Product specifications

Chapter 4: System Management Efficient Networks
®
Router family
Technical Reference Guide
Page 4-12 Efficient Networks
®
Configuring BootP/DHCP Relays
BootP/DHCP relays are used by system administrators when the DHCP configuration
parameters are acquired from a BootP/DHCP server other than the router’s DHCP
server.
This function allows configuration information to be centrally controlled. Enabling a
BootP/DHCP relay disables DHCP on the router because, by definition, only one
policy mechanism can be supported.
However, multiple relays may be specified. BootP/DHCP requests are forwarded to
every relay on the list. It is assumed, in this case, that the multiple servers are
configured to recognize the requests that they are to handle.
To add a BootP/DHCP Relay address to the list, use the command:
-> dhcp addrelay <ipaddr>
To remove a BootP/DHCP Relay address from the list, use the command:
-> dhcp delrelay <ipaddr>
Defining Option Types
A DHCP option is a code, length, or value. An option also has a “type” (byte, word,
long, longint, binary, IP address, string).
The subnet mask, router gateway, domain name, domain name servers, NetBios
name servers are all DHCP options. Refer to RFC 1533 if you require more
information.
Users will normally not need to define their own option types. The list of predefined
option types based on RFC 1533 can be shown by using the dhcp list definedoptions
command.
Commands
The following commands are available for adding/deleting option types:
-> dhcp add <code> <min> <max> <type>
To list option types that are currently defined, enter:
-> dhcp list definedoptions...
To list the definitions for all known options, enter:
-> dhcp list definedoptions
To list the definition for option 1, if option 1 is defined, type:
-> dhcp list definedoptions 1