User Manual

Table Of Contents
Users Manual of IGS-5225 series
83
done at less than one-half of the advertising duration. In the implementation, the
switch sends SSDP messages periodically at the interval one-half of the
advertising duration minus 30 seconds. Valid values are in the range 100 to
86400.
IP Addressing Mode
IP addressing mode provides two ways to determine IP address assignment:
Dynamic: Default selection for UPnP. UPnP module helps users choosing the IP
address of the switch device. It finds the first available system IP address.
Static: User specifies the IP interface VLAN for choosing the IP address of the
switch device.
Static VLAN Interface
ID
The index of the specific IP VLAN interface. It will only be applied when IP
Addressing Mode is static. Valid configurable values ranges from 1 to 4095.
Default value is 1.
Buttons
: Click to apply changes
: Click to undo any changes made locally and revert to previously saved values.
4.2.1.9 DHCP Relay
Configure DHCP Relay on this page. DHCP Relay is used to forward and transfer DHCP messages between the clients and the
server when they are not on the same subnet domain.
The DHCP option 82 enables a DHCP relay agent to insert specific information into a DHCP request packets when forwarding
client DHCP packets to a DHCP server and remove the specific information from a DHCP reply packets when forwarding server
DHCP packets to a DHCP client. The DHCP server can use this information to implement IP address or other assignment
policies. Specifically the option works by setting two sub-options:
Circuit ID (option 1)
Remote ID (option 2)
The Circuit ID sub-option is supposed to include information specific to which circuit the request came in on.
The Remote ID sub-option was designed to carry information relating to the remote host end of the circuit.
The definition of Circuit ID in the switch is 4 bytes in length and the format is "vlan_id" "module_id" "port_no". The parameter of
"vlan_id" is the first two bytes representing the VLAN ID. The parameter of "module_id" is the third byte for the module ID. The
parameter of "port_no" is the fourth byte and it means the port number.
The Remote ID is 6 bytes in length, and the value equals the DHCP relay agent’s MAC address. The DHCP Relay Configuration
screen in Figure 4-2-12 appears.