Cisco Systems OL-6240-02 Manual De Usuario

This chapter describes how to set up some of the more advanced DHCP server properties. Before clients 
can use DHCP for address assignment, you must add at least one scope to the server. This is described 
in 

 The additional properties are:

BOOTP (the BOOTstrap Protocol) was originally created for loading diskless computers. It was later 
used to allow a host to obtain all the required TCP/IP information to use the Internet. Using BOOTP, a 
host can broadcast a request on the network and get information required from a BOOTP server. The 
BOOTP server is a computer that listens for incoming BOOTP requests and generates responses from a 
configuration database for the BOOTP clients on that network. BOOTP differs from DHCP in that it has 
no concept of lease or lease expiration. All IP addresses that a BOOTP server allocates are permanent.

You can configure Cisco CNS Network Registrar to act like a BOOTP server. In addition, although 
BOOTP normally requires static address assignments, you can choose to either reserve IP addresses 
(and, therefore, use static assignments) or have IP addresses dynamically allocated for BOOTP clients.

When you configure the DHCP server to return a BOOTP packet, be aware that BOOTP requires 
information in the DHCP packet in fields other than the option space. BOOTP devices often need 
information in the boot file (file), server’s IP address (siaddr), and server’s host name (sname) fields of 
the DHCP packet (see RFC 2131).