
Configuring IP Services
2-14
The router can send ARP packets over an interface configured for a Token Ring
network. Bay Networks supports both spanning tree explorer (STE) and all route
explorer (ARE) ARP packets.
Configuring the Trivial File Transfer Protocol
The Trivial File Transfer Protocol (TFTP) is a TCP/IP standard protocol for
transferring files with minimum capability and minimal overhead. TFTP is
implemented on top of the unreliable connectionless datagram delivery service
and is used to move files between network devices.
TFTP was designed to be small and easy to implement. Because it is small, it is
more restrictive, lacking most of the features of the File Transfer Protocol (FTP).
TFTP provides inexpensive, unsophisticated file-transfer service only. It cannot
list directories and provides no authentication.
TFTP runs on top of the User Datagram Protocol (UDP) and uses timeout and
retransmission to ensure that data arrives. Each file transfer begins with a request
to read or write to a file; this request also serves to ask for a connection. If the
server grants the request, the connection is opened and the file is sent in fixed-
length blocks (data packets) of 512 bytes. Each data packet contains one block of
data and must be acknowledged by an acknowledgment packet before the next
packet is sent. A data packet of less than 512 bytes terminates the transfer.
If a packet gets lost in the network, the intended recipient will time out and may
retransmit its last packet (which can be data or an acknowledgment), causing the
sender of the lost packet to retransmit the packet. Because the lock-step
acknowledgment guarantees that all older packets have been received, the sender
keeps one packet only on hand for transmission.
Both devices involved in a TFTP transfer are senders and receivers. One device
sends data and receives acknowledgments; the other device sends
acknowledgments and receives data.
Site Manager allows you to configure source-route endnode support on a per-circuit
basis. For instructions, see the TR Endstation parameter on page 2-43. Site Manager
also allows you to select STE or ARE ARP packets. For instructions, see the TR
Endstation ARP Type parameter on page 2-51.
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