Bandwidth Specify the bandwidth in kilobit per second (Kbps). Enter a number between 1 and
1000000.
Action Action
Specify the action(s) the Switch takes on the associated classified traffic flow.
Note: You can specify only one action (pair) in a policy rule. To have the Switch take
Say you have several classifiers that identify the same traffic flow and you specify a
different policy rule for each. If their policy actions conflict (Discard the packet,
Send the packet to the egress port and Rate Limit), the Switch only applies the
policy rules with the Discard the packet and Send the packet to the egress port
actions depending on the classifier names. The longer the classifier name, the higher
the classifier priority. If two classifier names are the same length, the bigger the
character, the higher the classifier priority. The lowercase letters (such as a and b)
have higher priority than the capitals (such as A and B) in the classifier name. For
example, the classifier with the name of class 2, class a or class B takes priority over
the classifier with the name of class 1 or class A.
Let's say you set two classifiers (Class 1 and Class 2) and both identify all traffic from
MAC address 11:22:33:44:55:66 on port 3.
If Policy 1 applies to Class 1 and the action is to drop the packets, Policy 2 applies to
Class 2 and the action is to forward the packets to the egress port, the Switch will
forward the packets.
If Policy 1 applies to Class 1 and the action is to drop the packets, Policy 2 applies to
Class 2 and the action is to enable bandwidth limitation, the Switch will discard the
packets immediately.
If Policy 1 applies to Class 1 and the action is to forward the packets to the egress
port, Policy 2 applies to Class 2 and the action is to enable bandwidth limitation, the
Switch will forward the packets.
Forwarding Select No change to forward the packets.
Select Discard the packet to drop the packets.
Priority Select No change to keep the priority setting of the frames.
Select Set the packet's 802.1p priority and send the packet to priority queue
to replace the packet's 802.1p priority field with the value you set in the Priority field
and put the packets in the designated queue.
multiple actions on the same traffic flow, you need to define multiple classifiers
with the same criteria and apply different policy rules.
MGS3750-28F User's Guide
51