3Com PathBuilder S200 Series Owner's Manual page 50

Configuring the PathBuilder S200 Series Switch for Bridging Operation
PC
PB S200
Bridge
LAN
Port
LAN
1
AAA
46
8) The server issues a Specific Route TEST frame (also called a non-broadcast
frame) in response using the route indicated in the ARE TEST frame. Note that
the server does not have to broadcast (use ARE) to get the TEST response back to
the PC; it uses a Specifically Routed TEST frame (Figure 26).
5
WAN
Adaptor
6
7
Figure 26. Server Responds with Specifically Routed TEST Frame
9) The response TEST frame also has a Routing Information Field (RIF) with the
same path trace as the original ARE TEST frame except the Direction bit is set to
1. This reverses the direction in which the RIF sequence is read and indicates the
path back to the source. The RIF also sets three bits in the Routing Type field that
indicate the frame is to be specifically routed and not broadcast.
10) When the response TEST frame reaches the source PC, the PC now knows what
route to use to send its frames to the server.
PB S200
WAN
WAN
Adaptor
Network
Server
Bridge
5
LAN
Port
LAN
1
6
CCC
7
Bridging