Visara CNA-8000 Planning Guide - Manual (Page 20)

Chapter 2. Support of PU 2 Platforms
2-6 707156-002
Migrating from a Mixed Ethernet/Token Ring Environment to Ethernet Only
Some environments have the majority, if not all downstream nodes attached to Ethernet
with an Ethernet/Token Ring bridge used to convert the Ethernet traffic to Token Ring in
order to connect through a 3745 Token Ring gateway. With the CNA-8000 capability to
gateway the traffic directly from Ethernet it should be possible to eliminate the
Ethernet/Token Ring bridge entirely. Chances are that if you check the configuration of
MAC addresses in the DSPUs for their gateway, the address configured is not the same
hex value as configured on the 3745 that it is communicating with, but may be the bit-
swapped address instead. This is because the bit order (most significant bit to least
significant bit) is reversed between Token Ring and Ethernet. If this is the case you
should be able to configure the MAC address defined in the configuration of your
Ethernet attached DSPUs for their gateway into the CNA-8000 (instead of using the
MAC address defined for use in the 3745). This should prevent you from having to
reconfigure the DSPUs that will use the CNA-8000 as the new gateway. A description of
the bit swap process can be found below.