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 December Contents Port Connections, Cables, and Pinout Information Retrieving an IP Address From a Dhcp Server Using Dell OpenManage Switch Administrator Using the Switch Administrator Buttons Configuring the Spanning Tree Protocol 116 103114 126 133134 144 158 161 PowerConnect IntroductionSystem 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 DescriptionHardware 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 Port Default Settings Connector Port/Interface Cable Cables, Port Connections, and Pinout Information1000BASE-T Cable Requirements RJ-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 Connecting the Device Connecting the Device to the Network Connecting the Terminal to the Device Connecting a Device to a Power Supply Connecting to Console Port Ports, Connectors and Cables Port/Interface Port Connections, Cables, and Pinout InformationRJ-45 Connections for 10/100/1000BaseT Ports Port Default Settings Auto-NegotiationFlow Control Back Pressure Switching Port Default Settings Port Default Settings Function Dell PowerConnect 28xx Systems User Guide Starting and Configuring the Device Booting the Device Managed Mode Installation and Configuration Flow Initial Configuration Managed Mode Welcome to Dell Easy Setup Wizard Wizard Step Wizard Step Advanced Configuration Finally, setup the default gateway Startup Procedures Startup Menu ProceduresRetrieving an IP Address From a Dhcp Server Software Download Erase Flash File Erasing the Device Configuration Password RecoverySoftware Download Through Tftp Server System Image Download Boot Image Download Default Values Management Modes Transitioning Between Modes Transitioning Between Management Modes Returning to Managed Mode Restore Saved Configuration Dell PowerConnect 28xx Systems User Guide Using Dell OpenManage Switch Administrator Understanding the Interface Device Representation Interface Components Name Using the Switch Administrator Buttons Led Indicators Component NameInformation Buttons Information Buttons Description Access Levels Starting the ApplicationDevice Management Buttons Device Management Buttons Description Dell PowerConnect 28xx Systems User Guide Dell PowerConnect 28xx Systems User Guide Configuring System Information Defining General Device InformationViewing Device Information Asset Viewing the Versions Defining System InformationClick Apply Changes Initiating a Telnet Session Resetting the Device Resetting the Device Entering Secure Mode Entering Secure Mode Defining Device IP Addresses Defining IP Interface Parameters Running Cable Diagnostics Viewing Copper Cable DiagnosticsOpen the IP Interface Parameters Set Dhcp to Enable Setting static IP Interface parameters Performing a Cable Test Integrated Cable Test for Copper Cables Viewing Optical Transceiver Diagnostics Displaying Virtual Cable Test Results Table Open the Optical Transceiver Diagnostics Click Show All 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 TableDeleting Users Configuring Radius Global Parameters Click Show All Local User Table opens Select a User Name Open the Radius Settings Defining Radius ParametersAdding a Radius Server Modifying the Radius Server Settings Add Radius Server page opensDisplaying the Radius Server List Defining Snmp Parameters Click Show All Radius Servers List page opensDeleting 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 FilesClick Show All Notification Recipients Tables page opens Configuration Download Firmware Download Uploading Files Downloading FilesOpen the File Download From Server Defining Dhcp Server Settings Restoring Default SettingsRestoring Default Settings Uploading Files Configuring Dhcp Properties → Dhcp Server → Dhcp Server Properties in the tree view Click Apply Changes. The server is enabled Defining Network PoolEnabling the Dhcp Server 25. Network Pool Excluding Addresses Adding an Excluded Address Open the Excluded AddressesDeleting Excluded Addresses Manually Allocating IP Addresses Static Hosts 28. Static Hosts Adding a new Static Host Add Static Host page opens Displaying Static Hosts Tables Click Show All Static Hosts Table page opens Configuring Address Binding Deleting Static Hosts Defining Advanced Settings Configuring General Device Parameters Update with your book title Configuring Device Switching Configuring Network SecurityPort Based Authentication Advanced Port Based Authentication Configuring Port Based Authentication → Port Based Authentication Update with your book title 