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Configuring Bridging Services
1-12 114060 Rev. A
Figure 1-10. Root Port Determination (Equal Path Costs and Root Interface Priorities)
The spanning tree algorithm selects a bridge on each LAN as the designated
bridge. The root port of this bridge has the lowest-cost path to the root bridge.
All bridges turn off (set to blocking state) all of the lines except for the single
line that is the shortest-cost path to the root and any line attached to the LANs
for which the bridge serves as a designated bridge.
4. Elect a designated port.
The spanning tree algorithm selects the port that connects the designated
bridge to the LAN as the designated port. If there is more than one such port,
the spanning tree algorithm selects the port with the lowest priority as the
designated port. This port, which carries all extended network traffic to and
from the LAN, is in the forwarding state.
Thus, the spanning tree algorithm removes all redundant ports (ports providing
parallel connections) from service (places in the blocking state). If there is a
topological change or a bridge or data-path failure, the algorithm derives a new
spanning tree that may move some ports from the blocking to the forwarding
state.
For example, in Figure
1-8, if all path costs are equal and Bridge 2 has the
lowest-bridge priority (followed by Bridge 3, Bridge 4, and Bridge 1), the
spanning tree algorithm may block Bridge 1/Interface 8 and Bridge 4/Interface 9
from service.
LAN A
IF 3
IF 1
IF 1 = priority 1
IF 2 = priority 1
IF 4
LAN B
IF 2
IF 3 = priority 3
IF 4 = priority 2
Path costs from IF 3 to root bridge and
from IF 4 to root bridge are equal.
---------AND--------
IF 4 becomes root port because it has
a better priority than IF3.
Root
Bridge
Bridge A
Given:
Then:
Same
priority
BRG0007A
- Configuring Bridging 1
- Services 1
- Bay Networks Software License 3
- (continued) 4
- Contents 5
- 114060 Rev. A 10
- About This Guide 17
- Conventions 18
- Acronyms 19
- World Wide Web 23
- Customer Service FTP 23
- Support Source CD 24
- CompuServe 24
- InfoFACTS 25
- How to Get Help 25
- Chapter 1 27
- How the Bridge Works 28
- The Translation Process 29
- 1-4 114060 Rev. A 30
- 114060 Rev. A 1-5 31
- 1-6 114060 Rev. A 32
- DA SA DSAP SSAP CTL DATA FCS 33
- BRG0004A 33
- Spanning Tree Algorithm 34
- 114060 Rev. A 1-9 35
- 1-10 114060 Rev. A 36
- 114060 Rev. A 1-11 37
- 1-12 114060 Rev. A 38
- 4. Elect a designated port 38
- BRG0008A 39
- Filtering Frames 40
- Enabling Bridge Service 41
- 1-16 114060 Rev. A 42
- 114060 Rev. A 1-17 43
- Editing Bridge Parameters 44
- 114060 Rev. A 1-19 45
- 114060 Rev. A 1-21 47
- 114060 Rev. A 1-23 49
- 1-26 114060 Rev. A 52
- 114060 Rev. A 1-27 53
- BRG0010A 53
- 1-28 114060 Rev. A 54
- 114060 Rev. A 1-29 55
- Flushing the Forwarding Table 58
- 2. Click on OK 59
- Chapter 2 61
- 2-2 114060 Rev. A 62
- 114060 Rev. A 2-3 63
- 2-4 114060 Rev. A 64
- Figure 2-3. Route Discovery 64
- How IP Encapsulation Works 65
- 2-6 114060 Rev. A 66
- 114060 Rev. A 2-7 67
- IP Encapsulation Features 68
- 114060 Rev. A 2-9 69
- 2-10 114060 Rev. A 70
- BRG0016A 71
- 114060 Rev. A 2-13 73
- 2-14 114060 Rev. A 74
- 114060 Rev. A 2-15 75
- 2-16 114060 Rev. A 76
- BRG0020A 77
- 2-18 114060 Rev. A 78
- 114060 Rev. A 2-19 79
- Source Routing over FDDI 81
- 114060 Rev. A 2-23 83
- 2-24 114060 Rev. A 84
- 114060 Rev. A 2-25 85
- 2-26 114060 Rev. A 86
- 114060 Rev. A 2-27 87
- 2-28 114060 Rev. A 88
- 114060 Rev. A 2-29 89
- Refer to “ 91
- 2-32 114060 Rev. A 92
- 114060 Rev. A 2-33 93
- 2-34 114060 Rev. A 94
- 2-36 114060 Rev. A 96
- 2-38 114060 Rev. A 98
- 114060 Rev. A 2-39 99
- 100
- 114060 Rev. A 2-41 101
- Configuring Bridging Services 102
- 2-42 114060 Rev. A 102
- 114060 Rev. A 2-43 103
- 104
- 114060 Rev. A 2-45 105
- 114060 Rev. A 2-47 107
- 114060 Rev. A 2-49 109
- 111
- 2-52 114060 Rev. A 112
- 114060 Rev. A 2-53 113
- 2-54 114060 Rev. A 114
- 114060 Rev. A 2-55 115
- 2-58 114060 Rev. A 118
- 2. Select OK 118
- Chapter 3 119
- Using NetBIOS Services 119
- Registering Station Names 120
- Establishing Sessions 121
- Sessionless Communication 122
- Broadcast Reduction 122
- 3-6 114060 Rev. A 124
- Cache Lookup 126
- Cache Aging 126
- Implementation Notes 127
- NetBIOS Caches 128
- Enabling NetBIOS Services 129
- Editing NetBIOS Parameters 129
- 3-12 114060 Rev. A 130
- 114060 Rev. A 3-13 131
- 3-16 114060 Rev. A 134
- 114060 Rev. A 3-23 141
- 3-28 114060 Rev. A 146
- 3. Click on Delete 146
- 3-30 114060 Rev. A 148
- Chapter 4 149
- Databases 150
- Bridge Operations 151
- 4-4 114060 Rev. A 152
- TB to SR Challenges 153
- 4-6 114060 Rev. A 154
- Loop-Free Operation 156
- 114060 Rev. A 4-9 157
- 4-10 114060 Rev. A 158
- 114060 Rev. A 4-11 159
- 4-12 114060 Rev. A 160
- 114060 Rev. A 4-13 161
- 4-14 114060 Rev. A 162
- 114060 Rev. A 4-15 163
- 4-16 114060 Rev. A 164
- 4-18 114060 Rev. A 166
- 167
- 168
- 114060 Rev. A 4-21 169
- 114060 Rev. A 4-23 171
- 4-24 114060 Rev. A 172
- 114060 Rev. A 4-25 173
- Chapter 5 175
- 5-2 114060 Rev. A 176
- 5-4 114060 Rev. A 178
- Enabling NML Services 179
- Editing NML Parameters 180
- 114060 Rev. A 5-7 181
- 5-8 114060 Rev. A 182
- 183
- 5-10 114060 Rev. A 184
- 185
- 114060 Rev. A 5-13 187
- Enabling Ranges 188
- 114060 Rev. A 5-15 189
- Deleting NML from the Router 190
- Appendix A 191
- Site Manager Default Settings 191
- A-2 114060 Rev. A 192
- A-4 114060 Rev. A 194
- A-6 114060 Rev. A 196
- Appendix B 199
- Routing Control 200
- Table B-1. Frame Size Bits 201
- Routing Designators 202
- 114060 Rev. A Index-1 203
- 114060 Rev. A Index-3 205
- 114060 Rev. A Index-5 207
- 114060 Rev. A Index-7 209
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