Chapter 3 Operation; Bridging - Cabletron Systems SmartSwitch 9000 User Manual

Operation
The 9T122-08 MicroLAN Module provides connectivity between the front panel
Token Ring(s) and the FDDI rings on the backplane (FNB-1 or FNB-2).
SmartSwitch 9000 modules connect to either the Internal Network Bus (INB) or
the Flexible Network Bus (FNB) bus. The 9T122-08 module connects to the FNB
bus. Figure 3-1 is a block diagram of the module. The two front panel rings
function as individual networks, each with four ports. Bridging may occur
between these two rings and/or to any other SmartSwitch 9000 module via the
Flexible Network Bus.
Four
Front Panel
Connections
and RI/RO
Four
Front Panel
Connections
and RI/RO

Bridging

The 9T122-08 is configured for SR-TB bridging. It will pass SR (Source Routing)
frames between the rings and provides translation to transparent frames over the
FNB to Ethernet and FDDI modules. For information on configuring the bridging
function, see the addendum to the SmartSwitch 9000 Local Management User's
Guide, containing information specific to this model.
DC/DC
Converter
System
Diagnostic
Controller
i960 PLUS Core
Figure 3-1. 9T122-08 Block Diagram
Chapter 3
SMB-1
SMB-10
FNB-1 or
FNB-2
3-1