Allied-telesis AT-GS950/16 User Manual Page 115
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AlliedWare Plus Version 2.1.2 Management Software Web Browser User’s Guide
115
Bridge Priority
and the Root
Bridge
The first task that bridges perform when a spanning tree protocol is
activated on a network is the selection of a root bridge. A root bridge
distributes network topology information to the other network bridges and
is used by the other bridges to determine if there are redundant paths in
the network.
A root bridge is selected by the bridge priority number, also referred to as
the bridge identifier, and sometimes the bridge’s MAC address. The bridge
with the lowest bridge priority number in the network is selected as the root
bridge. If two or more bridges have the same lowest bridge priority
number, the one with the lowest MAC address is designated as the root
bridge.
You can change the bridge priority number in the AT-S108 Version V1.1.0
Management software. You can designate which switch on your network
as the root bridge by giving it the lowest bridge priority number. You may
also consider which bridge should function as the backup root bridge in the
event you need to take the primary root bridge off line and assign that
bridge the second lowest bridge identifier number.
The bridge priority has a range 0 to 61440 in increments of 4096. To make
this easier for you, the AT-S108 Version V1.1.0 Management software
divides the range into increments. You specify the increment that
represents the desired bridge priority value. The range is divided into
sixteen increments, as shown in Table 1.
Table 1 Bridge Priority Value Increments
Increment
Bridge
Priority
Increment
Bridge
Priority
0x0000 0 0x8000 32768
0x1000 4096 0x9000 36864
0x2000 8192 0xA000 40960
0x3000 12288 0xB000 45056
0x4000 16384 0xC000 49152
0x5000 20480 0xD000 53248
0x6000 24576 0xE000 57344
0x7000 28672 0xF000 61440
- AT-GS950/16 1
- Contents 3
- List of Figures 9
- List of Tables 13
- Contacting Allied Telesis 17
- Chapter 1 19
- Switch’s IP Address 20
- Web Browser Tools 23
- Basic Switch Configuration 25
- IP Access List Configuration 28
- Delete an IP 30
- Address List 30
- System Time 31
- Setting Daylight 33
- Parameters 33
- DHCP Client Configuration 35
- DHCP Auto Configuration 37
- System Management Information 38
- Add New User 40
- Name and 40
- Password 40
- Modify User 41
- Delete User Name 42
- User Interface Configuration 43
- User Interface 44
- System Information Display 45
- Switch Reboot 47
- Configure 49
- Factory Default 49
- Disabling Factory 51
- Default Reset 51
- Enabling Factory 52
- Pinging a Remote System 54
- SSL Settings 56
- 4. Click Apply 57
- System Log Configuration 58
- Display and Configure Ports 63
- Chapter 3: Port Configuration 64
- Port Mirroring 69
- Port Mirroring Configuration 71
- Chapter 4: Port Mirroring 72
- Disable Port Mirroring 73
- Virtual LANs 75
- VLAN Overview 76
- Port-based 77
- Tagged VLAN 78
- VLAN Name 79
- Tagged and Untagged Ports 79
- Port VLAN Identifier (PVID 79
- Assign Ports to a VLAN Mode 81
- Chapter 5: Virtual LANs 82
- Tagged VLAN Configuration 83
- Modify a Tagged 84
- Name field 86
- Delete a Tagged 87
- Tagged VLAN Port Settings 89
- Port-Based VLAN Configuration 91
- Modify a Port 92
- Based VLAN 92
- Delete a Port 92
- Chapter 6 95
- Overview and Guidelines 96
- Time Settings 100
- Chapter 6: GVRP 102
- Voice VLAN 103
- Overview 104
- Dynamic Auto 105
- Detection vs 105
- Static Ports 105
- Chapter 7: Voice VLAN 106
- General Guidelines 107
- Configuration 108
- OUI Setting 111
- Modify OUI 112
