ZyXEL Communications ES3500 Series Port, state, Apply, Cancel, Show VLAN, Start VID, Rate (pps), of the ports, Server Trusted, current bindings, Chapter 37 on page

Chapter 26 IP Source Guard

The following table describes the labels in this screen.

Table 85 DHCP Snooping Port Configure

LABEL	DESCRIPTION
Port	This field displays the port number. If you configure the * port, the settings are applied to all
	of the ports.
Server Trusted	Select whether this port is a trusted port (Trusted) or an untrusted port (Untrusted).
state	Trusted 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
	untrusted 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.
Rate (pps)	Specify the maximum number for DHCP packets (1-2048) that the Switch receives from each
	port each second. The Switch discards any additional DHCP packets. Enter 0 to disable this
	limit, which is recommended for trusted ports.
Apply	Click Apply to save your changes to the Switch’s run-time memory. The Switch loses these
	changes if it is turned off or loses power, so use the Save link on the top navigation panel to
	save your changes to the non-volatile memory when you are done configuring.
Cancel	Click this to reset the values in this screen to their last-saved values.

26.5.2 DHCP Snooping VLAN Configure

Use this screen to enable DHCP snooping on each VLAN and to specify whether or not the Switch adds DHCP relay agent option 82 information (Chapter 37 on page 278) to DHCP requests that the Switch relays to a DHCP server for each VLAN. To open this screen, click Advanced Application > IP Source Guard > DHCP Snooping > Configure > VLAN.

Figure 122 DHCP Snooping VLAN Configure

The following table describes the labels in this screen.

Table 86 DHCP Snooping VLAN Configure

LABEL	DESCRIPTION
Show VLAN	Use this section to specify the VLANs you want to manage in the section below.
Start VID	Enter the lowest VLAN ID you want to manage in the section below.

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	ES3500 Series User’s Guide