ZyXEL Communications ES-2024 Series - Page 196

Chapter 23 IP Source Guard
ES-2024 Series User’s Guide
196
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 23.4.1 on page 193.
Syslog rate Enter 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 31 on
page 257) 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 10 syslog messages every 2
seconds.
Log interval Enter 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.
Table 62 ARP Inspection Configure (continued)
LABEL DESCRIPTION