3Com 4210 Getting Started

Also see for 4210 Series: Product guide Getting started Datasheet Product guide Product guide

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54 CHAPTER 4: P ROBLEM SOLVINGError message indicating that the SFP transceiver is invalidThe switch has identified that the SFP does not meet the minimum requirementsfor the switch and has disabled the port. To correct this problem, completelyremove the SFP and replace it with a 3Com approved SFP.Error message indicating that the SFP transceiver is faultyTo correct this problem, completely remove the SFP and then reinsert it.Alternatively, insert another identical SFP. If the problem persists, contact 3ComTechnical Support.SolvingCommunicationProblemsIf you experience communication problems with the switch, ensure that:■ The switch IP address and Management VLAN ID has been configured.■ If the switch is separated from your management application by a router,ensure that the default gateway IP address within the switch is the same as theIP address of the router.■ The switch’s IP address was discovered correctly by your network managementapplication.The following is a brief overview of IP addressing, and how to obtain a registeredIP address.IP AddressingTo be managed correctly, each device on your network (for example a switch orHub) must have a unique IP address. IP addresses have the format n.n.n.n where nis a decimal number between 0 and 255. An example IP address is 192.168.100.8.The IP address is split into two parts:■ The first part (‘192.168.100’ in the example) identifies the network on whichthe device resides■ The second part (‘.8’ in the example) identifies the device within the networkThe natural subnet mask for this example is 255.255.255.0.If your network has a connection to the external IP network, that is, you access theInternet, you must apply for a registered IP address.How do you obtain a registered IP Address?The IP registration system ensures that every IP address used is unique; if you donot have a registered IP address, you may be using an identical address tosomeone else and your network will not operate correctly.InterNIC Registration Services is the organization responsible for supplyingregistered IP addresses. The following contact information is correct at time ofpublication:World Wide Web site: http://www.internic.netIf your IP network is internal to your organization only, that is, you do not accessthe Internet, you may use any arbitrary IP address as long as it is not being used by