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Configuring Bridging Services
4-2 117351-A Rev. A
Databases
To connect the TB and SR networks, the translation bridge uses two databases.
The following sections describe each database.
Forwarding Database
The translation bridge adds addresses to the forwarding table as it learns them
from the network. Therefore, the forwarding table size should be configured large
enough to hold the addresses it learns from both the TB and the SR network.
Both the transparent bridge and the translation bridge use the same forwarding
table to make decisions on where to send packets. The following sections discuss
how the translation bridge makes these decisions.
Route Information Field Database
The route information field database includes routing information for all known
stations on the network. The translation bridge uses this database to provide
source routing information for frames it forwards from the TB network to the SR
network.
When the translation bridge learns an address on the SR network, it adds the RIF
information to the RIF database and adds the address and port information to the
forwarding database. When the TB network forwards a frame to the SR network,
the forwarding database determines the correct port to be used to reach the
destination. The RIF database determines the correct RIF to insert in the frame so
it can successfully traverse the SR network.
Database Aging Mechanism
The information that the translation bridge inserts into the forwarding database
and the RIF database has an aging attribute that determines how long the
information remains in the databases. Each time the translation bridge receives a
frame from a particular SR station address, the age in both databases is reset.
When the aging attribute reaches a user-configurable value, the translation bridge
deletes the entries for that SR station from both the RIF database and the
forwarding database. This aging mechanism allows you to control how quickly
the translation bridge adapts to changes in the SR network topology.
- Configuring Bridging 1
- Services 1
- Contents 5
- 117351-A Rev. A 10
- About This Guide 17
- Conventions 18
- Acronyms 19
- Bay Networks Customer Service 21
- How to Get Help 21
- Chapter 1 23
- How the Bridge Works 24
- The Translation Process 25
- BRG0027A 26
- 117351-A Rev. A 1-5 27
- 1-6 117351-A Rev. A 28
- DA SA DSAP SSAP CTL DATA FCS 29
- BRG0004A 29
- Spanning Tree Algorithm 30
- 117351-A Rev. A 1-9 31
- 1-10 117351-A Rev. A 32
- 117351-A Rev. A 1-11 33
- 1-12 117351-A Rev. A 34
- BRG0008A 35
- 1-14 117351-A Rev. A 36
- Enabling Bridge Service 37
- 117351-A Rev. A 1-17 39
- Editing Bridge Parameters 40
- 117351-A Rev. A 1-19 41
- 117351-A Rev. A 1-23 45
- 1-26 117351-A Rev. A 48
- 1-28 117351-A Rev. A 50
- 117351-A Rev. A 1-29 51
- Flushing the Forwarding Table 54
- 2. Click on OK 55
- Chapter 2 57
- 2-2 117351-A Rev. A 58
- 117351-A Rev. A 2-3 59
- 2-4 117351-A Rev. A 60
- Figure 2-3. Route Discovery 60
- How IP Encapsulation Works 61
- 2-6 117351-A Rev. A 62
- 117351-A Rev. A 2-7 63
- IP Encapsulation Features 64
- 117351-A Rev. A 2-9 65
- 2-10 117351-A Rev. A 66
- BRG0016A 67
- 2-12 117351-A Rev. A 68
- 117351-A Rev. A 2-13 69
- 2-14 117351-A Rev. A 70
- 117351-A Rev. A 2-15 71
- 2-16 117351-A Rev. A 72
- BRG0020A 73
- 2-18 117351-A Rev. A 74
- 117351-A Rev. A 2-19 75
- IP Encapsulation Guidelines 76
- Source Routing over FDDI 77
- 117351-A Rev. A 2-23 79
- 2-24 117351-A Rev. A 80
- 117351-A Rev. A 2-25 81
- 2-26 117351-A Rev. A 82
- 117351-A Rev. A 2-27 83
- 2-28 117351-A Rev. A 84
- 117351-A Rev. A 2-29 85
- 117351-A Rev. A 2-31 87
- 2-32 117351-A Rev. A 88
- 117351-A Rev. A 2-33 89
- 2-36 117351-A Rev. A 92
- 2-38 117351-A Rev. A 94
- 117351-A Rev. A 2-39 95
- 117351-A Rev. A 2-41 97
- 2-42 117351-A Rev. A 98
- 117351-A Rev. A 2-43 99
- 100
- 117351-A Rev. A 2-45 101
- 117351-A Rev. A 2-47 103
- Configuring Bridging Services 104
- 2-48 117351-A Rev. A 104
- 117351-A Rev. A 2-49 105
- 117351-A Rev. A 2-51 107
- 108
- 108
- Guidelines 109
- 2-54 117351-A Rev. A 110
- 117351-A Rev. A 2-55 111
- 2-58 117351-A Rev. A 114
- 2. Select OK 114
- Chapter 3 115
- Using NetBIOS Services 115
- Registering Station Names 116
- Establishing Sessions 117
- Sessionless Communication 118
- Broadcast Reduction 118
- 3-6 117351-A Rev. A 120
- Cache Lookup 122
- Cache Aging 122
- Implementation Notes 123
- NetBIOS Caches 124
- Enabling NetBIOS Services 125
- Editing NetBIOS Parameters 125
- 3-12 117351-A Rev. A 126
- 117351-A Rev. A 3-13 127
- 3-16 117351-A Rev. A 130
- 117351-A Rev. A 3-23 137
- 3-28 117351-A Rev. A 142
- 3. Click on Delete 142
- Chapter 4 143
- Databases 144
- Bridge Operations 145
- 4-4 117351-A Rev. A 146
- TB to SR Challenges 147
- 4-6 117351-A Rev. A 148
- BRG0024A 150
- 117351-A Rev. A 4-9 151
- 4-10 117351-A Rev. A 152
- 117351-A Rev. A 4-11 153
- 4-12 117351-A Rev. A 154
- 117351-A Rev. A 4-13 155
- 4-14 117351-A Rev. A 156
- 117351-A Rev. A 4-15 157
- 4-16 117351-A Rev. A 158
- 4-18 117351-A Rev. A 160
- 161
- 162
- 117351-A Rev. A 4-21 163
- 117351-A Rev. A 4-23 165
- 4-24 117351-A Rev. A 166
- 117351-A Rev. A 4-25 167
- Chapter 5 169
- 5-2 117351-A Rev. A 170
- Defining a Closed User Group 171
- Enabling NML Services 173
- Editing NML Parameters 174
- 117351-A Rev. A 5-7 175
- 177
- 5-10 117351-A Rev. A 178
- 179
- 117351-A Rev. A 5-13 181
- 5-14 117351-A Rev. A 182
- Enabling Ranges 183
- Deleting NML from the Router 185
- Appendix A 187
- Site Manager Default Settings 187
- A-2 117351-A Rev. A 188
- A-4 117351-A Rev. A 190
- A-6 117351-A Rev. A 192
- A-8 117351-A Rev. A 194
- Appendix B 197
- Routing Control 198
- Table B-1. Frame Size Bits 199
- Routing Designators 200
- 117351-A Rev. A Index-1 201
- 117351-A Rev. A Index-3 203
- 117351-A Rev. A Index-5 205
- 117351-A Rev. A Index-7 207
- Index-8 117351-A Rev. A 208
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