ECS4660-28F_Management Guide-R03

C HAPTER 17 | IP Services
Dynamic Host Configuration Protocol
– 720 –
SPECIFYING A DHCP
CLIENT IDENTIFIER
Use the IP Service > DHCP > Client page to specify the DHCP client
identifier for a VLAN interface.
CLI REFERENCES
◆ "ip dhcp client class-id" on page 1625
COMMAND USAGE
◆ The class identifier is used identify the vendor class and configuration of
the switch to the DHCP server, which then uses this information to
decide on how to service the client or the type of information to return.
◆ The general framework for this DHCP option is set out in RFC 2132
(Option 60). This information is used to convey configuration settings
or other identification information about a client, but the specific string
to use should be supplied by your service provider or network
administrator. Options 60, 66 and 67 statements can be added to the
server daemon’s configuration file.
◆ By default, DHCP option 66/67 parameters are not carried in a DHCP
server reply. To ask for a DHCP reply with option 66/67 information, the
DHCP client request sent by this switch includes a “parameter request
list” asking for this information. Besides, the client request also
includes a “vendor class identifier” that allows the DHCP server to
identify the device, and select the appropriate configuration file for
download. This information is included in Option 55 and 124.
◆ The server should reply with the TFTP server name and boot file name.
◆ Note that the vendor class identifier can be formatted in either text or
hexadecimal, but the format used by both the client and server must be
the same.
Table 48: Options 60, 66 and 67 Statements
Option
Statement
Keyword Parameter
60 vendor-class-identifier a string indicating the vendor class identifier
66 tftp-server-name a string indicating the tftp server name
67 bootfile-name a string indicating the bootfile name
Table 49: Options 55 and 124 Statements
Option
Statement
Keyword Parameter
55 dhcp-parameter-request-list a list of parameters, separated by ','
124 vendor-class-identifier a string indicating the vendor class identifier