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ISCOM2600G-HI (A) Series Configuration Guide
Options
18
37
51
53
55
61
66
67
82
150
184
255
Options 18, 37, 61, and 82 in DHCP Option are relay information options in DHCP packets.
When a DHCP client sends request packets to the DHCP server by passing a DHCP Relay or
DHCP Snooping device, the DHCP Relay or DHCP Snooping device will add Option fields to
the request packets.
Options 18, 37, 61, and 82 implement recording of information about DHCP clients on the
DHCP server. By cooperating with other software, it can implement functions, such as limit
on IP address distribution and accounting. For example, by cooperating with IP Source Guard,
Options 18, 61, 82 can defend deceiving through IP address+MAC address.
Option 82 can include up to 255 sub-options. If the Option 82 field is defined, at least one
sub-option must be defined. The ISCOM2600G-HI series switch supports the following two
sub-options:
IPv6 DHCP client flag option, used to specify interface information about
DHCP clients
IPv6 DHCP client flag option, used to specify device information about
DHCP clients
IP address lease option
DHCP packet type option, used to mark the type of DHCP packets
Request parameter list option, used to indicate network configuration
parameters to be obtained from the server, containing values of these
parameters
DHCP client flag option, used to assign device information for DHCP clients
TFTP server name option, used to specify the domain name of the TFTP
server assigned for DHCP clients
Startup file name option, used to specify the name of the startup file assigned
for DHCP clients
DHCP client flag option, user-defined, used to mark the position of DHCP
clients, including Circuit ID and remote ID
TFTP server address option, used to specify the IP address of the TFTP server
assigned for DHCP clients
DHCP reserved option. At present Option 184 is used to carry information
required by voice calling. Through Option 184, the DHCP server can
distribute IP addresses for DHCP clients with voice function and meanwhile
provide information about voice calling.
Complete option
Sub-Option 1 (Circuit ID): it contains the interface ID, interface VLAN, and additional
information about request packets of the DHCP client.
Sub-Option 2 (Remote ID): it contains interface MAC address (DHCP Relay), or bridge
MAC address (DHCP Snooping device) of the ISCOM2600G-HI series switch, or user-
defined string in request packets of the DHCP client.
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Description
6 DHCP
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