3Com 3C17700 - SuperStack 3 Switch 4900 Getting Started Manual page 26

26 C 2: I
HAPTER NSTALLING THE
S
WITCH
Only 3Com XRN Interconnect Cables can be used to connect two XRN
Interconnect Modules.
It is not possible to interconnect the SuperStack 3 Switch 4900 Family
and 3Com Switch 40x0 units with any other 3Com device.
3Com strongly recommends that you upgrade all Switches to be
interconnected to the latest software agent.
3Com recommends that you initialize a Switch unit that has previously
been used elsewhere in your network before you interconnect to an
existing unit. If you do not initialize the unit, problems may be caused
by conflicting Switch configurations.
When the Switch units are interconnected using the XRN Interconnect
Kit they are assigned a unit number dependent on which XRN
Interconnect Cable end is connected to which Switch. That is, the
Switch with the blue cable end will be assigned the identity of Unit 1
and the Switch with the yellow cable end will be assigned the identity
of Unit 2.
When the Switch units are in an XRN Distributed Fabric created using
the GBIC Module, they assume their unit IDs from the MAC address of
the Switch unit within which the GBIC Module is installed. So the unit
with the lowest MAC address will assume Unit 1 ID and the unit with
the highest MAC address will assume Unit 2 ID.
To create an XRN Distributed Fabric using a GBIC Module you will
need GMS software version 4.0 or later (Advanced Feature License
3C1770V40) to be installed on both Switch units.
Only direct XRN mode to XRN mode connections are supported when
the GBIC Module is operating in XRN mode.
For a detailed description of how XRN Technology operates and
implementation guidelines, please refer to the Implementation Guide on
the CD-ROM that accompanies your Switch or on the 3Com Web site.