Ethernet Packet Header, 101 | D-Link DES-3326S instruction

DES-3326S Layer 3 Fast Ethernet Switch User’s Guide

There is no relationship between the MAC address of a network node and its IP address. There must be a database of Ethernet addresses and their corresponding IP addresses.

Different protocol families can be in use on the same network. The type code field allows each protocol family to have its own entry.

A checksum is calculated and when the packet is received, the checksum is recalculated. If the two checksums are different, the packet is dropped.

Figure 5-12. Ethernet Packet Header

When a packet is received, the headers are removed. The Ethernet Network Interface Card (NIC) removes the Ethernet header and checks the checksum. It then looks at the type code. If the type code is for IP, the packet is given to IP. IP then removes the IP header and looks at its protocol field. If the protocol field is TCP, the packet is sent to TCP. TCP then looks at the sequence number and uses this number and other data from the headers to reassemble the data into the original file.

Switch Management and Operating Concepts

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D-Link DES-3326S manual Ethernet Packet Header, 101

Contents

DES-3326S Wichtige Sicherheitshinweise Page Hardware Warranties Exclusive Software Page Copyright Statement Link Offices for Registration and Warranty ServiceTrademarks CE Mark Warning FCC WarningVcci Warning Bsmi Warning Viii Table of Contents Snmp Using WEB-BASED Management Xii Introduction Layer 3 Switching Introduction Functions of a Layer 3 Switch Performance Features FeaturesLayer 2 Features Ports DES-3326S Layer 3 Fast Ethernet Switch User’s Guide Layer 3 Switch Features Management Traffic Classification and Prioritization Supports Web-based management Fast Ethernet Technology Switch Stacking Gigabit Ethernet Technology Unpacking Unpacking and Setup Desktop or Shelf Installation Installation Installing rubber feet for desktop installation Rack Installation 2B. Installing the switch on an equipment rack Power on Power Failure Front Panel Identifying External Components Rear Panel Rear panel view of the Switch Optional Plug-in Modules Side Panels 1000BASE-T Module 100BASE-FX Fiber Module 2Km/15Km 62.5 ∝m 1000BASE-SX Fiber Module BASE-LX two-port module 1000BASE-LX Fiber Module Stacking Module with Gbic Port Gbic Two-Port Module Stacking Port Gbic Port 11. Up to 6 Switches in a Switch Stack Stacking Module LED Indicators Switch LED Indicators 13. Stacking Module LED Indicators Switch to End Node Connecting Switch Switch connected to an End Node Switch to Hub or Switch Switch Stack Connections 10BASE-T Device Switch Stack connections between optional stacking Modules 100BASE-TX Device Local Console Management Switch Management Operating Concepts Diagnostic console port RS-232 DCE Managing Switch Stacks Switch Stack Order − First Determining the Switch Stack Order 2original Master 001122334450 Console Boot Screen Switch IP Address Traps Setting an IP Address Switch Management and Operating Concepts Snmp performs the following functions Snmp Traps Authentication DES-3326S Layer 3 Fast Ethernet Switch User’s Guide Link Change Event This trap is sent MIBs Packet Forwarding MAC Address Aging Time Filtering Some filtering is done automatically by the switch Spanning Tree Parameter Description Default Value Variable Description Default Value Bridge Protocol Data Units Creating a Stable STP Topology Port transitions from one state to another as follows STP Port States STP Port State Transitions User-Changeable STA Parameters Feature Default Value DES-3326S Layer 3 Fast Ethernet Switch User’s Guide Illustration of STP Before Applying the STA Rules After Applying the STA Rules Link Aggregation Link Aggregation Group VLANs Defaultvlan Some relevant terms Ieee 802.1Q VLANs802.1Q Vlan Packet Forwarding Ieee 802.1Q Packet Forwarding 802.1Q Vlan Tags Ieee 802.1Q Tag Adding an Ieee 802.1Q Tag Port Vlan ID Switch Management and Operating Concepts Ingress Filtering Tagging and Untagging VLANs in Layer 2 Only Mode Definitions Layer 3-Based VLANsIP Addressing and Subnetting IP Addresses 255 Binary to Decimal Conversion Address Classes Subnet Masking Calculating the Number of Subnets and Nodes Classless InterDomain Routing Cidr Class a Subnet Masks 10. Class B Subnet Masks Setting up IP Interfaces 12. Vlan Example Assigned Ports Internet Protocols OSI Seven Layer Network Model Protocol Layering Protocol Stack Layer Layer TCP/IP DES-3326S Layer 3 Fast Ethernet Switch