ZyXEL Communications 4728F User Manual

 Chapter 26 IP Source Guard

XGS-4526/4528F/4728F User’s Guide

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 Advanced Application > IP Source Guard > 
DHCP Snooping > Configure.

Figure 120   DHCP Snooping Configure

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 79   DHCP Snooping (continued)