Specifications

88 Chapter 4. Configuring Special Features
Note: By default, the DHCP server does not satisfy BootP requests unless the administrator has explicitly enabled
BootP (at the subnetwork or lease level).
About BootP and DHCP
BootP and DHCP provide services that are very similar. However, as an older service, BootP offers only a
subset of the services provided by DHCP.
The main difference between BootP and DHCP is that the client lease expiration for a BootP client is always
infinite.
Note: Remember, when BootP is enabled, the client assumes that the lease is infinite.
Enable/Disable BootP
To allow BootP request processing for a particular client/subnet, use the command:
dhcp bootp allow <net>|<ipaddr>
To disallow BootP request processing for a particular client/subnet, type:
dhcp bootp disallow <net>|<ipaddr>
Specify the Boot (TFTP) Server
The following commands let the administrator specify the TFTP server (boot server) and boot file name. The
administrator should first configure the IP address of the TFTP server and file name (kernel) from which to
boot.
To set the IP address of the server and the file to boot from, use the commands:
dhcp bootp tftpserver [<net>|<ipaddr>] <tftpserver ipaddr>
dhcp bootp file [<net>|<ipaddr>] <file name>
To clear the IP address of the server and the file to boot from, use:
dhcp bootp tftpserver [<net>|<ipaddr>] 0.0.0.0
Example 1:
To set the global BootP server IP address to 192.168.254.7:
dhcp bootp tftpserver 192.168.254.7
Example 2:
To set the subnet 192.168.254.0 server IP address to 192.168.254.8:
dhcp bootp tftpserver 192.168.254.0 192.168.254.8
Example 3:
To set the client 192.168.254.21 server IP address to 192.168.254.9
dhcp bootp tftpserver 192.168.254.21 192.168.254.9
Example 4:
To set the subnet 192.168.254.0 boot file to Òkernel.100Ó:
dhcp bootp file 192.168.254.0 kernel.100
Example 5:
To clear the global BootP server IP address and file name:
dhcp bootp tftpserver 0.0.0.0