Chapter 25 DHCP Relay

The following table describes the labels in this screen.

Table 55 DHCP Relay

LABEL

DESCRIPTION

Enable DHCP

Enable DHCP relay to have the IES-612-51A relay DHCP requests to a DHCP

Relay:

server and the server’s responses back to the clients.

 

 

Relay Mode

Specify how the IES-612-51A relays DHCP requests.

 

Auto - The IES-612-51A routes DHCP requests to the active server for each

 

VLAN.

 

Both - The IES-612-51A routes DHCP requests to the primary and secondary

 

server for each VLAN, regardless of which one is active.

 

 

Enable Option82

Enable DHCP relay info to have the IES-612-51A add the originating port

Sub-option1

numbers to DHCP requests regardless of whether the DHCP relay is on or off.

 

 

Sub-option1 (Circuit

Use this field to specify up to 23 ASCII characters of additional information for

ID)

the IES-612-51A to add to the DHCP requests that it relays to a DHCP server.

 

Examples of information you could add would be the chassis number of the IES-

 

612-51A or the ISP’s name.

 

 

Enable Option82

Enable DHCP relay info to have the IES-612-51A add the sub-option 2 (Remote

Sub-option2

ID) to DHCP requests regardless of whether the DHCP relay is on or off.

 

 

Sub-option2

Use this field to specify up to 23 ASCII characters of additional information for

(Remote ID)

the IES-612-51A to add to the DHCP requests that it relays to a DHCP server.

 

 

Apply

Click Apply to save your changes to the IES-612-51A’s volatile memory. The

 

IES-612-51A loses these changes if it is turned off or loses power, so use the

 

Config Save link on the navigation panel to save your changes to the non-

 

volatile memory when you are done configuring.

 

 

Cancel

Click Cancel to begin configuring this screen afresh.

 

 

VLAN ID

Enter the ID of the VLAN served by the specified DHCP relay(s). Enter 0 to set

 

up the IP address(es) of the default DHCP relay(s).

 

 

Primary Server IP

Enter the IP address of one DHCP server to which the switch should relay

 

DHCP requests for the selected VLAN.

 

 

Secondary Server

Enter the IP address of a second DHCP server to which the switch should relay

IP

DHCP requests for the selected VLAN. Enter 0.0.0.0 if there is only one DHCP

 

relay for the selected VLAN.

 

 

Active Server

This field has no effect if the Relay Mode is Both. If the Relay Mode is Auto,

 

select which DHCP server (the primary one or the secondary one) to which the

 

IES-612-51A should relay DHCP requests for the selected VLAN.

 

 

Apply

Click Apply to save your changes to the IES-612-51A’s volatile memory. The

 

IES-612-51A loses these changes if it is turned off or loses power, so use the

 

Config Save link on the navigation panel to save your changes to the non-

 

volatile memory when you are done configuring.

 

 

Cancel

Click Cancel to begin configuring this screen afresh.

 

 

Server List

This section lists the DHCP servers that are already set up for each VLAN. An

 

asterisk in parentheses (*) indicates which DHCP server is active for each

 

VLAN.

 

 

Index

This is a sequential value, and it is not associated with any entry. The entries

 

are sorted by VLAN ID.

 

 

VLAN ID

This field displays the ID of the VLAN served by the specified DHCP relay(s).

 

 

Primary Server IP

This field displays the IP address of one DHCP server to which the switch

 

should relay DHCP requests.

 

 

Secondary Server

This field displays the IP address of a second DHCP server to which the switch

IP

should relay DHCP requests. This field is 0.0.0.0 if the primary server is the only

 

DHCP relay.

 

 

 

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IES-612-51A User’s Guide