ZyXEL Communications XGS-4528F, User Manual, Page: 278 / 491

Chapter 26 IP Source Guard
XGS-4526/4528F/4728F User’s Guide
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The following table describes the labels in this screen.
Table 86 ARP Inspection Configure
LABEL DESCRIPTION
Active Select this to enable ARP inspection on the Switch. You still have to
enable ARP inspection on specific VLAN and specify trusted ports.
Filter Aging Time
Filter aging
time
This setting has no effect on existing MAC address filters.
Enter how long (1-2147483647 seconds) the MAC address filter
remains in the Switch after the Switch identifies an unauthorized ARP
packet. The Switch automatically deletes the MAC address filter
afterwards. Type 0 if you want the MAC address filter to be
permanent.
Log Profile
Log buffer size Enter the maximum number (1-1024) of log messages that were
generated by ARP packets and have not been sent to the syslog server
yet. Make sure this number is appropriate for the specified Syslog
rate and Log interval.
If the number of log messages in the Switch exceeds this number, the
Switch stops recording log messages and simply starts counting the
number of entries that were dropped due to unavailable buffer. Click
Clearing log status table in the ARP Inspection Log Status
screen to clear the log and reset this counter. See
Section 26.6.2 on
page 276 .
Syslog rate Type the maximum number of syslog messages the Switch can send
to the syslog server in one batch. This number is expressed as a rate
because the batch frequency is determined by the Log Interval. You
must configure the syslog server (
Chapter 48 on page 425 ) to use
this. Enter 0 if you do not want the Switch to send log messages
generated by ARP packets to the syslog server.
The relationship between Syslog rate and Log interval is illustrated
in the following examples:
• 4 invalid ARP packets per second, Syslog rate is 5, Log interval
is 1: the Switch sends 4 syslog messages every second.
• 6 invalid ARP packets per second, Syslog rate is 5, Log interval
is 2: the Switch sends 5 syslog messages every 2 seconds.
Log interval Type how often (1-86400 seconds) the Switch sends a batch of syslog
messages to the syslog server. Enter 0 if you want the Switch to send
syslog messages immediately. See Syslog rate for an example of the
relationship between Syslog rate and Log interval.
Apply Click Apply to 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.
Cancel Click this to reset the values in this screen to their last-saved values.