Chapter 64 ARP Inspection
GS1920v2 Series User’s Guide
408
64.6 ARP Inspection VLAN Setup
Use this screen to enable ARP inspection on each VLAN and to specify when the Switch generates log
messages for receiving ARP packets from each VLAN. To open this screen, click SECURITY > IPv4 Source
Guard > ARP Inspection > ARP Insp. VLAN Setup.
Figure 296 SECURITY > IPv4 Source Guard > ARP Inspection > ARP Insp. VLAN Setup
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 Rate and Burst Interval 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.
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 230 SECURITY > IPv4 Source Guard > ARP Inspection > ARP Insp. Port Setup (continued)
LABEL DESCRIPTION
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