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Configuring Bridging Services
4-6 114060 Rev. A
Frame Format Selection
The Ethernet Version 2 and Ethernet 802.3 protocols transmit data using different
formats for frames. For example, in Ethernet Version 2, the first section of the
frame (the preamble) requires eight octets. For Ethernet 802.3 frames, the
preamble is seven octets long. The translation bridge converts the frames it
receives from the SR network to either Ethernet Version 2 or Ethernet 802.3
format. Then the translation bridge sends the frames to the transparent bridge for
forwarding.
When you configure the translation bridge, you select a default conversion, either
Ethernet 802.3 or Ethernet Version 2. When the translation bridge receives a frame
from the SR network, it converts the frame to the format you specified as the
default. You can specify exceptions to the default so that frames destined for
certain endstations use the other frame format.
Frame Lengths
SR and TB networks often use different maximum frame lengths. For example,
Ethernet networks support a maximum transmission unit (MTU) size of 1500
bytes, while Token Ring networks support much larger MTUs.
To resolve these differences, the translation bridge software specifies a maximum
size of 1470 in the largest-frame-size bits of the routing information field on all
frames forwarded to the SR network. The translation bridge cannot forward
frames it receives from the SR network that are larger than 1500 bytes.
MAC Address Formats
Ethernet networks transmit the least significant bit of each byte of a MAC address
first, while Token Ring networks transmit the most significant bit first. The
translation bridge, therefore, reverses the bits in the source and destination
addresses in the header of each frame it transfers between Ethernet and Token
Ring networks. You can also define explicit mappings between Ethernet group
addresses and Token Ring functional addresses. (Refer to “Editing
Translation
Bridge MAC Address Conversions” later in this chapter for details about MAC
address conversions.)
- 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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