- 3Com Switch Owner Manual

Bridging 15
T0008-16F Release 5.2M
Basic Remote Bridging Examples
Basic Remote Bridging Examples
Introduction This section shows some common examples of bridging applications using
PathBuilder S200 series switches.
Remote Bridging
Across a WAN
Figure 9 shows a common Source Route Bridging operation for PathBuilder S200
series switches where two Token Ring LANs are attached across a WAN. For
example, two LANs could be bridged using two PathBuilder S200 series switches
interconnected by an X.25 or Frame Relay link. Bridged traffic flows between the
bridges over a Switched Virtual Circuit (SVC) that connects them together across the
WAN (or Permanent Virtual Circuit (PVC) for Frame Relay).
Figure 9. PB S200s Connecting LANs via an X.25/Frame Relay Link
Extended Bridging
for Multiple LANs
If more than two remote LANs are involved in your bridging application, the bridge
arrangement can be extended so that individual LAN pairs are connected by different
bridges, as shown in Figure 10.
Figure 10. Two-Port Bridges Connecting Multiple Token Ring LANs
In this example, each pair of LANs is connected by a single bridge formed by bridge
pairs.
• Bridge 1 interconnects Token Ring 1 and Token Ring 2
• Bridge 2 interconnects Token Ring 1 and Token Ring 3
• Bridge 3 interconnects Token Ring 2 and Token Ring 3
Token
Ring 1
Token
Ring 2
PBS200
Node 1
PBS200
Node 2
X.25/Frame Relay
Token
Ring 1
Token
Ring 2
Node 1
Bridge 1
Bridge 2
Bridge 1
Bridge 3
Bridge 2
Bridge 3
Token
Ring 3
Node 2
Node 3
SVC Connectors
(PVC for Frame Relay)