3Com OfficeConnect 3C16710 User Manual

Also see for OFFICECONNECT ETHERNET HUB 8: Manual User guide User guide User guide Datasheet

Contents

4-34 CHAPTER 4: MANAGI NG YOUR HUB USING QUICK CONFIG M ANAGERResilient Links are available over twisted pair media(10BASE-T) because it carries a link test pulse which isused to decide whether the main link has failed andthe standby link should take over. However, there isno such link signal over coaxial media (10BASE-2), soyou cannot set up resilient links using the hub’s10BASE-2 (Coax) port.If you have more than two hubs there are a numberof ways you can use resilience when linking them.Remember to follow hub connection requirements;always connect an MDIX port to an MDI port, settingthe MDIX switch as appropriate, see “ConnectingHubs Using 10BASE-T” on page 2-10.When your network is in use, the hub that has beenused to set up the resilient link pair, monitors thestate of both the main link and the standby link. Ifthe main link fails, the standby link becomes active. Ifthe fault with the main link is solved, the standby linkstays active and the main link acts like a standby link.You can use management to view the status of yourlinks, and to send traps (messages) to an IP/IPX-basednetwork management application, if anythingchanges.Setting Up a Resilient Link PairTo set up a resilient link pair, you need to managethe hub that both links in the pair are connected to.You can set up to 4 resilient link pairs for the hub.When you set up your resilient link pair, you onlyneed to specify the ports that the main link andstandby link are connected to.Resilient Link RulesAlways follow these rules when setting up a resilientlink pair:n Configure the resilient link pair at only one end ofthe link. In other words, only one hub controls eachresilient link pair you set up.n Each resilient link pair can only have one main linkand one standby link.n Each link must not belong to more than one resilientlink pair.n For a port that is part of a resilient link pair:n Do not disable the link pulse generation.n Do not enable security for the port.16710.bk : MANAGING.FRM Page 34 Tuesday, October 7, 1997 11:38 AM