Dhcp Relay; Dhcp Relay Agent Information; Figure 92 Dhcp Status; Table 74 Dhcp Status - ZyXEL Communications MI-7248 User Manual

Chapter 35 DHCP

Figure 92 DHCP Status

The following table describes the labels in this screen.

Table 74 DHCP Status

LABEL
Index
VID
Server Status
IP Pool Size
Relay Mode

35.3 DHCP Relay

Configure DHCP relay on the switch if the DHCP clients and the DHCP server are not in the
same subnet. During the initial IP address leasing, the switch helps to relay network
information (such as the IP address and subnet mask) between a DHCP client and a DHCP
server. Once the DHCP client obtains an IP address and can connect to the network, network
information renewal is done between the DHCP client and the DHCP server without the help
of the switch.
The switch can be configured as a global DHCP relay. This means that the switch forwards all
DHCP requests from all domains to the same DHCP server. You can also configure the switch
to relay DHCP information based on the VLAN membership of the DHCP clients.

35.3.1 DHCP Relay Agent Information

The switch can add information about the source of client DHCP requests that it relays to a
DHCP server by adding Relay Agent Information. This helps provide authentication about
the source of the requests. The DHCP server can then provide an IP address based on this
information. Please refer to RFC 3046 for more details.
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.
198
DESCRIPTION
This is the index number.
This field displays the ID number of the VLAN group to which this DHCP settings
apply.
This field displays the starting DHCP client IP address.
This field displays the size of the DHCP client IP address pool.
This field displays:
• None - if the switch is not configured as a DHCP relay agent.
• Global - if the switch is configured as a DHCP relay agent only.
• VLAN - followed by a VLAN ID if it is configured as a relay agent for specific
VLAN(s).
MS-7206 User's Guide