Congestion, Data link layer, Datagram | Cabletron Systems 100

Glossary

congestion

A condition where a portion of the network is overloaded with more data than can be transmitted in the desired time period.

CSMA/CD (carrier-sense multiple access with collision detection)

A channel access (contention) method that requires each station to wait for an idle channel before transmitting. In addition, stations are able to detect overlapping transmissions (collisions) and retransmit in the event of a data collision.

data link layer

Layer 2 in the OSI model. Deﬁnes frame construction, addressing, error detection, and other services to higher layers.

datagram

Abbreviated and connectionless single-packet message sent from one station to another.

data rate (or speed)

The maximum number of bits of information that can be transmitted per second.

downstream

Refers to the relative position of a station in a network to another station in the same network. A station is downstream from another station if it receives data after the other station receives data.

dynamic address

An address “learned” by the ELS100-16TX, as opposed to addresses that are manually entered into the Bridge Address Table. The ELS100-16TX “learns” addresses by reading them from the data packets it processes.

EIA (Electronic Industries Association)

Organization that sets standards for electrical interfaces (connectors).

B-3

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Cabletron Systems 100 manual Congestion, Data link layer, Datagram, Data rate or speed, Downstream, Dynamic address

Contents

User Guide Page FCC Notice DOC Notice Cabletron Software Program License Declaration of Conformity Contents Monitoring and Managing Your ELS100-16TX ELS100-16TX Diagnostics Troubleshooting Appendix B Glossary Appendix a Technical Specifications Contents Viii Chapter Introduction About this Manual Your email address Getting Help Document Conventions Related Documentation ELS100-16TX Front Panel Overview SmartSTACK 100 ELS100-16TX Architecture Introduction Autonegotiation Port Trunking Discarding Local Trafﬁc Store and Forward Switching Spanning Tree Algorithm Typical Switching Application SmartSTACK 100 ELS100-16TX Bridge Address Table SmartSTACK 100 ELS100-16TX Sample Applications SmartSTACK 100 ELS100-16TX Port Mirroring SmartSTACK 100 ELS100-16TX Trunking SmartSTACK 100 ELS100-16TX Trunking with 100 Mbps Ports Virtual Workgroups Repeater Traffic Workgroup a Workgroup B Local Console Manager Command Syntax Conventions Help Basic LCM Commands ELS100-16TX Local Console Manager Traplog EraseExit or Logout Introduction ELS100-16TX Front Panel Chapter Unpacking and Installing Your ELS100-16TX Port LEDs 100BASE-T Epim Ports Reset Switch Status LEDs ACT Describes the ELS100-16TX buttons Installing AN Epim Installing an Epim Rack-Mounting an ELS100-16TX Installing the ELS100-16TX Attaching Rackmount Brackets Connecting the Local Console Manager Checking the POWER-UP Diagnostics Sequence Connecting to the Network ELS100-16TX Twisted Pair Connection Connecting UTP Cables Cable Pinouts RJ45 Crossover Cable Connecting a Segment to the EPIM-100FX Fiber Optic Network Connection EPIM-100FX Port Unpacking and Installing Your ELS100-16TX Spectrum Spel Spma Chapter Configuring Your ELS100-16TX Assigning IP Addresses Type ipaddr PORT-NUMBER IP Address Changing a Subnet Mask Displaying IP AddressesDeleting an IP Address To change the subnet mask, at the LCM prompt Enabling Bridging Displaying Bridging Functions Disabling Bridging Enabling Trunking 100BASE-T Crossover Cables Trunk Groups Trunk Groups Disabling Trunking Display could look like the following Displaying Trunking Status Enabled, Rip listening Disabling Mirroring Enabling Port Mirroring Displaying Mirroring Status To check the status for ports conﬁgured for mirroring Deﬁning Virtual Workgroups Defining and Deleting Workgroups LCM responds with the following display Assigning a Community Name Configuring BROADCAST/MULTICAST Storm Protection System Contact Modifying MIB Variables Community Names System NameSystem Location Aging Parameter Set Community Name ELS100-16TX Statistics Chapter Monitoring and Managing Your ELS100-16TXELS100-16TX Management Tools System Statistics Gathering Statistics Ethernet Port Statistics Displaying Status Using LCM to Check ELS100-16TX Status Enabled, Rip listening Displaying MAC Addresses To display all MAC addresses, at the LCM prompt LCM would display Displaying Manufacturing Information Managing the ELS100-16TX Using LCM to Manage the ELS100-16TX Enabling a Port Disabling a Port NoRIP Option Changing a Community Name Setting the Baud Rate Setting a Reboot Time Power-up LED Sequence Chapter ELS100-16TX Diagnostics and TroubleshootingPOWER-UP Diagnostics Software Checksum Comparison Speciﬁc Power-up Tests Status and Activity Indicators Power-up Diagnostics ResultsResponses to Failures AT POWER-UP ELS100-16TX Front Panel LEDs ACT ELS100-16TX does not Power UP 3 ELS100-16TX Does Not Respond to NMS Connectivity Problems2 ELS100-16TX Has Rebooted ELS100-16TX Diagnostics and Troubleshooting Physical Connector PortsElectrical Environmental Standard Support Diagnostic LEDs Management Support Address Table SizeRegulatory Compliance Serial Cable PIN Assignments 100BASE-T PIN Assignments Connectors Crossover Wiring STRAIGHT-THROUGH Wiring 5 4 3 Rule EPIM-100FX Specifications Cable Type Worst Case Budget Typical Budget Technical Speciﬁcations Address AlarmAddress table Agent Bandwidth BackboneBpdu bridge protocol data unit Bps bits per second Data link layer CongestionDatagram Data rate or speed Encapsulation Full wire speedEncode Entity Icmp Internet control message protocol Intelligent bridge/switchIeee Initialization Interoperability InternetworkingIP Internet protocol ISO International Standards Organization Mask MAC media access controlMbps megabits per second MIB management information base Propagation delay Power budgetOSI Open Systems Interconnection Packet Service Rarp reverse address resolution protocolProtocol Protocol suite Symbol SwitchSynchronous transmission Translating bridge WAN wide area network Upstream Glossary