ZyXEL Communications 4728F User Manual

Chapter 26 IP Source Guard

XGS-4526/4528F/4728F User’s Guide

the bindings by snooping DHCP packets (dynamic bindings) and from information 
provided manually by administrators (static bindings). To open this screen, click 
Advanced Application > IP Source Guard.

Figure 117   IP Source Guard

The following table describes the labels in this screen.

Use this screen to manage static bindings for DHCP snooping and ARP inspection. 
Static bindings are uniquely identified by the MAC address and VLAN ID. Each MAC 
address and VLAN ID can only be in one static binding. If you try to create a static 
binding with the same MAC address and VLAN ID as an existing static binding, the 

Table 77   IP Source Guard

Index

This field displays a sequential number for each binding.

MAC Address

This field displays the source MAC address in the binding.

IP Address

This field displays the IP address assigned to the MAC address in the 
binding.

Lease

This field displays how many days, hours, minutes, and seconds the 
binding is valid; for example, 2d3h4m5s means the binding is still 
valid for 2 days, 3 hours, 4 minutes and 5 seconds. This field displays 
infinity if the binding is always valid (for example, a static binding).

Type

This field displays how the Switch learned the binding.

static: This binding was learned from information provided manually 
by an administrator.

dhcp-snooping: This binding was learned by snooping DHCP 
packets.

VID

This field displays the source VLAN ID in the binding.

Port

This field displays the port number in the binding. If this field is 
blank, the binding applies to all ports.