User’s Guide TCP Packet Headers 10. TCP Packet Header Switch Management and Operating Concepts 100 Ethernet 101 12. Ethernet Packet Header 102 TCP and UDP Well-Known Ports 103 UDP and Icmp 104 13. Ethernet Packet Header Domain Name System Domain Name ResolutionMapping Domain Names to Addresses 105 106 Dhcp Servers 107 IP Routing 108 Packet Fragmentation and Reassembly 109 ARP 110 MulticastingMulticast Groups 111 Address Assignment 112 Internet Group Management Protocol Igmp 113 Igmp Versions 1 114 14. Igmp Type Codes 115 Multicast Routing Algorithms 116 FloodingMulticast Spanning Trees 117 Reverse Path Broadcasting RPB 118 Reverse Path Multicasting RPM 119 Multicast Routing ProtocolsDistance Vector Multicast Routing Protocol Dvmrp Routing Protocols Protocol-Independent Multicast Dense ModeRouting Information Protocol RIP 120 121 122 RIP Version 1 Message Format 123 17. RIP v.1 Message Format 124 RIP 1 Message RIP Version 2 Extensions RIP 1 Route InterpretationRIP2 Message Format 125 126 Open Shortest Path First Ospf 127 Link-State Algorithm 128 Shortest Path Algorithm 129 Ospf CostShortest Path Tree 130 19. Constructing a Shortest Path Tree 131 20. Constructing a Shortest Path Tree 132 Areas and Border Routers 133 Link-State Packets 134 Simple Password Authentication Ospf AuthenticationMessage Digest Authentication MD-5 Backbone and Area Areas Not Physically Connected to Area Virtual LinksPartitioning the Backbone 136 137 Neighbors Designated Router Election AdjacenciesBuilding Adjacency 138 139 140 Adjacencies on Point-to-Point InterfacesOspf Packet Formats 141 Ospf Packet HeaderField Description 142 143 Hello Packet 144 Hello Packet 145 BDR 146 Database Description Packet 147 18. Database Description Packet 148 Link-State Request Packet 149 Link-State Update Packet 150 Link-State Acknowledgment Packet 151 Link-State Advertisement Formats 152 Link State Advertisement Header 153 Link-State Advertisement Header 154 155 Router Links Advertisements 156 Routers Links Advertisements 157 FieldDescription 158 159 160 Network Links Advertisements 161 Network Link Advertisements 162 Summary Link Advertisements 163 31. Summary Link Advertisement 164 Autonomous Systems External Link Advertisements 165 AS External Link Advertisements 166 167 Introduction 168 Before You StartGeneral Deployment Strategy 169 Vlan Layout 170 Assigning IP Network Addresses and Subnet Masks to VLANs Getting Started That opens, click on the Login to DES-3326S Manager buttonManagement Defining Static Routes 172 Configuring the SwitchUser Accounts Management 173 User Accounts Control Table 174 Admin and User Privileges 175 Configuration Mana Gement Admin UserSaving Changes 176 Save Changes Screen 177 Factory Reset 178 Setting Up Web Management 179 Ipaddress xxx.xxx.xxx.xxx/yyy.yyy.yyy.yyy 180 Saving Configuration Changes 181 Starting and Stopping the Web-based Manager 182 Web-based Manager’s User Interface 183 Areas of the User Interface 184 Area Function Basic Setup Setting Up The SwitchSwitch Information Click the Switch Information link in the Configuration menu 186 10. Switch Information Basic Settings 187 IP Address Configuring the Switch’s IP AddressTo set the switch’s IP address 188 11. Basic Switch Setup Switch will send out a Bootp New Switch IP Settings options areBroadcast request when it is powered Up. The Bootp protocol allows IP 190 Manual Vlan Name Default GatewayManagement Station IP Addresses 191 192 Snmp SettingsTo setup the switch for remote management 193 Configuring Community Strings 194 Setting Up Trap Receivers 195 Stacking Information 196 15. Switch Stack Display 197 17. Stacking Information 198 Show stacking mode/version 199 19. Console CLI show stack Command 200 201 Config stacking mode slaveConfig stacking mode master 202 Configure Ports 203 22. Port Configurations − Edit 204 Locking a Port’s MAC Address LearningSpeed/Duplex Toggle the Speed/Duplex Auto field 205 Serial Port Settings 206 Baud RateData Bits 207 Stop BitsAuto-Logout Configuring VLANs Advanced SetupTo create a new 802.1Q Vlan 208 209 To create a new 802.1Q VLAN, click the New button 210 26 .1Q Static VLANs Entry Settings Edit Tagged/Untagged PortUntagged Egress 212 213 Ingress Filter 214 To enable or disable GVRP, globally, on the switch 215 Layer 3 IP Networking 216 To setup IP Interfaces on the switch 217 To setup an new IP interface, click the New buttonTo edit an existing IP interface, click on the Edit button 218 Interface NameIP Address Switch Setup the Routing Information Protocol RIPSubnet Mask Active Yes 220 32. RIP Status 