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Using Source Routing Bridge Services
117351-A Rev. A 2-5
How IP Encapsulation Works
When you enable IP encapsulation on a source routing bridge (thus making it an
IP encapsulating bridge), you assign a single ring ID to the entire IP backbone
network. The source routing bridge assigns only a single route descriptor to the
frame’s RIF to describe the entire internet, regardless of the IP network size that
the frame traverses. Therefore, frames source routed over large IP networks can
remain within maximum hop-count restrictions.
Whenever a Bay Networks source routing bridge receives an explorer frame, the
bridge sends it toward an IP encapsulating bridge, which resides at the edge of the
IP backbone network. (For example, in F
igure 2-4, Bridges A, B, and C are IP
encapsulating bridges.) The IP encapsulating bridge encloses the source routed
frame within an IP header before it sends the frame out onto the network. When
the frame reaches a peer IP encapsulating bridge, the bridge removes the
encapsulation from the frame and sends it out the appropriate source routing
interfaces.
Each IP encapsulating bridge maintains a dynamic mapping of destination IP
addresses to the ring and bridge IDs of their directly attached rings. When an IP
encapsulating bridge receives a source routed frame, it performs these steps:
1. Checks the frame’s RIF for the ring and bridge ID that immediately follow the
IP network ring and bridge ID in the RIF
2. Looks up the IP address that corresponds with this ring and bridge ID
3. Encapsulates the frame in an IP packet with the destination IP address
4. Sends the frame out onto the IP network
For example, F
igure 2-4 shows the IP mapping table for IP encapsulating
bridge A.
- 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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