Bay Networks 5390, Administering, Page: 74 / 888

A2-14 893-741-B
Configuring the Model 5390 Server
Using the Trivial File Transfer Protocol
The Trivial File Transfer Protocol (tftp) is a standard network interface loading program. The Model
5390 operational code opens and reads the operational image, configuration, and motd files. The
Model 5390 server accesses one file at a time.
The Model 5390 server initially tries to open a file using erpcd (except when using the self-boot
option). If erpcd fails or times out, the Model 5390 server tries to open a file using tftp. If the tftp
request fails or times out, the Model 5390 server retries opening the file using erpcd. This cycle
continues until the Model 5390 server succeeds in opening the file or until it reaches a maximum
try count (currently 8 cycles). If the load_broadcast parameter is enabled and the Model 5390
server cannot open a file from the pref_load_host, it broadcasts the open request
(this is true for both erpcd and tftp). Once a file is successfully opened, the Model 5390 server
continues to read it using the protocol with which it was opened.
The protocol used to transfer one file is independent of the protocol used to transfer another file.
For environments that support both erpcd and tftp, the Model 5390 server may use tftp to transfer
one file and erpcd to transfer another file.
Using Model 5390 Security
The Model 5390 server provides a security system that allows you to implement as many security
measures as the network requires. You can set up the security subsystem to use host-based security,
local password protection, or a combination of the two. In addition to these security mechanisms,
the Model 5390 server provides an administrative password that validates access through the
administrative tools.
For a detailed description of Model 5390 security, see Using Model 5390 Security starting on page
A15-1.
NOTE: If unauthorized users can access your Model 5390 server,
Bay Networks strongly suggest that you enable the security features
after loading the host code and booting the unit.