221 TX Mode DisabledRX Mode 222 MD5 Key Table Configuration 223 Key IDKey 224 Setup Ospf Current Route ID AS Border Router Ospf Area SettingState 225 Stub Default Cost Default Cost Stub ImportArea ID Type 227 Ospf Interface ConfigurationRemove 228 Router PriorityHello Interval 229 Auth TypeSimple Key Configuration Ospf Interface Configuration − MonitorAuth Key Metric 231 Virtual Interface Configuration 232 Neighbor RouterStatus 233 Area Aggregation Configuration 234 Route Redistribution Settings Destination Source ProtocolProtocol Metric Type 236 237 IP Multicasting To configure Igmp Snooping Igmp Snooping SettingsState Disabled 238 Query Igmp Interface ConfigurationMax Response Robustness Var 240 46. Igmp Interface Setup 241 VersionQuery Interval Max Response Dvmrp Interface ConfigurationTime Robustness 243 49. Dvmrp Interface Configuration − Edit Name System InterfaceProbe Interval 244 Neighbor Timeout Interval PIM-DM SettingsState Disabled Metric 246 50. PIM-DM Interface Configuration 247 51. PIM-DM Interface Configuration − Edit Join/Prune Static Router Port SettingsInterval 248 249 To setup a static router port 250 53. Static Router Port Settings − Add 251 To configure a port for port mirroringPort Mirroring 252 Source PortDirection Ingress 253 To configure a forwarding priority for a given MAC addressPriority 254 56. MAC Address Priority − Add User Priority MAC AddressSource/Destinatio 255 256 IP Address Filtering 257 0.0 258 259 Forwarding 260 Unicast MAC Address Forwarding 261 63. Unicast MAC Address Settings − Add 262 Multicast MAC Address ForwardingUnit 263 65. Multicast MAC Address Settings 264 None 265 IP Forwarding 266 To add a new static/default route, click the New buttonGateway IP 267 Static ARPTo add a new static ARP entry, click the New button 268 STP Switch Settings 269 72. STP Switch Settings 270 271 STP Port Settings 272 73. STP Port Settings 273 CostPriority 274 275 74. Link Aggregation 276 Following fields can be set Utilities Update Firmware from ServerTftp Utilities Port Member 278 77. Download Firmware from Server 279 Use Configuration File on Server 280 Save Settings To ServerSave History Log to Server 281 Utilities BOOTP/DHCP Relay Relay Status Bootp Hops Count LimitRelay Time Threshold 282 283 To add a new entry, click the New button 284 To configure DNS Relay, click on the DNS Relay linkDNS Relay 285 Address The IP address of the domain name To add a new entry to the table, click on the New button0.0 Above 287 Network MonitoringPort Utilization 288 87. Port Utilization window 289 Port Error StatisticsUpdate 290 88. Port Error Packet Statistics window CRC Error Update IntervalRX Frames Undersize TX Frames Drop PacketsExcessive Deferral Late Collision 293 Port Packet Analysis Frames/sec FramesUnicast RX Frames/sec Multicast RX Total/sec TX Bytes MAC Address TableTotal/sec TX Frames Total/sec 296 IP Address Table 297 298 91. IP Address Table Routing Table 300 Netmask 301 To view the switch’s ARP table, click on the ARP Table linkARP Table 302 93. ARP Table 303 Ospf Link State Database TableArea ID Displays the Ospf Area ID 304 Sequence 305 Ospf Neighbor TablePriorityrouter Ospf Virtual Neighbor Table 307 Dvmrp Neighbor Address Table Learned Gvrp StatusName Expire 309 Router PortsIgmp Snooping Status 310 100. Igmp Snooping Table 311 IP Multicast Forwarding Table 312 Igmp Group TableProtocol Routing protocol in use 313 Dvmrp Routing TableQuerier IP To view the switch history log Switch HistoryClick the Switch History link on the Applications menu 314 315 104. Switch History 316 Technical Specifications 317 Physical and Environmental EMI 318 319 Understanding Troubleshooting Spanning Tree Protocol Port in the blocking state does the following Blocking State 321 Port in the listening state does the following Listening State 323 Port in the learning state does the following Learning State 325 Port in the forwarding state does the following Forwarding State 327 Disabled port does the following Disabled State 329 Spanning Tree Protocol Failure Troubleshooting STP 331 Full/Half Duplex Mismatch Unidirectional Link 333 Packet Corruption Resource Errors Identifying a Data Loop Know where the root is locatedAvoiding Trouble Know which links are redundant Minimize the number of ports in the blocking state 337 Understanding and Troubleshooting the Spanning Tree Protocol 339 Impact of Layer 3 Switching Understanding and Troubleshooting the Spanning Tree Protocol 341 Brief Review Bitwise Logical Operations Not Index Spanning Tree Protocol Vlan Offices Registration Card