ZyXEL Communications GS1510-24 Manual De Usuario

Chapter 18 IP Source Guard

GS1510 Series User’s Guide

Use this screen to define the maximum number of hosts allowed to simultaneously 
connect to each port. Each host that successfully acquires an IP address from a 

Server Ports

Select the ports that are connected to DHCP servers or other 
Switches and deselect the ports which are not.

Server ports are connected to DHCP servers or other switches, 
and the Switch discards DHCP packets from trusted ports only if 
the rate at which DHCP packets arrive is too high.

Untrusted ports are connected to subscribers, and the Switch 
discards DHCP packets from these ports in the following 
situations:

• The packet is a DHCP server packet (for example, OFFER, 

ACK, or NACK).

• The source MAC address and source IP address in the packet 

do not match any of the current bindings.

• The packet is a RELEASE or DECLINE packet, and the source 

MAC address and source port do not match any of the current 

bindings.

• The rate at which DHCP packets arrive is too high.

Select All

Click this to set all ports as server ports.

Deselect All

Click this to deselect all ports that are set as server ports.

Apply

Click this to save any changes to the Switch.

Refresh

Click this to reload the screen and reset any changes that were 
just made.

DHCP Snooping State This field displays the current status of the DHCP snooping 

feature, Enabled or Disabled.

Enabled on VLAN

This field displays the VLAN IDs that have DHCP snooping 
enabled on them. This will display None if no VLANs have been 
set.

Server Ports

This field displays the ports which have been set as server ports. 
This will display None if no ports have been set

Table 30   DHCP Snooping (continued)