ZyXEL Communications GS1920-48HPv2, Руководство пользователя

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Chapter 26 IP Source Guard
GS1920v2 Series User’s Guide
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26.6 DHC P Sno o ping C o nfig ure
Use this screen to enable DHCP snooping on the Switch (not on specific VLAN), specify the VLAN where
the default DHCP server is located, and configure the DHCP snooping database. The DHCP snooping
database stores the current bindings on a secure, external TFTP server so that they are still available after
a restart. 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
> DHC P Sno o ping > C o nfig ure
.
Binding collisions This field displays the number of bindings the Switch ignored because the Switch
already had a binding with the same MAC address and VLAN ID.
Invalid interfaces This field displays the number of bindings the Switch ignored because the port number
was a trusted interface or does not exist anymore.
Parse failures This field displays the number of bindings the Switch ignored because the Switch was
unable to understand the binding in the DHCP binding database.
Expired leases This field displays the number of bindings the Switch ignored because the lease time
had already expired.
Unsupported vlans This field displays the number of bindings the Switch ignored because the VLAN ID does
not exist anymore.
Last ignored time This field displays the last time the Switch ignored any bindings for any reason from the
DHCP binding database.
Total ignored bindings
counters This section displays the reasons the Switch has ignored bindings any time it read
bindings from the DHCP binding database. You can clear these counters by restarting
the Switch.
Binding collisions This field displays the number of bindings the Switch has ignored because the Switch
already had a binding with the same MAC address and VLAN ID.
Invalid interfaces This field displays the number of bindings the Switch has ignored because the port
number was a trusted interface or does not exist anymore.
Parse failures This field displays the number of bindings the Switch has ignored because the Switch
was unable to understand the binding in the DHCP binding database.
Expired leases This field displays the number of bindings the Switch has ignored because the lease
time had already expired.
Unsupported vlans This field displays the number of bindings the Switch has ignored because the VLAN ID
does not exist anymore.
Table 102 Advanced Application > IP Source Guard > IPv4 Source Guard Setup > DHCP Snooping
LABEL DESC RIPTIO N