3Com 3 manual Spanning Tree, Protocol STP, Network

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4	USING RESILIENCE FEATURES

	Setting up resilience on your network helps protect critical links against
	failure, protects against network loops, and reduces network downtime
	to a minimum.
	This chapter explains the features supported by the Switch that provide
	resilience for your network. It covers the following topics:
	■ Spanning Tree Protocol (STP)
	■ Rapid Spanning Tree Protocol (RSTP) — an enhanced STP feature.
	For detailed descriptions of the web interface operations and the
	command line interface (CLI) commands that you require to manage the
	Switch please refer to the Management Interface Reference Guide
	supplied in HTML format on the CD-ROM that accompanies your Switch.

Spanning Tree	The Spanning Tree Protocol (STP) makes your network more resilient to
Protocol (STP)	link failure and also provides a protection from loops — one of the major
	causes of broadcast storms. STP is enabled by default on your Switch.
	To be fully effective, STP must be enabled on all Switches in your
	network.
	The following sections explain more about STP and the protocol features
	supported by your Switch. They cover the following topics:
	■	What is STP?
	■	How STP Works
	■ Using STP on a Network with Multiple VLANs

The protocol is a part of the IEEE 802.1D bridge specification. To explain STP more effectively, your Switch will be referred to as a bridge.

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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 List conventions that are used throughout this guide ConventionsDocumentation RelatedComments Pddtechpubscomments@3com.comRegistration ProductSwitch Features Page Switch Features What isManagement Software?Switch Features Overview For more information about multicast filtering, see Using Ports operating at 1000 Mbps only support full duplex modeDuplex Flow ControlResilience Features For more information about STP and RSTP, see UsingQuality of Service For more information about Quality of Service, see UsingEvent 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 Relevant multicast group Using Multicast FilteringUsing Multicast Filtering Query mode Snooping ModeQuery Mode That support IP Igmp v2 protocolIgmp multicast filtering works as follows Enabling Igmp Multicast LearningIgmp Multicast Filtering Using Multicast Filtering Spanning Tree Protocol STPNetwork 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 1 Redundancy for Backbone Link Configuration 2 Redundancy through Meshed BackboneConfiguration 3 Redundancy for Cabling Error STP configurations Using STP on a Default BehaviorNetwork with Multiple VLANsConfiguration that separates VLANs Using Resilience Features How Switch What is the SwitchDatabase? Database EntriesDatabases entries can have three states Switch Database Entry StatesPrioritization? What is TrafficAvailable Converged network applications Used by organizations with a802.1D Priority Levels How Traffic Prioritization Works Traffic Prioritization Your SwitchConfiguring traffic prioritization for QoS on a Switch How traffic is processed to provide Quality of ServiceUsing Traffic Prioritization What is RMON? Network efficiency and reduce the load on your networkThat allows you to monitor the traffic of LANs or VLANs Alarms EventsIt improves your efficiency Rmon SwitchLow 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 provide extra security VLANs ease the movement of devices on networksVLANs help to control traffic Creating an Ieee 802.1Q Tagged Link MembershipTwo Vlans connected via a router Using Untagged ConfigurationConfigure the VLANs ExamplesConfigure the VLANs on Switch Add endstation ports on Switch 1 to the VLANsAdd ports to the VLANs Add endstation ports on Switch 2 to the VLANs Add port 12 on Switch 1 to the VLANsAdd port 11 on Switch 2 to the VLANs Check the Vlan membership for both switchesConfiguration Obtains IP How Your SwitchInformation How Automatic IPHow Automatic IP Configuration Works Automatic IP configuration feature That a Switch may change its IP address whilst in useConsiderations IP Addressing Configuration RulesGlossary IndexPage Configuration Rules for Gigabit Ethernet Configuration RulesFast Ethernet configuration rules Configuration Rules for Fast Ethernet Appendix a Configuration Rules This chapter contains the following sections NetworkSimple Network Segments are connected to the Switch which is positionedFamily and 4900 family can be used in your network ExampleDual Speed Hub Switch Improving Advanced NetworkResilience of Your NetworkEnhancing PerformanceTherefore the overall network performance Simple Overview IP AddressesIP Address Obtaining a Registered IP AddressDotted Decimal Notation Decimal value of an octet whose bits are all 1s isNetwork Portion Subnet mask Extending the Network Prefix Subnet Mask NumberingOr leave the field blank Glossary Glossary Ethernet EndstationEthernet address Fast EthernetHalf duplex GatewayHub Ieee 802.1DLine speed See baud Glossary Rstp See Rapid Spanning Tree Protocol STP See Spanning Tree Protocol STP Page Glossary Numbers IndexIgmp multicast filtering 30 Internet Addresses 85 InterNIC Sub-networks. See subnets Switch Database

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