ZyXEL Communications GS2200 Series, User Manual

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Chapter 25 IP Source Guard
GS2200 Series User’s Guide
203
open this screen, click Advanced Application > IP Source Guard > ARP Inspection >
Configure > Port.
Figure 130
ARP Inspection Port Configure
The following table describes the labels in this screen.
Table 77
ARP Inspection Port Configure
LABEL DESCRIPTION
Port This field displays the port number. If you configure the * port, the settings are applied
to all of the ports.
Trusted State Select whether this port is a trusted port (Trusted) or an untrusted port (Untrusted).
The Switch does not discard ARP packets on trusted ports for any reason.
The Switch discards ARP packets on untrusted ports in the following situations:
• The sender’s information in the ARP packet does not match any of the current
bindings.
• The rate at which ARP packets arrive is too high. You can specify the maximum rate
at which ARP packets can arrive on untrusted ports.
Limit These settings have no effect on trusted ports.
Rate (pps) Specify the maximum rate (1-2048 packets per second) at which the Switch receives
ARP packets from each port. The Switch discards any additional ARP packets. Enter 0 to
disable this limit.
Burst interval
(seconds)
The burst interval is the length of time over which the rate of ARP packets is monitored
for each port. For example, if the rate is 15 pps and the burst interval is 1 second, then
the Switch accepts a maximum of 15 ARP packets in every one-second interval. If the
burst interval is 5 seconds, then the Switch accepts a maximum of 75 ARP packets in
every five-second interval.
Enter the length (1-15 seconds) of the burst interval.