ZyXEL Communications GS1920-48HPv2, Руководство пользователя

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Chapter 26 IP Source Guard
GS1920v2 Series User’s Guide
253
The following table describes the labels in this screen.
26.10.2 ARP Inspe c tio n VLAN C o nfig ure
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
Adva nc e d Applic a tio n
> IP So urc e G ua rd > IPv4 So urc e G ua rd Se tup > ARP Inspe c tio n > C o nfig ure > VLAN
.
Table 111 Advanced Application > IP Source Guard > IPv4 Source Guard Setup > ARP Inspection >
Configure > Port
LABEL DESC RIPTIO N
Port This field displays the port number. If you configure the
*
port, the settings are applied
to all of the ports.
* Settings in this row apply to all ports.
Use this row only if you want to make some settings the same for all ports. Use this row
first to set the common settings and then make adjustments on a port-by-port basis.
Note: Changes in this row are copied to all the ports as soon as you make
them.
Trusted State Select whether this port is a trusted port (
Truste d
) or an untrusted port (
Untruste d
).
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.
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
Sa ve
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.