ZyXEL Communications GS1920-48HPv2, Руководство пользователя

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Chapter 26 IP Source Guard
GS1920v2 Series User’s Guide
243
Fig ure 172
Advanced Application > IP Source Guard > IPv4 Source Guard Setup > DHCP Snooping >
Configure
The following table describes the labels in this screen.
Table 103 Advanced Application > IP Source Guard > IPv4 Source Guard Setup > DHCP Snooping >
Configure
LABEL DESC RIPTIO N
Active Select this to enable DHCP snooping on the Switch. You still have to enable DHCP
snooping on specific VLAN and specify trusted ports.
Note: If DHCP is enabled and there are no trusted ports, DHCP requests will
not succeed.
DHCP Vlan Select a VLAN ID if you want the Switch to forward DHCP packets to DHCP servers on a
specific VLAN.
Note: You have to enable DHCP snooping on the DHCP VLAN too.
You can enable
O ptio n82
in the
DHC P Sno o ping VLAN C o nfig ure
screen ( Section 26.6.2
on page 245 ) to help the DHCP servers distinguish between DHCP requests from
different VLAN.
Select
Disa b le
if you do not want the Switch to forward DHCP packets to a specific
VLAN.
Database If
Tim e o ut inte rva l
is greater than
Write de la y inte rva l
, it is possible that the next update
is scheduled to occur before the current update has finished successfully or timed out.
In this case, the Switch waits to start the next update until it completes the current one.
Agent URL Enter the location of the DHCP snooping database. The location should be expressed
like this:
tftp:/ / {do m a in na m e o r IP a ddre ss}/ dire c to ry, if a pplic a b le / file na m e
; for
example,
tftp:/ / 192.168.10.1/ da ta b a se .txt
.
Timeout interval Enter how long (10-65535 seconds) the Switch tries to complete a specific update in
the DHCP snooping database before it gives up.
Write delay interval Enter how long (10-65535 seconds) the Switch waits to update the DHCP snooping
database the first time the current bindings change after an update. Once the next
update is scheduled, additional changes in current bindings are automatically
included in the next update.