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 100 Displaying the Multiple Hosts Table 101 Authenticating Users Displaying the Authenticated Users TableClick Show All Authenticated Users Table opens 102 Configuring Ports Defining Port Parameters103 104 Displaying the Port Configuration Table Aggregating PortsDefining Port Parameters Modifying Port Parameters LAG Configuration 106 Displaying the LAG Configuration Table Defining LAG ParametersModifying LAG Parameters 107 Configuring Green Ethernet LAG Configuration Table opens108 11. Green Ethernet Configuration 109 Open the Green Ethernet Configuration Enabling Storm ControlEnabling Green Ethernet on the Device 110 Enabling Storm Control on the Device Displaying the Storm Control TableClick Show All Storm Control Table opens 111 Defining Port Mirroring Sessions 112 Adding a Port Mirroring Session Open the Port MirroringAdd Source Port page opens 113 Configuring Address Tables Viewing Dynamic AddressesDeleting a Copy Port from a Port Mirroring Session 114 Redefining the Aging Time Open the Dynamic Address Table115 Configuring the Spanning Tree Protocol Defining STP Global SettingsQuerying the Dynamic Address Table Sorting the Dynamic Address Table 16. STP Global Settings 117 Open the STP Global Settings Select Enable in the Spanning Tree State fieldDefining STP Global Parameters Modifying STP Global Parameters Defining STP Port Settings 119 Ethernet Fast Ethernet Gigabit Ethernet 120 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 122 123 Configuring Rapid Spanning Tree Open the STP LAG SettingsModifying the LAG STP Parameters 124 125 19. Rapid Spanning Tree Rstp Configuring VLANs Defining Vlan MembersEnabling Rstp 126 Adding New VLANs Open the Vlan MembershipCreate New Vlan page opens 127 Vlan Port Membership Table Modifying Vlan Membership GroupsDeleting Vlan Membership Groups 128 Assigning Ports to a Vlan Group Deleting a Vlan129 Defining Vlan Ports Settings Assigning Port SettingsOpen the Vlan Port Settings 130 Defining Vlan LAG Settings Displaying the Vlan Port Table131 Assigning Vlan LAG Settings Open the Vlan LAG SettingDisplaying the Vlan LAG Table 132 Aggregating Ports 133 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 Device135 Adding Bridge Multicast Address Members Enabling Igmp Snooping on the Device136 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 138 139 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 140 Igmp Snooping 141 Displaying the Igmp Snooping Table 142 Viewing Statistics 143 Viewing Rmon Statistics Viewing Rmon Statistics Group144 Viewing Charts Viewing Interface StatisticsOpen the Rmon Statistics Group 145 Viewing the CPU Utilization 146 Configuring Quality of Service CoS to Queue Mapping Table Default valuesVPT Tag Classification Information CoS Value Forwarding Queue Values CoS Services Dscp to Queue Mapping Table Default ValuesDscp Value Forwarding Queue Values 148 Enabling Quality of Service Defining CoS Global ParametersSelecting Trust 149 Defining QoS Interface Settings Assigning QoS/CoS settings for an interfaceOpen the Interface Settings Displaying the QoS Interface Settings Table Defining Queue Settings Click Show All QoS Interface Settings Table page opens151 Defining the Queue Settings Open the QoS Queue Settings152 Mapping CoS Values to Queues Mapping a CoS value to a QueueOpen the CoS to Queue Mapping Table 153 Restoring default values 154 Mapping Dscp Values to QueuesMapping a Dscp value and assigning priority queue 155 156 Managing the Device Using the CLI Accessing the Device Through the CLIConsole Connection Telnet Connection Using the CLI Command Mode OverviewUser Exec Mode 158 Privileged Exec Mode Global Configuration Mode159 Interface Configuration Mode Interface ModeVlan Mode Port Channel Mode CLI Commands Command asset-tagCommand copy Command debug-mode Command ModeUsage Guidelines Character Description Command do Command endCommand exit configuration Command exit Exec Command helpExamples Help Command interface ethernet Command interface port-channelInterface ethernet interface Interface port-channel port-channel-number Command interface vlan Command ip addressInterface vlan vlan-id Ip address ip-address Command ip default-gateway Command loginCommand ping Defaults 168 Command reload Command show tech-support commandReload 169 Show tech-support config memory 170 Command snmp-server community Default171 Command username 172 Glossary 173 174 175 Flapping Flow ControlFragment Host 177 178 179 180 181 182 Index 183 184 185 186