EXP Computer PathBuilder S200 - Manual (Page 46)

42 Bridging
Configuring the PathBuilder S200 Series Switch for Bridging Operation
Connecting a Station to a Server in Source Route Bridging
Introduction The following is an example of the process involved in establishing a connection
between a station on one Token Ring LAN with a server on a remote Token Ring
LAN for a Source Route Bridging operation.
Procedure These steps describes the process of how a a station to server connection is set up:
1) The PC station (source) on LAN AAA requests a session to a server (destination)
located on remote LAN CCC (Figure 21).
Figure 21. Example of a Station to Server Configuration
2) The PC assumes the server is on the local LAN, and the PC sends an LLC frame
(typically an LLC1 TEST frame) around its local LAN AAA looking for a
response from the server. The TEST frame has a destination MAC Address equal
to the server’s MAC Address. Since the server is not on the local ring, no station
responds to the server’s destination MAC Address (Figure 22). This TEST frame
does not have the Routing Information Indicator bit (RII) set (the high order bit in
the Source MAC Address) and as a result, it does not build a Routing Information
Field (RIF) to trace the path to the destination.
LAN
AAA
PB S200
Bridge
WAN
Network
PB S200
Bridge
PB S200
Bridge
PB S200
Bridge
LAN
xxx
LAN
CCC
LAN
zzz
PC
Server