ZyXEL Communications SAM1316-22, User Manual

Page: 186 / 464

Chapter 26 DHCP Relay
SAM1316-22 User’s Guide
186
Enable Option 82
sub option 1
(Circuit ID) Select this to have the SAM1316-22 add the originating port numbers
to DHCP requests in the selected VLAN regardless of whether the
DHCP relay is on or off. In the field next to the check box, you can
also specify up to 23 English keyboard characters of additional
information for the SAM1316-22 to add to the DHCP requests that the
SAM1316-22 relays to a DHCP server. Examples of information you
could add would be the system name of the SAM1316-22 or the ISP’s
name.
Enable Option 82
sub option 2
(Remote ID) Select this to have the SAM1316-22 add the sub-option 2 (Remote
ID) to DHCP requests in the selected VLAN regardless of whether the
DHCP relay is on or off. In the field next to the check box, you can
also specify up to 23 English keyboard characters of additional
information for the SAM1316-22 to add to the DHCP requests that it
relays to a DHCP server.
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.
Relay Mode Specify how the SAM1316-22 relays DHCP requests.
Auto - The SAM1316-22 routes DHCP requests to the active server
for each VLAN.
Both - The SAM1316-22 routes DHCP requests to the primary and
secondary server for each VLAN, regardless of which one is active.
Option Mode Select which method (Private or TR-101) to use to encode PPPoE
line information in PPPoE discover packets.
Active Server This field has no effect if the Relay Mode is Both. If the Relay Mode
is Auto, select which DHCP server (Primary or Secondary) to which
the SAM1316-22 should relay DHCP requests for the selected VLAN.
Apply Click Apply to save your changes to the SAM1316-22’s volatile
memory. The SAM1316-22 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.
VID This field displays the ID of the VLAN served by the specified DHCP
relay(s).
Active This field displays whether or not the SAM1316-22 relays DHCP
requests in the selected VLAN to a DHCP server and the server’s
responses back to the clients.
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.
Table 60 DHCP Relay (continued)
LABEL DESCRIPTION