3Com 1000 User Manual

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

Contents

About the Switch 1000 1-5For more information about enabling full duplex,refer to “Setting Up the Switch Unit” and “SettingUp the Switch Ports” in Chapter 4.SecurityThe Switch 1000 contains advanced security fea-tures which guard against users connecting unau-thorized endstations to your network. When securityis enabled on a port, it enters single address learn-ing mode. In this mode, the port learns a singleEthernet address; once this is learned, the port isdisabled if a different address is seen on the port.Until security is disabled, no other address can belearned.For more information about security, refer to “Set-ting Up the Switch Ports” on page 4-12.Resilient LinksThe Resilient Link feature in the Switch 1000enables you to protect critical links and prevent net-work downtime should those links fail.Setting up resilience ensures that should a maincommunication link fail, a standby duplicate linkimmediately and automatically takes over the task ofthe main link. Each main and standby link pair isreferred to as a resilient link pair.For more information about resilient links, refer to“Setting Up Resilient Links” on page 4-19.Virtual LANsThe Switch 1000 has a Virtual LAN (VLAN) featurewhich allows you to build your network segmentswithout being restricted by physical connections. AVLAN is defined as a group of location- andtopology-independent devices that communicate asif they are on the same physical LAN. ImplementingVLANs on your network has three main advantages:n It eases the change and movement of devices onIP networks. If an endstation in VLAN 1 is movedto a port in another part of the network, youonly need to specify that the new port is inVLAN 1.n It helps to control broadcast traffic. If an endsta-tion in VLAN 1 transmits a broadcast frame,then only VLAN 1 devices receive the frame.n It provides extra security. Devices in VLAN 1 canonly communicate with devices in VLAN 2 usinga router.For more information about setting up VLANs onthe Switch, refer to “Virtual LANs (VLANs)” on page5-1.Spanning Tree ProtocolThe Switch 1000 supports the Spanning Tree Proto-col (STP) which is a bridge-based system for provid-ing fault tolerance on networks. STP allows you toimplement parallel paths for network traffic, andensure that:n Redundant paths are disabled when the mainpaths are operational.