Auto Negotiation, Jumbo Frames Support | Dell 28XX specification

Auto Negotiation

Auto negotiation allows an Ethernet switch to advertise modes of operation. The auto negotiation function provides the means to exchange information between two Ethernet switches that share a point- to-point link segment, and to automatically configure both Ethernet switches to take maximum advantage of their transmission capabilities. Port advertisement allows the system administrator to configure the port speeds advertised.

Jumbo Frames Support

Jumbo frames are frames with an MTU (Maximum Transmission Unit) size of up to 10K bytes. The Jumbo Frames Support feature, utilizes the network optimally by transporting the same data using less frames.

The main benefits of this facility are reduced transmission overhead and reduced host processing overhead. Jumbo frames are used for server-to-server transfers.

AutoMDI/MDIX Support

The switch automatically detects whether the cable connected to an RJ-45 port is crossed or straight through.

Standard wiring for end stations is Media-Dependent Interface (MDI) and the standard wiring for hubs and switches is known as Media-Dependent Interface with Crossover (MDIX).

Auto MDI/MDIX works on 10/100/1000BASE-T Ethernet ports. This feature is automatically enabled for the entire system and cannot be turned off by the user.

Flow Control Support (IEEE802.3X)

On Full Duplex links (FDX), the flow control mechanism allows the receiving side to signal to the sending side that transmission must be halted temporarily, in order to prevent buffer overflows. Flow control is enabled by default.

Virtual Cable Testing (VCT)

VCT technology provides the mechanism to detect and report potential cabling issues, such as cable opens and cable shorts on copper links.

Cable analysis is available on Copper Cables (10BASE-T/100BASE-T/1000BASE-T), and is only done when the link is down. When the system initiates a cable-testing operation, upon explicit user action, the following parameters are detected:

•Cable Type and Status

•Cable Length

•Fault-Distance

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Dell PowerConnect 28xx Systems User Guide

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Dell 28XX manual Auto Negotiation, Jumbo Frames Support, AutoMDI/MDIX Support, Flow Control Support IEEE802.3X