- Delete OUI 112
- STP and RSTP 113
- Bridge Priority 115
- Path Costs and Port Costs 116
- Port Priority 116
- Forwarding 117
- Delay and 117
- Topology 117
- Point-to-Point and Edge Ports 118
- Mixed STP and 119
- RSTP Networks 119
- Spanning Tree 120
- Chapter 8: STP and RSTP 122
- Configure RSTP Port Settings 125
- Configure the 127
- Advanced RSTP 127
- Port Settings 127
- Spanning Tree Topology 130
- Chapter 9 131
- Head2 Head3 132
- VLAN Mapping 135
- Modify MST 136
- Instance 136
- Delete MST 136
- Port Configuration 137
- Topology Information 142
- Static Port Trunking 145
- Create a Port Trunk 149
- Modify a Port Trunk 151
- Disable a Port Trunk 153
- LACP Port Trunks 155
- System Priority 157
- Port Priority Value 157
- Chapter 11: LACP Port Trunks 158
- Group Status 161
- Port Priority Configuration 164
- Quality of Service (CoS) 165
- Egress Queue vs 167
- Packet Priority 167
- Prioritizing 168
- Untagged Packets 168
- Queue Scheduling Algorithm 175
- Access Control Configuration 177
- Classifier 178
- 1 - 65535 179
- Profile Action 183
- Modify Profile 184
- Delete Profile 185
- 4. Click on the OK button 186
- In-Profile Action 187
- Modify In-Profile 189
- Delete In-Profile 190
- Out-Profile Action 191
- Modify Out 193
- Delete Out 194
- Port List 195
- “Create Policy,” next 198
- “Modify Policy” on page 200 198
- “Delete Policy” on page 201 198
- Policy Sequence 203
- Storm Control 205
- Ingress Rate 207
- Limiting 207
- Egress Rate 207
- Ingress Rate Limiting 210
- Egress Rate Limiting 212
- MAC Address Table 213
- Chapter 15: MAC Address Table 216
- Modify Static Unicast Address 218
- Delete Static Unicast Address 219
- DHCP Snooping 225
- DHCP with 227
- Option 82 227
- General Configuration 229
- Chapter 16: DHCP Snooping 230
- VLAN Setting 231
- Modify VLAN 232
- Delete VLAN 232
- Binding Database 234
- IGMP Snooping 237
- IGMP Snooping Configuration 240
- Chapter 17: IGMP Snooping 242
- Security 243
- Port Access Control 244
- Port Access 245
- Chapter 18: Security 246
- RADIUS Client 249
- Radius Client 250
- Dial-in User 252
- Modify a Dial-in User 253
- Delete a Dial-in User 254
- Destination MAC Filter 255
- Destination MAC 256
- Chapter 19 257
- Global Configuration 259
- Information 260
- Neighbors Information 262
- SNMPv1 and v2c 263
- SNMPv1 and SNMPv2c Overview 264
- Attributes 265
- Activate SNMP Interface 266
- Create SNMP v1/ 267
- Group Names 267
- SNMPv1/v2 Community Strings 269
- SNMP Traps 271
- Modify Trap 272
- Host Table Entry 272
- Delete Trap Host 272
- Table Entry 272
- Chapter 21 273
- SNMPv3 Overview 274
- SNMPv3 Privacy 275
- Protocol 275
- SNMPv3 MIB 275
- SNMPv3 User and Group Names 278
- SNMPv3 View Names 280
- Modify SNMPv3 281
- View Names 281
- Delete SNMPv3 281
- View Table 283
- SNMPv3 Traps 285
- Chapter 22 287
- Enable and Disable RMON 289
- Port Statistics 290
- Histories 291
- Chapter 22: RMON 292
- Network Statistics 299
- Traffic Comparison Statistics 301
- Error Group Statistics 304
- Historical Status Charts 306
- Management Software Updates 309
- File Upload 316
- File Download 316
- Loopback Protection 321
- Cable Diagnostics 325
- Chapter 26: Cable Diagnostics 326
- MSTP Overview 327
- Resolving VLAN 330
- Fragmentation 330
- Multiple VLANS 331
- Assigned to an 331
- Appendix A: MSTP Overview 332
- VLAN and MSTI Associations 334
- Ports in Multiple MSTIs 335
- MST Region 338
- Guidelines 338
- Associating VLANs to MSTIs 341
- Summary of Guidelines 345
- Appendix A 347
- Parameter 354
- Default Setting 354
- Specifications 354
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