3Com 3812 - SuperStack 3 Switch Getting Started Manual

Also see for 3C17400: Getting started guide Implementation guide Implementation guide Datasheet

Contents

3Com 3812 - SuperStack 3 Switch Getting Started Manual Manual pdf 31 page image

Setting Up Overview 31CAUTION: To protect your Switch from unauthorized access, you mustchange all three default passwords as soon as possible, even if you do notintend to actively manage your Switch. For more information on defaultusers and changing default passwords, see “Default Users andPasswords” on page 44.IP Configuration You can use one of the following methods to allocate IP information toyour Switch (essential if you wish to manage your Switch across thenetwork).Manual IP ConfigurationYou can choose to configure the IP information yourself. The Switchremembers the information that you enter until you change it again orset the configuration method to Automatic.You should use the Manual IP configuration method if:■ you do not have a DHCP server on your network, or■ you want to remove the risk of the IP address ever changing, or■ your DHCP server does not allow you to allocate static IP addresses.(Static IP addresses are necessary to ensure that the Switch is alwaysallocated the same IP information.)For most installations, 3Com recommends that you configure the SwitchIP information manually. This makes management simpler and morereliable as it is not dependent on a DHCP server, and eliminates the risk ofthe IP address changing.If you wish to manually enter IP information for your Switch, workthrough the “Manually Configuring IP Information” section on page 32.Automatic IP ConfigurationBy default the Switch tries to configure itself with IP information withoutrequesting user intervention. It tries to obtain an IP address from a DHCPserver on the network.It may take up to 5 minutes for your Switch to obtain an IP address afterit has been powered up.When using automatic IP configuration it is important that the IP addressof the Switch is static, otherwise you will not know what the IP address isand it will be difficult to manage. Most DHCP servers allow static IPdua1740-0aaa03.book Page 31 Thursday, December 23, 2004 9:23 PM