ZyXEL Communications MES-3528 -, User Manual

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Chapter 21 Policy Rule
MES-3528 User’s Guide
177
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 (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 foward 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 foward 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 802.1 priority to replace the packet’s 802.1
priority field with the value you set in the Priority field.
Outgoing Select Send the packet to the egress port to send the packet to the
egress port.
Select Set the packet's VLAN ID to replace the VLAN ID of the packets
with the value you configure in the VLAN ID field.
Rate Limit Select Enable 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 Save link on the top navigation
panel to save your changes to the non-volatile memory when you are
done configuring.
Table 48 Advanced Application > Policy Rule (continued)
LABEL DESCRIPTION