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Chapter 13: Virtual LANs
162
does not match one of the Group IDs assigned to the port, the packet is
discarded.
Port VLAN Identifier (PVID)
When an untagged packet is received on a port in a tagged VLAN, it is
assigned to one of the VLANs of which that port is a member. The
deciding factor in this process is the Port VLAN Identifier (PVID). Both
tagged and untagged ports in a tagged VLAN must have a PVID assigned
to them. The default value of the PVID for each port is 1. The switch
associates a received untagged packet to the VLAN ID that matches the
PVID assigned to the port, and the packet is only forwarded to those ports
that are members.
General Rules for Creating a Tagged VLAN
Here is a summary of the rules to observe when you create a tagged
VLAN:
Assign a unique name to each tagged VLAN.
Each tagged VLAN must be assigned a unique VLAN
ID. If a particular VLAN spans multiple switches, each
part of the VLAN on the different switches must be
assigned the same VLAN ID.
A tagged port can be a member of multiple VLANs.
The AT-GS950/16 Gigabit Ethernet Switch can support
up to 255 tagged VLANs per switch.
Private VLAN
Overview
Private VLANs create special broadcast domains in which the traffic of the
member ports is restricted to source ports. Ports in a private port VLAN
are only allowed to forward traffic to, and receive traffic from, a designated
source port, and are prohibited from forwarding traffic to each other.
An example application of a private port VLAN would be a library in which
user booths each have a computer with Internet access. In this situation, it
would usually be undesirable to allow communication between these
individual PCs. Connecting the computers to ports within a private isolated
VLAN would enable each computer to access the Internet or a library
server via a single connection, while preventing access between the
computers in the booths.
Another application for private port VLANs is to simplify IP address
assignments. Ports can be isolated from each other while still belonging to
the same subnet.
A private port VLAN consists of one or more forwarding ports and a source
port.
- AT-GS950/16 1
- Contents 10
- List of Figures 11
- List of Tables 15
- Document Conventions 18
- Getting Started 21
- Chapter 1 23
- Switch’s IP Address 24
- Switch Info 25
- Front Panel 25
- Web Browser Tools 27
- System Configuration 29
- System Management Information 30
- IPv6 System Configuration 34
- IPv6 Neighbor Configuration 36
- Neighbor Entry 37
- Find an IPv6 37
- Neighbor 37
- IP Access List Configuration 40
- Delete an IP 41
- Address List 41
- Add New User 42
- Name and 42
- Password 42
- Modify User 43
- Delete User Name 44
- User Interface Configuration 45
- User Interface 46
- System Time 47
- Setting Daylight 49
- Parameters 49
- SSL Settings 50
- DHCP Client Configuration 53
- Activate or 54
- Deactivate DCHP 54
- DHCP Auto Configuration 56
- System Information Display 57
- Hardware Information Section: 58
- IPv6 Information Section: 58
- System Log Configuration 60
- Bridge Configuration 63
- Port Configuration 65
- Chapter 3: Port Configuration 68
- STP and RSTP 71
- Bridge Priority 73
- Path Costs and Port Costs 74
- Port Priority 74
- Forwarding 75
- Delay and 75
- Topology 75
- Point-to-Point and Edge Ports 76
- Mixed STP and 78
- RSTP Networks 78
- Spanning Tree 78
- Chapter 4: STP and RSTP 80
- STP and RSTP Global Settings 81
- STP and RSTP Port Settings 84
- Chapter 5 87
- MSTP Global Settings 88
- Generic MSTP Port Settings 91
- MST Settings 94
- MST Port Settings 96
- Instance Information 98
- Static Port Trunking 99
- Overview 100
- General Guidelines 101
- Create a Port Trunk 103
- Modify a Port Trunk 105
- Disable a Port Trunk 107
- LACP Port Trunks 109
- System Priority 111
- Port Priority Value 112
- Chapter 7: LACP Port Trunks 114
- Group Status 115
- Configuration 116
- Port Priority Configuration 118
- Port Mirroring 119
- Port Mirroring Configuration 121
- Chapter 8: Port Mirroring 122
- Disable Port Mirroring 123
- Loopback Protection 125
- MAC Address Table 129
- Chapter 10: MAC Address Table 132
- Modify Static Unicast Address 134
- Delete Static Unicast Address 135
