ZyXEL Communications XS-3900-48F User Manual page 218

Chapter 24 IP Source Guard
open this screen, click Advanced Application > IP Source Guard > ARP Inspection >
Configure > Port.
Figure 118 ARP Inspection Port Configure
The following table describes the labels in this screen.
Table 93 ARP Inspection Port Configure
LABEL
Port
Trusted State
Limit
Rate (pps)
Burst interval
(seconds)
Apply
Cancel
218
DESCRIPTION
This field displays the port number. If you configure the * port, the settings are
applied to all of the ports.
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.
Rate and Burst Interval settings have no effect on trusted ports.
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.
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.
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.
XS3900-48F User's Guide