ZyXEL Communications GS2220 Series - DHCP Snooping Configure

GS2220 Series User’s Guide
266
27.3 DHC P Sno o ping Co 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 Sourc e Gua rd > IPv4 So urc e G ua rd Se tup > DHC P
Sno o ping > C onfig ure .
Fig ure 199 Advanced Application > IP Source Guard > IPv4 Source Guard Setup > DHCP Snooping >
Configure
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 or
using CLI commands. See the Ethernet Switch CLI Reference Guide.
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 121 Advanced Application > IP Source Guard > IPv4 Source Guard Setup > DHCP Snooping
LABEL DESCRIPTIO N