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Configuring Bridging Services
1-10 114060 Rev. A
Next, Endstation K receives two copies of the frame, resulting in an inefficient use
of the available bandwidth. More serious, however, is the effect of duplicate
frames on the two bridges. The frame flooded by Bridge 1 onto Interface 1 is
ultimately read by Bridge 2 on Interface 2. When Bridge 2 reads this frame, it
updates its forwarding table to indicate that Endstation J is in the direction of
LAN B. Similarly, Bridge 1 reads the frame flooded by Bridge 2 and updates its
forwarding table to show that Endstation J is in the direction of LAN B.
Consequently, the forwarding tables of both bridges are now corrupted and neither
bridge can properly forward a frame to Endstation J.
You can avoid this problem by implementing the spanning tree algorithm, which
produces a logical tree topology out of any arrangement of bridges. The result is
that a single path exists between any two endstations on an extended network. The
spanning tree algorithm also provides a high degree of fault tolerance. It allows
the network to automatically reconfigure the spanning tree topology if there is a
bridge or data-path failure.
The spanning tree algorithm requires five values to derive the spanning tree
topology. The first, a multicast address specifying all bridges on the extended
network, is media-dependent and is automatically determined by the software.
You assign the remaining four values, which are
• Network-unique identifier for each bridge on the extended network
• Unique identifier for each bridge/LAN interface (called a port)
• Priority specifying the relative priority of each port
• Cost for each port
After you assign these values, bridges multicast and process the formatted frames
(called Bridge Protocol Data Units, or BPDUs) to derive a single loop-free
topology throughout the extended network. The bridges exchange BPDU frames
quickly, minimizing the time that service is unavailable between hosts.
- 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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