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Dimension ES-4024 Ethernet Switch
MAC Table 30-1
Chapter 30
MAC
Table
This chapter introduces the MAC Table screen.
30.1 Introduction to MAC Table
The MAC Table screen (a MAC table is also known as a filtering database) shows how frames are forwarded or
filtered across the switch’s ports. It shows what device MAC address, belonging to what VLAN group (if any) is
forwarded to which port(s) and whether the MAC address is dynamic (learned by the switch) or static (manually
entered in the Static MAC Forwarding screen).
The switch uses the MAC table to determine how to forward frames. See the following figure.
1. The switch examines a received frame and learns the port on which this source MAC address came.
2. The switch checks to see if the frame's destination MAC address matches a source MAC address already
learned in the MAC table.
If the switch has already learned the port for this MAC address, then it forwards the frame to that port.
If the switch has not already learned the port for this MAC address, then the frame is flooded to all ports.
Too much port flooding leads to network congestion.
If the switch has already learned the port for this MAC address, but the destination port is the same as the
port it came in on, then it filters the frame.
Figure 30-1 MAC Table Flowchart
Is destination
MAC address in
the MAC table?
Forward to all ports
except the incoming one.
Is outgoing port
different from
Filter this frame. Forward to outgoing port.
No Yes
No Yes
- Dimension 1
- ES-4024 1
- Copyright 3
- ZyXEL Limited Warranty 4
- FCC Interference Statement 5
- FCC Warning 5
- CE Mark Warning: 5
- Certifications 5
- Customer Support 6
- Table of Contents 7
- Table of Contents ix 9
- Table of Contents xi 11
- List of Figures 12
- Lists of Figures xiii 13
- Lists of Figures xv 15
- List of Tables 17
- List of Tables xix 19
- Preface 20
- The ES Switch Server 21
- Computer Printer Gateway 21
- ZyXEL Web Site 21
- Features And Applications 23
- Chapter 1 25
- to Know the ES-4024 25
- 1.1.2 Firmware Features 26
- 1.2 Applications 27
- 1.2.1 Backbone Application 28
- 1.2.2 Bridging Example 28
- VLAN Shared Server Example 30
- Part II 31
- Chapter 2 33
- Hardware 33
- Installation 33
- Chapter 3 35
- Connections 35
- Default Ethernet Settings 36
- Auto-crossover 36
- 3.5 Front Panel LEDs 37
- 3-4 Hardware Connections 38
- 3.7 Uplink Scenario Example 40
- 3.8 Accessing the ES-4024 41
- Getting Started 43
- Introducing 45
- the Web Configurator 45
- Chapter 4 45
- 4.4 Switch Lockout 50
- 4.5 Resetting the Switch 51
- 4.5.2 Help 52
- Status and Port Statistics 53
- Chapter 5 53
- 5.2.1 Port Details 54
- Port Info 55
- Setting 59
- Chapter 6 59
- 6-2 Basic Setting 60
- 6.3 General Setup 61
- 6.4 Introduction to VLANs 62
- 6.5 IGMP Snooping 63
- 6.6 Switch Setup Screen 63
- 6.7 IP Setup 65
- DESCRIPTION 66
- 6.8 Port Setup 68
- Advanced Application 71
- Chapter 7 73
- GARP Timers 74
- 7.1.3 Port VLAN Trunking 75
- 7.1.4 Select VLAN Type 75
- 7.1.6 Configuring a VLAN 78
- 7-10 VLAN 82
- Chapter 8 85
- MAC Forward Setup 85
- Chapter 9 87
- Filtering 87
- Filtering 9-3 89
- Table 9-1 Filtering 89
- Filtering 9-5 91
- Chapter 10 93
- Spanning 93
- Tree Protocol 93
- 10.2 STP Status 94
