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Chapter 25 IP Source Guard

GS2200-8/24 User’s Guide

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25.5 DHCP Snooping Configure

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

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 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 69 DHCP Snooping (continued)

LABEL DESCRIPTION