ZyXEL Communications ES3500-24 User Manual page 232

Chapter 26 IP Source Guard
open this screen, click Advanced Application > IP Source Guard > ARP Inspection >
Configure > Port.
Figure 127 ARP Inspection Port Configure
The following table describes the labels in this screen.
Table 91 ARP Inspection Port Configure
LABEL
Port
Trusted State
Limit
Rate (pps)
Burst interval
(seconds)
Apply
Cancel
232
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.
ES3500 Series User's Guide