- IGMP Snooping 141
- IGMP Snooping Configuration 144
- Chapter 11: IGMP Snooping 146
- Storm Control 149
- Ingress Rate 151
- Limiting 151
- Egress Rate 151
- Ingress Rate Limiting 154
- Egress Rate Limiting 156
- Virtual LANs 157
- VLAN Overview 158
- Port-based 159
- Tagged VLAN 160
- VLAN Index 161
- VLAN Name 161
- Tagged and Untagged Ports 161
- Private VLAN 162
- Forwarding Ports 163
- Source Port 163
- Assign Ports to a VLAN Mode 164
- Tagged VLAN Configuration 166
- Modify a Tagged 168
- Delete a Tagged 170
- Tagged VLAN Port Settings 171
- Chapter 13: Virtual LANs 172
- Port-Based VLAN Configuration 173
- Modify a Port 174
- Based VLAN 174
- Delete a Port 175
- View Dynamic Forwarding Table 177
- Private VLAN Configuration 179
- Create a Private 180
- Modify a Private 181
- Delete a Private 181
- View Current VLAN Database 182
- Port-Based VLAN table: 183
- VLAN Index - VLAN ID numbers 183
- VLAN Name - VLAN names 183
- Chapter 14 185
- Overview and Guidelines 186
- General Configuration 187
- Port Settings 188
- Time Settings 190
- Chapter 14: GVRP 192
- Chapter 15 193
- Egress Queue vs 195
- Packet Priority 195
- Prioritizing 196
- Untagged Packets 196
- Queue Scheduling Algorithm 203
- IPv6 Traffic Class Mapping 204
- Create IPv6 205
- Traffic Class 205
- Delete an IPv6 206
- Advanced Features 207
- SNMPv1 and v2c 209
- SNMPv1 and SNMPv2c Overview 210
- Trap Receiver Attributes 211
- Activate SNMP Interface 212
- Create User and 213
- Group Names 213
- Chapter 16: SNMPv1 and v2c 214
- Modify User and 215
- Delete User and 215
- SNMP Community Strings 216
- SNMP Traps 219
- Modify a Trap 220
- Host Table Entry 220
- Delete a Trap 221
- Chapter 17 223
- SNMPv3 MIB 225
- SNMPv3 Privacy 225
- Protocol 225
- SNMPv3 User and Group Names 228
- Modifying 229
- SNMPv3 User 229
- Deleting SNMPv3 230
- User and Group 230
- SNMPv3 View Names 231
- Chapter 17: SNMPv3 232
- SNMPv3 View 233
- View Names 233
- SNMPv3 View Table 234
- SNMPv3 Traps 237
- SNMP Engine ID 238
- Access Control Configuration 241
- Policy Settings 243
- Change a Policy 247
- View Specific 249
- Classifier Details 249
- Rate Control Settings 251
- Modify the 252
- Committed Rate 252
- Delete a Rate 253
- Control Entry 253
- Policy Database 254
- Display Specific 255
- Information 255
- Chapter 19 257
- Enable and Disable RMON 259
- Port Statistics 260
- Histories 262
- Chapter 19: RMON 264
- Voice VLAN 269
- Dynamic Auto 271
- Detection vs 271
- Static Ports 271
- Chapter 20: Voice VLAN 272
- OUI Setting 277
- Modify OUI 278
- Delete OUI 278
- Security 279
- Port Access Control 280
- Port Access 281
- Chapter 21: Security 282
- RADIUS Client 286
- Accounting 288
- Guidelines 289
- Dial-In User 292
- Dial-in User 292
- Modify a Dial-in User 294
- Delete a Dial-in User 294
- Destination MAC Filter 295
- Destination MAC 296
- DHCP Snooping 299
- DHCP with 301
- Option 82 301
- Configuring 304
- General Settings 304
- VLAN Setting 306
- Modifying a 307
- Chapter 22: DHCP Snooping 308
- Binding Database 310
- Chapter 23 313
- Global Configuration 315
- Enabling or 316
- Disabling LLDP 316
- Displaying 317
- Setting Port 317
- Neighbors Information 318
- Network Statistics 319
- Traffic Comparison Statistics 321
- Error Group Statistics 325
- Historical Status Statistics 327
- Section IV 331
- Chapter 25 333
- File Download 340
- File Upload 341
- Cable Diagnostics 345
- Chapter 26: Cable Diagnostics 346
- LED ECO Mode 347
- Enable LED ECO Mode 348
- Disable LED ECO Mode 349
- Chapter 27: LED ECO Mode 350
- Energy-Efficient Ethernet 351
- Enable EEE 352
- Disable EEE 353
- Rebooting the AT-GS950/16 355
- Switch Reboot 356
- Disabling Factory 360
- Default Reset 360
- Enabling Factory 362
- Pinging a Remote System 365
- MSTP Overview 367
- Resolving VLAN 370
- Fragmentation 370
- Multiple VLANs 371
- Assigned to an 371
- Appendix A: MSTP Overview 372
- VLAN and MSTI Associations 374
- Ports in Multiple MSTIs 375
- MST Region 378
- Associating VLANs to MSTIs 381
- Summary of Guidelines 385
- Appendix B 387
- Bridge/Spanning Tree/MSTP 391
- Parameter 391
- Default Setting 391
- Specifications 391
- Bridge/VLAN 394
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