3Com 3 manual How Your Switch, Obtains IP, Information, How Automatic IP, Works

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70CHAPTER 9: USING AUTOMATIC IP CONFIGURATION

How Your Switch	You can use one of the following methods to allocate IP information to
Obtains IP	your Switch (essential if you wish to manage your Switch across the
Information	network):
	■ Automatic IP Configuration (default) — the Switch tries to
	configure itself with IP information. It uses the following industry
	standard methods to automatically allocate the Switch IP information:
	■ Dynamic Host Configuration Protocol (DHCP)
	■ Auto-IP — the Switch will configure itself with its default IP address
	169.254.100.100 if it is operating in a standalone mode, and/or no
	other Switches on the network have this IP address. If this default
	IP address is already in use on the network then the Switch detects
	this and configures itself with an IP address in the range
	169.254.1.0 to 169.254.254.255.
	■ Bootstrap Protocol (BOOTP)
	For ease of use, you do not have to choose between these three
	automatic configuration methods. The Switch tries each method in a
	specified order as described in “Automatic Process” on page 71.
	■ Manual IP Configuration — you can manually input the IP
	information (IP address, subnet mask, and default gateway).
	If you select an option for no IP configuration the Switch will not be
	accessible from a remote management workstation on the LAN. In
	addition, the Switch will not be able to respond to SNMP requests.

How Automatic IP	When your Switch is powered up for the first time the IP configuration
Configuration	setting is set to automatic — this is the default setting.
Works	If your Switch has been powered up before, whichever of the three

	options for IP configuration (manual, automatic, none) was last
	configured is activated when the Switch powers up again.

You can switch to manual IP configuration at any time using a serial port connection to set up the IP information. For more information see the Getting Started Guide that accompanies your Switch.

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Contents SuperStack 3Com Corporation 5400 Bayfront Plaza Santa Clara, California Contents Using Multicast Filtering Status Monitoring and Statistics IP Addressing About this Guide Conventions List conventions that are used throughout this guideComments RelatedDocumentation Pddtechpubscomments@3com.comProduct RegistrationSwitch Features Page Management What isSwitch Features Software?Switch Features Overview Duplex Ports operating at 1000 Mbps only support full duplex modeFor more information about multicast filtering, see Using Flow ControlFor more information about STP and RSTP, see Using Resilience FeaturesFor more information about Quality of Service, see Using Quality of ServiceEvent Notification For more information about VLANs, see Setting Up Virtual Port Features Ports operating at 1000 Mbps support full duplex mode only Port Features Switch units connected using an aggregated link Aggregated Links Traffic Distribution and Link Failure on Aggregated Links 2 Gbps aggregated link between two Switch units Optimizing Bandwidth Using Multicast Filtering Relevant multicast groupUsing Multicast Filtering Snooping Mode Query modeQuery Mode Igmp multicast filtering works as follows Igmp v2 protocolThat support IP Enabling Igmp Multicast LearningIgmp Multicast Filtering Using Multicast Filtering Protocol STP Spanning TreeNetwork Ieee 802.1w standard What is STP? Traffic flowing through Bridge B Port Speed Link Type Path Cost 802.1D-1998 802.1w Using Resilience Features Port costs in a network Configuration 2 Redundancy through Meshed Backbone Configuration 1 Redundancy for Backbone LinkConfiguration 3 Redundancy for Cabling Error STP configurations Network with Default BehaviorUsing STP on a Multiple VLANsConfiguration that separates VLANs Using Resilience Features Database? What is the SwitchHow Switch Database EntriesSwitch Database Entry States Databases entries can have three statesAvailable What is TrafficPrioritization? Converged network applications Used by organizations with a802.1D Priority Levels How Traffic Prioritization Works Your Switch Traffic PrioritizationHow traffic is processed to provide Quality of Service Configuring traffic prioritization for QoS on a SwitchUsing Traffic Prioritization Network efficiency and reduce the load on your network What is RMON?That allows you to monitor the traffic of LANs or VLANs Events AlarmsIt improves your efficiency Switch RmonLow Threshold Statistic High Threshold Recovery Period Low Threshold Statistic High Threshold Recovery Status Monitoring and Statistics Hardware Status Monitoring Example device summary web Setting UP Virtual Lans VLANs ease the movement of devices on networks VLANs provide extra securityVLANs help to control traffic Membership Creating an Ieee 802.1Q Tagged LinkTwo Vlans connected via a router Configure the VLANs ConfigurationUsing Untagged ExamplesAdd endstation ports on Switch 1 to the VLANs Configure the VLANs on SwitchAdd ports to the VLANs Add port 11 on Switch 2 to the VLANs Add port 12 on Switch 1 to the VLANsAdd endstation ports on Switch 2 to the VLANs Check the Vlan membership for both switchesConfiguration Information How Your SwitchObtains IP How Automatic IPHow Automatic IP Configuration Works That a Switch may change its IP address whilst in use Automatic IP configuration featureConsiderations Glossary Configuration RulesIP Addressing IndexPage Configuration Rules Configuration Rules for Gigabit EthernetFast Ethernet configuration rules Configuration Rules for Fast Ethernet Appendix a Configuration Rules Network This chapter contains the following sectionsFamily and 4900 family can be used in your network Segments are connected to the Switch which is positionedSimple Network ExampleDual Speed Hub Switch Resilience of Your Advanced NetworkImproving NetworkPerformance EnhancingTherefore the overall network performance IP Addresses Simple OverviewObtaining a Registered IP Address IP AddressDecimal value of an octet whose bits are all 1s is Dotted Decimal NotationNetwork Portion Subnet mask Subnet Mask Numbering Extending the Network PrefixOr leave the field blank Glossary Glossary Ethernet address EndstationEthernet Fast EthernetHub GatewayHalf duplex Ieee 802.1DLine speed See baud Glossary Rstp See Rapid Spanning Tree Protocol STP See Spanning Tree Protocol STP Page Glossary Index NumbersIgmp multicast filtering 30 Internet Addresses 85 InterNIC Sub-networks. See subnets Switch Database

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