ZyXEL Communications GS1920-48HPv2, Руководство пользователя

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Chapter 22 Policy Rule
GS1920v2 Series User’s Guide
196
Rate Limit You can configure the desired bandwidth available to a traffic flow. Traffic that exceeds the
maximum bandwidth allocated (in cases where the network is congested) is dropped.
Bandwidth Specify the bandwidth in kilobit per second (Kbps). Enter a number between 64 and 1000000.
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 multiple actions
on the same traffic flow, you need to define multiple classifiers with the same criteria and apply
different policy rules.
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 (
Disc a rd the pa c ke t
,
Se nd the pa c ke t to the e g re ss po rt
and
Ra te Lim it
), the Switch only
applies the policy rules with the
Disc a rd the pa c ke t
and
Se nd the pa c ke t to the e g re ss po rt
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 c ha ng e
to forward the packets.
Select
Disc a rd the pa c ke t
to drop the packets.
Priority Select
No c ha ng e
to keep the priority setting of the frames.
Select
Se t the pa c ke t’s 802.1 prio rity
to replace the packet’s 802.1 priority field with the value you
set in the Priority field.
Outgoing Select
Se nd the pa c ke t to the m irro r po rt
to send the packet to the mirror port.
Select
Se nd the pa c ke t to the e g re ss po rt
to send the packet to the egress port.
Select
Se t the pa c ke t's VLAN ID
to replace the VLAN ID of the packets with the value you
configure in the
VLAN ID
field.
Rate Limit Select
Ena b le
to activate bandwidth limitation on the traffic flow(s).
Add Click
Add
to inset the entry to the summary table below and save your changes to the Switch’s
run-time memory. The Switch loses these changes if it is turned off or loses power, so use the
Sa ve
link on the top navigation panel to save your changes to the non-volatile memory when you are
done configuring.
Cancel Click
C a nc e l
to reset the fields back to your previous configuration.
Clear Click
C le a r
to set the above fields back to the factory defaults.
Index This field displays the policy index number. Click an index number to edit the policy.
Active This field displays
Ye s
when policy is activated and
No
when is it deactivated.
Name This field displays the name you have assigned to this policy.
Classifier(s) This field displays the name(s) of the classifier to which this policy applies.
Select an entry’s check box to select a specific entry. Otherwise, select the check box in the
table heading row to select all entries.
Table 78 Advanced Application > Policy Rule (continued)
LABEL DESC RIPTIO N