3Com 3 manual Port Features

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2	OPTIMIZING BANDWIDTH

There are many ways you can optimize the bandwidth on your network and improve network performance. If you utilize certain Switch features you can provide the following benefits to your network and end users:

	■	Increased bandwidth
	■	Quicker connections
	■ Faster transfer of data
	■	Minimized data errors
	■	Reduced network downtime
	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.

Port Features	The default state for all the features detailed below provides the best
	configuration for a typical user. In normal operation, you do not need to
	alter the Switch from its default state. However, under certain conditions
	you may wish to alter the default state of these ports, for example, if you
	want to force a port to operate at 10 Mbps.

Duplex Full duplex allows packets to be transmitted and received simultaneously and, in effect, doubles the potential throughput of a link. Half duplex only allows packets to be transmitted or received at any one time.

To communicate effectively, both devices at either end of a link must use the same duplex mode. If the devices at either end of a link support auto-negotiation, this is done automatically.

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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 ConventionsPddtechpubscomments@3com.com RelatedDocumentation CommentsRegistration ProductSwitch Features Page Software? What isSwitch Features ManagementSwitch Features Overview Flow Control Ports operating at 1000 Mbps only support full duplex modeFor more information about multicast filtering, see Using DuplexResilience Features For more information about STP and RSTP, see UsingFor 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 Relevant multicast group Using Multicast FilteringUsing Multicast Filtering Snooping Mode Query modeQuery Mode Enabling Igmp Multicast Learning Igmp v2 protocolThat support IP Igmp multicast filtering works as followsIgmp 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 Multiple VLANs Default BehaviorUsing STP on a Network withConfiguration that separates VLANs Using Resilience Features Database Entries What is the SwitchHow Switch Database?Databases entries can have three states Switch Database Entry StatesConverged network applications Used by organizations with a What is TrafficPrioritization? Available802.1D 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 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 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 Examples ConfigurationUsing Untagged Configure the VLANsAdd endstation ports on Switch 1 to the VLANs Configure the VLANs on SwitchAdd ports 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 VLANsConfiguration How Automatic IP How Your SwitchObtains IP InformationHow Automatic IP Configuration Works That a Switch may change its IP address whilst in use Automatic IP configuration featureConsiderations Index Configuration RulesIP Addressing GlossaryPage 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 NetworkExample Segments are connected to the Switch which is positionedSimple Network Family and 4900 family can be used in your networkDual Speed Hub Switch Network Advanced NetworkImproving Resilience of YourPerformance EnhancingTherefore the overall network performance Simple Overview IP AddressesIP Address Obtaining a Registered IP AddressDecimal value of an octet whose bits are all 1s is Dotted Decimal NotationNetwork Portion Subnet mask Extending the Network Prefix Subnet Mask NumberingOr leave the field blank Glossary Glossary Fast Ethernet EndstationEthernet Ethernet addressIeee 802.1D GatewayHalf duplex HubLine 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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