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AT-GS950/48 Web Interface User Guide
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VLANs Across Different Regions
Special consideration needs to be taken into account when you connect
different MSTP regions or an MSTP region and a single-instance STP or
RSTP region. Unless planned properly, VLAN fragmentation can occur
between the VLANS of your network.
As mentioned previously, only the CIST can span regions. An MSTI cannot.
Consequently, you may run into a problem if you use more than one physical
data link to connect together various parts of VLANs that reside in bridges in
different regions. The result can be a physical loop, which spanning tree
disables by blocking ports.
This is illustrated in Figure 159. The example shows two switches, each
residing in a different region. Port 7 in switch A is a boundary port. It is an
untagged member of the Accounting VLAN, which has been associated with
MSTI 4. Port 6 is a tagged and untagged member of two different VLANs, both
associated to MSTI 12.
If both switches were a part of the same region, there would be no problem
because the ports reside in different spanning tree instances. However, in this
example, the switches are part of different regions, and MSTIs do not cross
regions. Consequently, the result is that spanning tree would determine that a
loop exists between the regions, Switch B would block a port and the
Accounting VLAN would be disabled between the two regions.
Figure 159. Spanning Regions - Example 1
There are several ways to address this issue. One is to configure only one
MSTP region for each subnet in your network. This will eliminate the potential
situation of a loop and blocked port(s) between multiple regions.
Another approach is to configure multiple regions in a subnet and group the
VLANs that need to span two or more regions into the same MSTI. If other
VLANs also exist that do not span multiple regions, they can be assigned to
other MSTIs within their respective region.
- AT-GS950/48 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
- 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
- Point-to-Point Ports 77
- Workstation 77
- Edge Port 77
- 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
- Create a Tagged 167
- Modify a Tagged 168
- Chapter 13: Virtual LANs 170
- Delete a Tagged 171
- Tagged VLAN Port Settings 172
- Port-Based VLAN Configuration 174
- Modify a Port 175
- Based VLAN 175
- Delete a Port 176
- View Dynamic Forwarding Table 178
- Private VLAN Configuration 180
- Create a Private 181
- Modify a Private 182
- Delete a Private 182
- View Current VLAN Database 184
- Port-Based VLAN table: 185
- VLAN Index - VLAN ID numbers 185
- VLAN Name - VLAN names 185
- Chapter 14 187
- Overview and Guidelines 188
- General Configuration 189
- Port Settings 190
- Time Settings 192
- Chapter 14: GVRP 194
- Chapter 15 195
- Egress Queue vs 197
- Packet Priority 197
- Prioritizing 198
- Untagged Packets 198
- Queue Scheduling Algorithm 205
- IPv6 Traffic Class Mapping 206
- Create IPv6 207
- Traffic Class 207
- Delete an IPv6 208
- Advanced Features 209
- SNMPv1 and v2c 211
- SNMPv1 and SNMPv2c Overview 212
- Trap Receiver Attributes 213
- Activate SNMP Interface 214
- Create User and 215
- Group Names 215
- Chapter 16: SNMPv1 and v2c 216
- Modify User and 217
- Delete User and 217
- SNMP Community Strings 218
- SNMP Traps 221
- Modify a Trap 222
- Host Table Entry 222
- Delete a Trap 223
- Chapter 17 225
- Protocol 227
- SNMPv3 MIB 227
- SNMPv3 Privacy 227
- SNMPv3 User and Group Names 230
- Modifying 231
- SNMPv3 User 231
- Deleting SNMPv3 232
- User and Group 232
- SNMPv3 View Names 233
- Chapter 17: SNMPv3 234
- SNMPv3 View 235
- View Names 235
- SNMPv3 View Table 236
- SNMPv3 Traps 239
- SNMP Engine ID 240
- Access Control Configuration 243
- Policy Settings 245
- Change a Policy 249
- View Specific 252
- Classifier Details 252
- Rate Control Settings 253
- Modify the 254
- Committed Rate 254
- Delete a Rate 255
- Control Entry 255
- Policy Database 256
- Display Specific 257
- Information 257
- Chapter 19 259
- Enable and Disable RMON 261
- Port Statistics 262
- Histories 264
- Chapter 19: RMON 266
- Voice VLAN 273
- Dynamic Auto 275
- Detection vs 275
- Static Ports 275
- Chapter 20: Voice VLAN 276
- OUI Setting 281
- Modify OUI 282
- Delete OUI 282
- Security 283
- Port Access Control 284
- Port Access 285
- Chapter 21: Security 286
- RADIUS Client 290
- Accounting 292
- Guidelines 293
- Dial-In User 296
- Dial-in User 296
- Modify a Dial-in User 298
- Delete a Dial-in User 298
- Destination MAC Filter 299
- Destination MAC 300
- DHCP Snooping 303
- DHCP with 305
- Option 82 305
- Configuring 308
- General Settings 308
- VLAN Setting 310
- Modifying a 311
- Chapter 22: DHCP Snooping 312
- Binding Database 314
- Chapter 23 317
- Global Configuration 319
- Enabling or 320
- Disabling LLDP 320
- Displaying 321
- Setting Port 321
- Chapter 23: LLDP 322
- Neighbors Information 323
- Network Statistics 325
- Traffic Comparison Statistics 327
- Error Group Statistics 331
- Historical Status Statistics 333
- Section IV 337
- Chapter 25 339
- File Download 346
- File Upload 347
- Cable Diagnostics 351
- Chapter 26: Cable Diagnostics 352
- LED ECO Mode 353
- Enable LED ECO Mode 354
- Disable LED ECO Mode 355
- Chapter 27: LED ECO Mode 356
- Energy-Efficient Ethernet 357
- Enable EEE 358
- Disable EEE 359
- Rebooting the AT-GS950/48 361
- Switch Reboot 362
- Disabling Factory 366
- Default Reset 366
- Enabling Factory 368
- Pinging a Remote System 371
- MSTP Overview 373
- Resolving VLAN 376
- Fragmentation 376
- Multiple VLANs 377
- Assigned to an 377
- Appendix A: MSTP Overview 378
- VLAN and MSTI Associations 380
- Ports in Multiple MSTIs 381
- MST Region 384
- Associating VLANs to MSTIs 387
- Summary of Guidelines 391
- Appendix B 393
- Bridge/Spanning Tree/MSTP 397
- Parameter 397
- Default Setting 397
- Specifications 397
- Bridge/VLAN 400
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