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Chapter 25 DHCP Relay
IES-612-51A User’s Guide
189
The following table describes the labels in this screen.
Table 55 DHCP Relay
LABEL DESCRIPTION
Enable DHCP
Relay:
Enable DHCP relay to have the IES-612-51A relay DHCP requests to a DHCP
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
Sub-option1
Enable DHCP relay info to have the IES-612-51A add the originating port
numbers to DHCP requests regardless of whether the DHCP relay is on or off.
Sub-option1 (Circuit
ID)
Use this field to specify up to 23 ASCII characters of additional information for
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
Sub-option2
Enable DHCP relay info to have the IES-612-51A add the sub-option 2 (Remote
ID) to DHCP requests regardless of whether the DHCP relay is on or off.
Sub-option2
(Remote ID)
Use this field to specify up to 23 ASCII characters of additional information for
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
IP
Enter the IP address of a second DHCP server to which the switch should relay
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
IP
This field displays the IP address of a second DHCP server to which the switch
should relay DHCP requests. This field is 0.0.0.0 if the primary server is the only
DHCP relay.