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This soft copy for use by IBM employees only.
Note
If the module is configured for source route switching, all token-ring LAN
ports
and
emulated token-ring LAN ports share the same ring number.
4.9.2 Sample Scenarios
The 8285 LAN switching modules complement the IBM 8285 Base Unit′s
cost-effective ATM25 capabilities and can serve as the basis for a smooth
migration from traditional shared-media LANs to the high-performance ATM
networks of the future. Here are some scenarios that could be implemented.
4.9.2.1 Stand-Alone Token-Ring Migration
In this scenario, a workgroup of 80 users and 4 servers has run out of bandwidth
on its local token-ring network. A very simple way to alleviate this constraint is
to implement an 8285 switch with a 3-slot 8272 ATM/LAN Switch Module right in
the same wiring closet, as illustrated in Figure 30.
Figure 30. Relieving Token-Ring Congestion with LAN Switching Module
The first change to make is to move all four servers off of the common ring and
give them dedicated bandwidth. If we use full-duplex token-ring adapters, such
as the IBM Auto LANStreamer MC32 Adapter or the IBM Auto LANStreamer PCI
Adapter, we can enable the servers for full-duplex operation, connect them to a
LAN switch port, and let the LAN switch module automatically provide each
server with 32 Mbps of dedicated bandwidth.
In addition, if we choose we can take advantage of the 8285 switch′s 155 Mbps
ATM port by installing a high-performance ATM adapter, such as the IBM
Turboways 155 Mbps adapter, in our most heavily used server.
Chapter 4. IBM 8285 ATM Modules 77