Contents

User Guide March 4 Contents Installing the PowerConnect Device Using Dell OpenManage Switch Administrator Manually Allocating IP Addresses Static Hosts 144 169 PowerConnect System Description PowerConnect 2816 Front Panel Features Summary of PowerConnect ModelsGeneral Features Virtual Cable Testing VCT Auto NegotiationJumbo Frames Support AutoMDI/MDIX Support MAC Address Supported Features Layer 2 Features Vlan Supported Features Spanning Tree Protocol Features Class of Service CoS Features Ethernet Switch Management Features Switch Port Configurations PowerConnect 28xx Front and Back Panel Port Description PowerConnect 2808 Back Panel PowerConnect 2824 Front Panel PowerConnect 2824 Back Panel Physical Dimensions LED Definitions Power LED Managed Mode LEDFan LED 2824/2848 only Port LEDs Managed Mode Button Switch Ventilation FanSFP Port LED Cables, Port Connections, and Pinout Information 1000BASE-T Cable RequirementsRJ-45 Connections for 10/100/1000BASE-T Ports SFP Ports SFP Pin Connections Pin No Use Power Connectors Internal Power Supply Connector Installing the PowerConnect Device Installation Precautions Package Contents Site RequirementsUnpacking Unpacking the Device Device Rack Installation Mounting the DeviceOverview Installing on a Flat Surface Bracket Installation for Rack Mounting Installing on a Wall Bracket Installation for Wall Mounting Mounting Device on a Wall Connecting the Device Connecting the Device to the NetworkConnecting the Terminal to the Device Connecting a Device to a Power Supply Port Connections, Cables, and Pinout Information RJ-45 Connections for 10/100/1000BaseT Ports Ports, Connectors and Cables Port/Interface Port Default Settings Auto-NegotiationFlow Control Back Pressure Switching Port Default Settings Following table gives the port default settings 43+ Management Modes Enter Wizard Unmanaged Mode In this mode Transitioning Between Modes Transitioning Between Management Modes Restore Saved Configuration Booting the Device Managed Mode Initial Configuration Through the Set-up Wizard Welcome to Dell Easy Setup Wizard Wizard Step Wizard Step Initial Configuration Through the Web Basic Configuration Retrieving an IP Address From a Dhcp Server Web management IP Interface Parameters Startup Menu Erasing the Device Configuration Software DownloadErase Flash File Password Recovery Software Download Through Tftp ServerSystem Image Download Boot Image Download Using Dell OpenManage Switch Administrator Understanding the Interface Using the Switch Administrator Buttons Information Buttons Access Levels Starting the ApplicationDevice Management Buttons Dell PowerConnect 28xx Systems User Guide Defining General Device Information Viewing Device Information Defining System Information Asset Viewing the Versions Click Apply ChangesInitiating a Telnet Session Resetting the Device Resetting the Device Entering Secure Mode Entering Secure Mode Setting static IP Interface parameters Defining Device IP AddressesDefining IP Interface Parameters Running Cable Diagnostics Viewing Copper Cable DiagnosticsNo Cable Viewing Optical Transceiver Diagnostics Performing a Cable TestOpen the Integrated Cable Test Click Test Now Displaying Virtual Cable Test Results Table Open the Optical Transceiver Diagnostics Click Show All Optical Transceiver Diagnostics TXTransmitter Fault Transmitter fault LOSLoss of Signal Loss of signal Password 0-64 Characters User-defined password Assigning Access Rights to a UserManaging Device Security Defining the Local User Databases Defining a New User Displaying the Local User Table Configuring Radius Global Parameters Deleting Users Open the Radius Settings Defining Radius ParametersAdding a Radius Server Add Radius Server page opens Modifying the Radius Server Settings Displaying the Radius Server List Defining Snmp Parameters Deleting a Radius Server for the Radius Servers List Enabling Authentication Notifications Defining Snmp Global ParametersEnabling Snmp Notifications Defining Communities Defining a New CommunityOpen the Snmp Community Add Snmp Community page opens Displaying all Communities Deleting Communities Defining Snmp Notification Recipients 19. Notification Recipients Adding a new Trap Recipients Open Notification RecipientsAdd Notification Recipients page opens Displaying Notification Recipients Tables Managing Files Downloading Files Firmware Download 21. File Download From Server Configuration Download Uploading FilesDownloading Files Open the File Download From Server Restoring Default Settings Restoring Default SettingsUploading Files Open the File Upload to Server Defining Dhcp Server Settings Configuring Dhcp Properties→ Dhcp Server → Dhcp Server Properties in the tree view Enabling the Dhcp Server 24. Dhcp Server Properties Click Apply Changes. The server is enabled Defining Network Pool Excluding Addresses Adding an Excluded Address Open the Excluded AddressesDeleting Excluded Addresses Manually Allocating IP Addresses Static Hosts 28. Static Hosts Domain Name- Specifies Adding a new Static HostAdd Static Host page opens Displaying Static Hosts Tables Click Show All Static Hosts Table page opens Address Binding Deleting Static Hosts Defining Advanced Settings