- 3Com Switch Owner Manual

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

WA N

Network

PB S200

Bridge

PB S200

Bridge

PB S200

Bridge

LAN

xxx

LAN

CCC

LAN

zzz

Server