Chapter 25 IP Source Guard
GS1920 Series User’s Guide
217
Figure 157
Advanced Application > IP Source Guard > ARP Inspection > Configure > Port
The following table describes the labels in this screen.
Table 100
Advanced Application > IP Source Guard > ARP Inspection > Configure > Port
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.
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