- 10.2.1 Configuring STP 95
- Spanning Tree Protocol 10-5 97
- Chapter 11 99
- Bandwidth 99
- Bandwidth Control 11-3 101
- Chapter 12 105
- Broadcast 105
- Storm Control 105
- LABEL DESCRIPTION 106
- Chapter 13 109
- Mirroring 109
- Mirroring 13-3 111
- Mirroring 13-5 113
- Mirroring 13-7 115
- Chapter 14 117
- Aggregation 117
- 14.1.2 Link Aggregation ID 118
- Chapter 15 121
- Authentication 121
- 15-2 Port Authentication 122
- Chapter 16 125
- Security 125
- Port Security 16-3 127
- Table 16-1 Port Security 127
- Chapter 17 129
- Chapter 18 133
- Control 133
- 18.3 About SNMP 134
- 18.3.1 Supported MIBs 135
- 18.3.2 SNMP Traps 135
- 18.3.3 Configuring SNMP 135
- 18.5 Remote Management 138
- DSCP Unused 141
- 19.2 Activating DiffServ 142
- Chapter 20 149
- 20-2 Queuing Method 150
- Figure 20-1 Queuing Method 150
- Chapter 21 153
- 21.2 Viewing VRRP Status 154
- 21.3 Configuring VRRP 155
- Advertisement Interval 157
- Priority 157
- Preempt Mode 157
- Router A has higher 160
- Switch A is the 161
- Select 2 for VR2 162
- Routing Protocol 165
- Chapter 22 167
- Chapter 23 169
- 23-2 RIP 170
- Table 23-1 RIP 170
- Chapter 24 171
- 24-2 IGMP 172
- Table 24-1 IGMP 172
- Chapter 25 173
- 25.3 Configuring DVMRP 174
- Chapter 26 177
- 26.1.2 How OSPF Works 178
- 26.1.4 Configuring OSPF 178
- 26.2 OSPF Status 179
- 26-4 OSPF 180
- Table 26-2 OSPF Status 180
- 26.6.1 Viewing Virtual Links 187
- Management 189
- Chapter 27 191
- Maintenance 191
- Step 1. Click Backup 192
- 27.5 Load Factory Defaults 193
- 27.6 Reboot System 193
- Example FTP Commands 194
- 27.7.3 GUI-based FTP Clients 195
- 27-6 Maintenance 196
- Chapter 28 197
- Diagnostic 197
- Chapter 29 199
- Management 199
- Cluster Manager 201
- Cluster Member 201
- 29-6 Cluster Management 204
- Chapter 30 205
- Table 205
- 30.2 Viewing the MAC Table 206
- Chapter 31 207
- Tab l e 207
- 31.2 Viewing the IP Table 208
- Chapter 32 209
- Chapter 33 211
- Chapter 34 213
- Server Status 213
- DHCP Server Status 34-3 215
- Commands 217
- Chapter 35 219
- Introduction 219
- to CLI 219
- 35.2 Command Summary 220
- 35.2.2 sys sw Commands 225
- 35-8 Introduction to CLI 226
- Introduction to CLI 35-9 227
- status 227
- 35-10 Introduction to CLI 228
- Introduction to CLI 35-11 229
- 35-12 Introduction to CLI 230
- Introduction to CLI 35-13 231
- 35.2.3 EXIT Command 232
- 35.2.4 ip Commands 233
- 35-16 Introduction to CLI 234
- Introduction to CLI 35-17 235
- 35-18 Introduction to CLI 236
- Introduction to CLI 35-19 237
- 35.2.5 config Command 238
- Chapter 36 239
- Examples 239
- 36.2.3 sys version 240
- 36.2.4 sys monitor status 240
- 36.2.6 sys ixe2424 pktcnt 241
- 36.3 ipCommands 242
- 36.3.2 ip route status 243
- 36.3.4 ip rtDomain add 243
- 36.3.5 ip rtDomain delete 244
- 36.3.6 ip arp status 244
- Chapter 37 245
- 802.1Q Tagged VLAN 245
- 37.4.1 sys sw garp status 247
- 37.4.2 sys sw garp timer 247
- 37.4.3 sys sw gvrp status 248
- 37.4.4 sys sw gvrp enable 248
- 37.4.5 sys sw gvrp disable 248
- Forwarding Process Example 251
- Untagged Frames 252
- Appendix and Index 255
- Appendix A 257
- Product Specifications 257
- B Product Specifications 258
- Product Specifications C 259
- D Product Specifications 260
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