3Com 4500 Getting Started Manual

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3Com 4500 Getting Started Manual Manual pdf 86 page image

86 Appendix F: C REATING A STACKThe 3Com Switch 4500 supports stacking by daisy-chaining from unit to unit overstandard Gigabit Ethernet connections. Resilient stacking, with a return loop frombottom to top of a stack, is not supported and will disable stack operation.■ The maximum number of Switch units that can be interconnected is eight.■ You can only create a stack by interconnecting a 3Com Switch 4500 with other3Com Switch 4500s.■ Stacking is only supported using Gigabit ports.■ The stacking connections must be from one combo port pair on a unit to theopposite combo port pair on the next unit. Refer to Figure 18 to see how thislooks in a stack of units.■ The stacking ports must be configured for “fabric mode” before they can beused for stacking. By default, fabric mode is enabled for ports 25/26 and49/50. The configuration can be changed to move fabric mode to the otherport pair; this requires a reboot of the system.■ 3Com strongly recommends that you upgrade all Switches to beinterconnected to the latest software agent.■ 3Com recommends that you remove the configuration file from a Switch unitthat has previously been used elsewhere in your network before youinterconnect to an existing unit. If you do not do this, problems may be causedby conflicting Switch configurations. Use the dir command from the UserView to display the configuration files stored on the Switch and locate the[filename].cfg file. Do NOT under any circumstances remove the3comoscfg.def file (this is the default configuration file).■ When a port is operating in stack mode it will no longer be configurable in thenormal way, that is, you cannot control port features such as auto-negotiation,VLANs, static addresses, STP, Aggregated Links, Resilient Links, and so on.However, it is possible to specify the stack VLAN.Figure 18 Stack example (using 4 units)Unit Numberingwithin the StackWhen a stack is created using the Switch 4500 the unit numbering can bedetermined in two ways.■ You can manually assign unit IDs 1 to 8 to specific units using thechange[self-unit, unit-id] to [1-8, auto-numbering]command from the System View. If you manually assign unit IDs to a Switch viathe change command the IDs will be retained after a power cycle.3CR17561-91 SuperStack 3 Switch 4500 26-Port1000BASE-X10/100BASE-TX 10/100/1000BASE-TSpeed: (100Base-TX) Green = 100Mbps Yellow = 10Mbps (1000Base-X) Green = 1000Mbps Yellow = 10/100Mbps Duplex: Green = Full Duplex, Yellow = Half Duplex2625 25 263CR17561-91 SuperStack 3 Switch 4500 26-Port1000BASE-X10/100BASE-TX 10/100/1000BASE-TSpeed: (100Base-TX) Green = 100Mbps Yellow = 10Mbps (1000Base-X) Green = 1000Mbps Yellow = 10/100Mbps Duplex: Green = Full Duplex, Yellow = Half Duplex2625 25 263CR17561-91 SuperStack 3 Switch 4500 26-Port1000BASE-X10/100BASE-TX 10/100/1000BASE-TSpeed: (100Base-TX) Green = 100Mbps Yellow = 10Mbps (1000Base-X) Green = 1000Mbps Yellow = 10/100Mbps Duplex: Green = Full Duplex, Yellow = Half Duplex2625 25 263CR17562-91 SuperStack 3 Switch 4500 50-PortPWRRPSDuplex:Green = Full Duplex, Yellow = Half DuplexSpeed:Green = 100Mbps, Yellow = 10Mbps49 50 49 502252

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