3Com 4500 Getting Started Manual

Also see for Switch 4500 Family: Product guide Datasheet Datasheet Datasheet Datasheet

Contents

3Com 4500 Getting Started Manual Manual pdf 55 page image

Solving Communication Problems 55SolvingCommunicationProblemsIf 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 has been entered correctly in your networkmanagement application (such as 3Com Network Director).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 byanother device on your network. 3Com suggests you use addresses in the range192.168.0.0 to 192.168.255.255 with a subnet mask of 255.255.255.0.These suggested IP addresses are part of a group of IP addresses that have beenset aside specially for use ‘in house’ only.A device is connected to a Switch 4500 PWR but power is not beingsuppliedIf power is not being supplied to a device connected to a Switch 4500 PWR, youshould do the following checks:■ Check that the device is compliant with the 802.3af standard ref. [18].