Chapter 33 DHCP

The DHCP Relay Agent Information feature adds an Agent Information field to the Option 82 field. The Option 82 field is in the DHCP headers of client DHCP request frames that the Switch relays to a DHCP server.

Relay Agent Information can include the System Name of the Switch if you select this option. You can change the System Name in Basic Settings > General Setup.

The following describes the DHCP relay information that the Switch sends to the DHCP server:

Table 102 Relay Agent Information

FIELD LABELS

DESCRIPTION

Slot ID

(1 byte) This value is always 0 for stand-alone switches.

 

 

Port ID

(1 byte) This is the port that the DHCP client is connected to.

 

 

VLAN ID

(2 bytes) This is the VLAN that the port belongs to.

 

 

Information

(up to 32 bytes) This optional, read-only field is set according

 

to system name set in Basic Settings > General Setup.

 

 

33.4.2 Configuring DHCP Global Relay

Configure global DHCP relay in the DHCP Relay screen. Click IP Application > DHCP in the navigation panel and click the Global link to display the screen as shown.

Figure 146 IP Application > DHCP > Global

The following table describes the labels in this screen.

Table 103 IP Application > DHCP > Global

LABEL

DESCRIPTION

Active

Select this check box to enable DHCP relay.

 

 

Remote

Enter the IP address of a DHCP server in dotted decimal notation.

DHCP Server

 

1 .. 3

 

 

 

Relay Agent

Select the Option 82 check box to have the Switch add information (slot number, port

Information

number and VLAN ID) to client DHCP requests that it relays to a DHCP server.

 

 

Information

This read-only field displays the system name you configure in the General Setup

 

screen.

 

Select the check box for the Switch to add the system name to the client DHCP

 

requests that it relays to a DHCP server.

 

 

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GS-4012F/4024 User’s Guide