Configuring General Device Parameters Configuring Network Security Port Based AuthenticationAdvanced Port Based Authentication Configuring Port Based Authentication → Port Based Authentication Displaying the Port Based Authentication Table Copying Parameters in the Port Based Authentication Table Select an interface in the Port Based Authentication Table Configuring Advanced Port Based Authentication Multiple Hosts Displaying the Multiple Hosts Table Multiple Hosts Table Authenticating Users Displaying the Authenticated Users TableClick Show All Authenticated Users Table opens Authenticated Users Table 100 Configuring Ports Defining Port Parameters101 102 Displaying the Port Configuration Table Aggregating PortsDefining Port Parameters Modifying Port Parameters LAG Configuration 104 Open the LAG Configuration Current Flow ControlDefining LAG Parameters Modifying LAG Parameters Configuring Green Ethernet Displaying the LAG Configuration Table106 11. Green Ethernet Configuration 107 Open the Green Ethernet Configuration Enabling Storm ControlEnabling Green Ethernet on the Device 108 Enabling Storm Control on the Device Displaying the Storm Control TableClick Show All Storm Control Table opens 109 Defining Port Mirroring Sessions 110 Adding a Port Mirroring Session Open the Port MirroringAdd Source Port page opens 111 Configuring Address Tables Viewing Dynamic AddressesDeleting a Copy Port from a Port Mirroring Session 112 Redefining the Aging Time Open the Dynamic Address Table113 Configuring the Spanning Tree Protocol Defining STP Global SettingsQuerying the Dynamic Address Table Sorting the Dynamic Address Table 16. STP Global Settings 115 Open the STP Global Settings Select Enable in the Spanning Tree State fieldDefining STP Global Parameters Modifying STP Global Parameters Defining STP Port Settings 117 Ethernet Fast Ethernet Gigabit Ethernet 118 Click Apply Changes. STP is enabled on the port Enabling STP on a PortModifying STP Port Properties Displaying the STP Port Table Defining STP LAG Settings 120 121 Configuring Rapid Spanning Tree Open the STP LAG SettingsModifying the LAG STP Parameters 122 Enabling Rstp 123 Configuring VLANs Defining Vlan Members124 Adding New VLANs Open the Vlan MembershipCreate New Vlan page opens 125 Vlan Port Membership Table Modifying Vlan Membership GroupsDeleting Vlan Membership Groups 126 Assigning Ports to a Vlan Group Deleting a Vlan127 Defining Vlan Ports Settings Assigning Port SettingsOpen the Vlan Port Settings 128 Defining Vlan LAG Settings Displaying the Vlan Port Table129 Assigning Vlan LAG Settings Open the Vlan LAG SettingDisplaying the Vlan LAG Table 130 Aggregating Ports 131 Configuring a Port to a LAG Multicast Forwarding SupportDefining LAG Membership Open the LAG Membership Defining Multicast Global Parameters Enabling Bridge Multicast Filtering on the Device133 Adding Bridge Multicast Address Members Enabling Igmp Snooping on the Device134 Adding Bridge Multicast Addresses Open the Bridge Multicast GroupAdd Bridge Multicast Group page opens Define the Vlan ID and New Bridge Multicast Address fields Defining Ports to Receive Multicast Service Assigning LAGs to Receive Multicast ServiceAssigning Multicast Forward All Parameters 136 137 Port Control Definition Attaching a Port to a Multicast Router or Switch Attaching a LAG to a Multicast Router or SwitchOpen Bridge Multicast Forward All 138 Igmp Snooping 139 Displaying the Igmp Snooping Table 140 Viewing Rmon Statistics Viewing Rmon Statistics Group141 Viewing Charts Viewing the CPU UtilizationViewing Interface Statistics Open the Rmon Statistics Group 143 CPU Utilization VPT Tag Classification Information CoS Value Forwarding Queue Values144 CoS Services Dscp Value Forwarding Queue Values145 Defining CoS Settings Enabling Quality of ServiceDefining CoS Global Parameters Defining QoS Interface Settings Selecting Trust147 Defining Queue Settings Assigning QoS/CoS settings for an interfaceOpen the Interface Settings Displaying the QoS Interface Settings Table Defining the Queue Settings Open the QoS Queue Settings149 Mapping CoS Values to Queues Mapping a CoS value to a QueueOpen the CoS to Queue Mapping Table Restoring default values Mapping Dscp Values to QueuesMapping a Dscp value and assigning priority queue 151 Open the Dscp to Queue Check the Restore Defaults checkbox Accessing the Device Through the CLI Console ConnectionTelnet Connection 153 Using the CLI Command Mode OverviewUser Exec Mode 154 Privileged Exec Mode Global Configuration Mode155 Interface Configuration Mode Interface ModeVlan Mode Port Channel Mode CLI Commands Command copy Command debug-mode Command doCharacter Description Debug-mode Command end Command exit configuration Command exit Exec Command helpCommand interface ethernet 160 Command interface port-channel Command interface vlanInterface port-channel port-channel-number Interface vlan vlan-id Command ip address No ip address162 Command ping DefaultsUser Guidelines 163 164 Command show tech-support command Show tech-support config memoryShow clock show system show version 165 Command snmp-server community 166 Command username Default167 168 169 170 171 172 173 174 175 176 177 178 Index Page Page 182 183 184