Avaya Configuring Bridging Services Uživatelský manuál Strana 148
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- Tabulka s obsahem
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Hodnocené. / 5. Na základě hodnocení zákazníků
Configuring Bridging Services
4-6 117351-A 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 8 octets. For Ethernet 802.3 frames, the preamble is
7 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 end stations 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. (See“Editing
Translation Bridge
MAC Address Conversions” on page 4-21 for details.)
LAN Speeds
When the translation bridge transfers frames between networks that have different
network speeds, the software automatically accommodates for variations in
throughput. If the difference in speeds is significant, the translation bridge may
drop some frames.
- 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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