Arp Inspection Port Configure - ZyXEL Communications MES3500-24F User Manual

Chapter 26 IP Source Guard
The following table describes the labels in this screen.
Table 84 ARP Inspection Configure
LABEL
Active
Filter Aging Time
Filter aging time
Log Profile
Log buffer size
Syslog rate
Log interval
Apply
Cancel

26.7.1 ARP Inspection Port Configure

Use this screen to specify whether ports are trusted or untrusted ports for ARP inspection. You can
also specify the maximum rate at which the Switch receives ARP packets on each untrusted port. To
230
DESCRIPTION
Select this to enable ARP inspection on the Switch. You still have to enable ARP
inspection on specific VLAN and specify trusted ports.
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.
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
26.6.2 on page 228.
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
page 313) 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.
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.
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.
Click this to reset the values in this screen to their last-saved values.
Section
(Chapter 40 on
MES3500-24/24F User's Guide