3Com 3 manual Low Threshold Statistic High Threshold Recovery

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RMON and the Switch 57

Table 6 Values for the default alarm(s)

		Low Threshold
Statistic	High Threshold	Recovery	Period

Number of errors	Value: 8 errors per 10
over 10 seconds	seconds
	Action: Smart
	auto-sensing will reduce
	port speed

Value: 8 errors per 10	10 secs
seconds
Action: None. (Speed can
only be increased upon
link loss, for example by
removing and replacing
the cable, or by triggering
the port to perform
another auto-negotiation
on that link.)

The Audit Log The Switch keeps an audit log of all management user sessions, providing a record of a variety of changes, including ones relating to RMON. The log can only be read by users at the security access level using an SNMP Network Management application.

Each entry in the log contains information in the following order:

■Entry number

■Timestamp

■User ID

■Item ID (including qualifier)

■New value of item

The last 16 operations are stored in the audit log. The oldest records are overwritten first.

Email Notification of Your Switch allows you to receive email notification when certain RMON Events events occur. You can receive notification via email, SMS (Short Message

Service), or pager, of the event that has occurred.

This feature uses an SMTP (Simple Mail Transfer Protocol) email client to send the notification email. The Short Message Service (SMS) and pager messages are constrained on message size so they are sent to a different email address which creates the message to be displayed and then forwards it on to the SMS or pager gateway.

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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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