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 state

Select whether this port is a trusted port (Trusted) or an

 

untrusted port (Untrusted).

 

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 349) to DHCP requests that the Switch relays to a DHCP server for each VLAN. To

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ZyXEL Communications metrogigabit switch manual Dhcp Snooping Vlan Configure, 283
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metrogigabit switch specifications

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