3Com 3CR17251-91 Getting Started Guide - Page 74
Guidelines For Interconnecting Units, Unit Numbering within the Fabric
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74 CHAPTER 4: CREATING AN XRN STACKING FABRIC Guidelines For Interconnecting Units This section offers some guidelines for creating a Fabric. Using these guidelines will help prevent problems arising when setting up your Fabric. ■ The maximum number of Switch units that can be interconnected is eight. ■ It is not possible to create a Fabric by interconnecting a 3Com Switch 5500 with any other 3Com device (such as a 5500G-EI) or mix Enhanced Image (EI) Switch 5500 units with Standard Image (SI) units. ■ 3Com strongly recommends that you upgrade all Switches to be interconnected to the latest software agent. ■ 3Com recommends that you remove the configuration file from a Switch unit that has previously been used elsewhere in your network before you interconnect to an existing unit. If you do not do this, problems may be caused by conflicting Switch configurations. Use the dir command from the User View to display the configuration files stored on the Switch and locate the [filename].cfg file. Do NOT under any circumstances remove the 3comoscfg.def file (this is the default configuration file). For a detailed description of how XRN Technology operates and implementation guidelines, please refer to the Configuration Guide on the CD-ROM that accompanies your Switch. Unit Numbering within the Fabric When a Fabric is created using the Switch 5500 the unit numbering can be determined in two ways. ■ You can manually assign unit IDs 1 to 8 to specific units using the change[self-unit, unit-id] to [1-8, auto-numbering] command from the System View. If you manually assign unit IDs to a Switch via the change command the IDs will be retained after a power cycle. If you add a unit to a Fabric that has previously been manually configured with a unit ID and this conflicts with an ID already within the Fabric, then the Switch with the lowest MAC address assumes the ID in question and the other unit will automatically renumber. 3Com recommends that you manually assign the unit IDs within the Fabric if you wish to have predictability of knowing which units have which IDs at all times. ■ Fabric topology is 'discovered' and the units auto-number their IDs.