3Com 1000 User Manual

Also see for SuperStack 3 WEBCACHE 1000: User guide Mounting guide Release notes User guide

Contents

Setting Up the Switch Unit 4-11SDB Ageing Time This field allows you to specifythe ageing time (hours:minutes) for all non-perma-nent entries in the Switch Database of the unit.You can set an ageing time in the range 0 minutesto 277 hours, with a default of 30 minutes. If youenter 0:00, ageing is turned off. For more informa-tion about ageing times, refer to “Setting Up theSwitch Database (SDB)” on page 4-16.Spanning Tree Enable / Disable This field allowsyou to enable or disable the Spanning Tree Protocol(STP) on the Switch. For more information aboutSTP, refer to “Spanning Tree Protocol” on page5-12.Duplex Mode Half Duplex / Full Duplex on 100MPorts / Full Duplex on all Ports This field allows youto set the duplex mode of ports that have UnitDefault specified in the Duplex Mode field of thePort Setup screen. The default setting is Half Duplex.For more information about Duplex Mode, refer to“Setting Up the Switch Ports” on page 4-12.Backbone Port 1 / 2 / 3 / ... 24 / 25 / 26(3C16900A) 1 / 2 / 3 /...12 / 13 / 14 (3C16901A)If the Bridging Mode field is set to Forward to Back-bone, and all the ports on the Switch belong toVLAN 1 and use Port VLAN Mode, then this fieldallows you to specify a backbone port for theSwitch. In all other situations, the field is not dis-played.On a new or initialized Switch, all ports belong toVLAN 1 and use Port VLAN Mode.For more information about VLANs, refer to “Vir-tual LANs (VLANs)” on page 5-1. For more informa-tion about backbone ports and their role in VLANfunctionality, refer to “Setting Up VLANs on theSwitch” on page 5-8.Default RMON Host/Matrix Enable / Disable Thisfield allows you to enable (start) Hosts and MatrixRMON sessions on the Default VLAN, or disable(stop) existing sessions if they are no longerrequired. The default setting for this field is Disable.For more information about RMON sessions, refer to“RMON” on page 5-22.Plug-in Module Type This read-only field displaysthe type of Plug-in Module fitted to the rear of theunit, or displays Not Fitted.Transceiver Module Type This read-only fieldshows the type of Transceiver Module fitted to therear of the unit, or displays Not Fitted.Power Supply Internal / External This read-onlyfield displays External if the Switch is receivingpower from a Redundant Power System. In allother cases, this field displays Internal.