Avaya Configuring Bridging Services Bedienungsanleitung Seite 29
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Using Transparent Bridge Services
114060 Rev. A 1-3
The bridge then forwards (relays to another network) or drops (discards) the frame
based on the forwarding table entries. When the bridge receives a frame, it
compares the frame’s destination address with addresses in the forwarding table.
One of these situations results:
• If the frame’s destination address is on the same LAN as its source address,
the bridge discards the frame; all nodes on that LAN already received this
frame.
• If the frame’s destination address is on a different LAN than its source
address, the bridge forwards the frame to that LAN.
• If there is no match for the frame’s destination address in the forwarding
table, the bridge forwards the frame to all networks except the one that
received the frame. This is called flooding.
• If the frame is destined for the bridge (for example, a spanning tree frame),
the bridge forwards the frame to the appropriate bridge entity and processes it
internally.
The Translation Process
The transparent bridge translates frames for bridging between Ethernet/802.3
LANs and FDDI LANs. When the transparent bridge receives Ethernet/802.3
frames destined for an FDDI LAN, it reformats those frames to the FDDI MAC
frame format. The transparent bridge sets the original MAC frame type in the
logical link control (LLC) header. Therefore, if the frame passes through a second,
FDDI-to-Ethernet/802.3 bridge, that bridge can translate the frame back to its
original format.
The bridge translates all Ethernet MAC frames to FDDI MAC and IEEE 802.2
LLC/Subnetwork Access Protocol (SNAP) encapsulation, as specified by RFC
1042. Protocols that adhere to RFC 1042 include DECnet Phase IV, Novell,
AppleTalk Phase I and II, Xerox Network System (XNS), Internet Package
Exchange (IPX), and Internet Protocol (IP).
Figure 1-2 shows the format and values of the LLC and SNAP headers of these
frames after translation.
Note: If a frame is forwarded or flooded to a LAN using a different data-link
level protocol, the bridge translates the frame to the appropriate frame format
before transmission.
- 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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