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Configuring IP, ARP, RARP, RIP, and OSPF Services
6-58
308627-14.20 Rev 00
Configuring an Area Border Router
Each OSPF area is connected to the backbone by one or more border routers. A
border router can have connections to multiple areas. In Figure 6-4
, for example,
border router 2 has an interface to a network in area B and an interface to a
network in area C.
Figure 6-4. Area Border Router
Each border router in an AS does the following:
• Receives routing information from its attached areas, creates summaries of
this information, and floods the summaries to the backbone and to any other
attached area. In Figure 6-4
, for example, border router 2 floods summaries
from area B to the backbone and to area C. Through the backbone, the
summaries are flooded to all other areas in the AS.
• Receives (through the backbone) summaries from other border routers, uses
this information to create new routing summaries (which add in the cost of the
backbone routes), and floods the new summaries to its attached areas.
Backbone network
Area B network
Area A network
Area C
internal
router
Area B
internal
router
Area A
internal
router
Border
router 2
Border
router 1
Area C network
IP0002A
- Configuring IP, ARP, RARP 1
- RIP, and OSPF Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 308627-14.20 Rev 00 10
- Before You Begin 17
- Text Conventions 18
- Acronyms 19
- Related Publications 21
- How to Get Help 22
- Chapter 1 23
- IP Addresses 24
- Subnet Addressing 26
- Supernet Addressing 29
- Autonomous Systems 30
- Figure 1-4. ARP Example 33
- OSPF Neighbors 37
- Neighbor Adjacencies 37
- Designated Routers 38
- AS External Routes 38
- OSPF Areas 39
- OSPF Router Types 41
- OSPF Implementation Notes 41
- Router Discovery Protocol 42
- Route Preferences 43
- Route Weights 44
- Figure 1-7. IP Routing Table 46
- IP Traffic Filters 50
- Chapter 2 51
- Starting IP Services 51
- Starting RIP 53
- Starting OSPF 54
- Starting Router Discovery 54
- Adding RIP to an IP Interface 57
- Starting RARP 59
- Chapter 3 61
- Setting the ICMP Error Limit 75
- Caution: 81
- Customizing an IP Interface 84
- Specifying a MAC Address 97
- IP0012A 99
- Using the BCC 100
- Using Site Manager 100
- Configuring an SMDS Address 102
- (continued) 103
- Deleting IP from an Interface 106
- Defining a Static Route 117
- (continued) 119
- Defining a Default Route 121
- Customizing Router Discovery 122
- Choosing a Broadcast Type 124
- Chapter 4 129
- Customizing ARP 130
- Customizing Global ARP 131
- Figure 4-1. Proxy ARP Example 137
- Customizing RARP 141
- Deleting RARP Globally 144
- Chapter 5 145
- Customizing RIP Services 145
- Setting the RIP Diameter 146
- Customizing a RIP Interface 147
- Selecting the RIP Version 148
- ) and enter: 149
- Specifying the Update Mode 153
- Sending Triggered Updates 155
- Receiving RIP Updates 158
- Listening for a Default Route 161
- Defining a RIP Accept Policy 170
- Chapter 6 185
- Customizing OSPF Services 185
- Supplying an OSPF Router ID 188
- Figure 6-1. OSPF ASE Routes 193
- Setting the Holddown Timer 198
- <value> 199
- <seconds> 199
- Configuring Message Logging 200
- Changing the Area ID 205
- Specifying the Interface Type 206
- Estimating the Transit Delay 210
- Setting the Hello Interval 212
- Setting the Dead Interval 214
- Specifying the Metric Cost 217
- Specifying the MTU Size 219
- Examples 223
- Configuring Areas 226
- Configuring Authentication 229
- Configuring a Summary Route 231
- Configuring a Stub Area 233
- Transit area 244
- Policies 257
- Appendix A 263
- Site Manager Parameters 263
- IP Parameters 264
- IP Interface Parameters 266
- IP Global Parameters 280
- Static Route Parameters 289
- Adjacent Host Parameters 292
- Router Discovery Parameters 295
- RARP Parameters 297
- OSPF Parameters 298
- OSPF Global Parameters 299
- OSPF Interface Parameters 303
- OSPF Area Parameters 311
- Area Range Parameters 315
- OSPF NSSA Range Parameters 318
- RIP Parameters 324
- Manager online Help 331
- RIP Accept Policy Parameters 335
- OSPF Accept Policy Parameters 337
- Appendix B 353
- RIP Import Filters 354
- RIP Export Filters 357
- OSPF Import Filters 360
- OSPF Export Filters 363
- Appendix C 367
- Route Weight Worksheet 367
- Appendix D 371
- IP/OSPF Configuration Example 371
- Manager and the BCC 374
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