What is STP? | 3Com 3 manual

What is STP? 35

Figure 5 A network configuration that creates loops

Figure 6 shows the result of enabling STP on the bridges in the configuration. STP detects the duplicate paths and prevents, or blocks, one of them from forwarding traffic, so this configuration will work satisfactorily. STP has determined that traffic from LAN segment 2 to LAN segment 1 can only flow through Bridges C and A, because, for example, this path has a greater bandwidth and is therefore more efficient.

Figure 6 Traffic flowing through Bridges C and A

If a link failure is detected, as shown in Figure 7, the STP process reconfigures the network so that traffic from LAN segment 2 flows through Bridge B.

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3Com 3 manual What is STP?

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 Conventions Pddtechpubscomments@3com.com RelatedDocumentation Comments Registration Product Switch Features Page Software? What isSwitch Features Management Switch Features Overview Flow Control Ports operating at 1000 Mbps only support full duplex modeFor more information about multicast filtering, see Using Duplex Resilience Features For more information about STP and RSTP, see Using Event Notification Quality of ServiceFor more information about Quality of Service, see Using 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 Filtering Using Multicast Filtering Query Mode Query modeSnooping Mode Enabling Igmp Multicast Learning Igmp v2 protocolThat support IP Igmp multicast filtering works as follows Igmp Multicast Filtering Using Multicast Filtering Network Spanning TreeProtocol STP 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 3 Redundancy for Cabling Error Configuration 1 Redundancy for Backbone LinkConfiguration 2 Redundancy through Meshed Backbone STP configurations Multiple VLANs Default BehaviorUsing STP on a Network with Configuration that separates VLANs Using Resilience Features Database Entries What is the SwitchHow Switch Database? Databases entries can have three states Switch Database Entry States Converged network applications Used by organizations with a What is TrafficPrioritization? Available 802.1D Priority Levels How Traffic Prioritization Works Traffic Prioritization Your Switch Configuring traffic prioritization for QoS on a Switch How traffic is processed to provide Quality of Service Using Traffic Prioritization That allows you to monitor the traffic of LANs or VLANs What is RMON?Network efficiency and reduce the load on your network It improves your efficiency AlarmsEvents Rmon Switch Low 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 networks VLANs help to control traffic Creating an Ieee 802.1Q Tagged Link Membership Two Vlans connected via a router Examples ConfigurationUsing Untagged Configure the VLANs Add ports to the VLANs Configure the VLANs on SwitchAdd endstation ports on Switch 1 to the VLANs Check the Vlan membership for both switches Add port 12 on Switch 1 to the VLANsAdd endstation ports on Switch 2 to the VLANs Add port 11 on Switch 2 to the VLANs Configuration How Automatic IP How Your SwitchObtains IP Information How Automatic IP Configuration Works Considerations Automatic IP configuration featureThat a Switch may change its IP address whilst in use Index Configuration RulesIP Addressing GlossaryPage Configuration Rules for Gigabit Ethernet Configuration Rules Fast Ethernet configuration rules Configuration Rules for Fast Ethernet Appendix a Configuration Rules This chapter contains the following sections Network Example Segments are connected to the Switch which is positionedSimple Network Family and 4900 family can be used in your network Dual Speed Hub Switch Network Advanced NetworkImproving Resilience of Your Therefore the overall network performance EnhancingPerformance Simple Overview IP Addresses IP Address Obtaining a Registered IP Address Network Portion Dotted Decimal NotationDecimal value of an octet whose bits are all 1s is Subnet mask Extending the Network Prefix Subnet Mask Numbering Or leave the field blank Glossary Glossary Fast Ethernet EndstationEthernet Ethernet address Ieee 802.1D GatewayHalf duplex Hub Line speed See baud Glossary Rstp See Rapid Spanning Tree Protocol STP See Spanning Tree Protocol STP Page Glossary Numbers Index Igmp multicast filtering 30 Internet Addresses 85 InterNIC Sub-networks. See subnets Switch Database