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Configuring IP, ARP, RIP, and OSPF Services
6-52
117356-E 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 6-5
, for example,
border router 2 has an interface to a network in area B and an interface to a
network in area C.
Figure 6-5. 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 forwards the summaries to the backbone and to any
other attached area. In Figure 6-5
, for example, border router 2 floods
summaries from area B to the backbone and to area C. Through the backbone,
the summaries are forwarded to all other areas in the AS.
• Receives (via 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 forwards 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, RIP 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 117356-E 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 32
- OSPF Neighbors 35
- Neighbor Adjacencies 35
- Designated Routers 36
- OSPF Areas 37
- OSPF Router Types 39
- AS External Routes 39
- OSPF Implementation Notes 40
- Router Discovery Protocol 41
- Route Preferences 41
- Route Weights 42
- Figure 1-6. IP Routing Table 44
- IP Traffic Filters 47
- Chapter 2 49
- Starting IP Services 49
- Starting RIP 51
- Starting OSPF 52
- Starting Router Discovery 52
- Adding RIP to an IP Interface 55
- RIP advertises subnets 61
- Chapter 3 63
- Caution: 80
- Customizing an IP Interface 82
- Configuring an SMDS Address 98
- Using the BCC 101
- Using Site Manager 102
- Deleting IP from an Interface 105
- Defining a Static Route 109
- (continued) 111
- (continued) 112
- Choosing a Broadcast Type 115
- Chapter 4 119
- <state> 120
- Figure 4-1. Proxy ARP Example 125
- Chapter 5 131
- Customizing RIP Services 131
- Defining a RIP Accept Policy 154
- Chapter 6 171
- Customizing OSPF Services 171
- Figure 6-1. OSPF ASE Routes 179
- Specifying the Metric Cost 203
- Appendix A 241
- Site Manager Parameters 241
- IP Parameters 242
- IP Interface Parameters 244
- IP Global Parameters 259
- Static Route Parameters 266
- Adjacent Host Parameters 270
- Router Discovery Parameters 273
- OSPF Parameters 275
- OSPF Interface Parameters 280
- OSPF Area Parameters 289
- Area Range Parameters 293
- OSPF NSSA Range Parameters 296
- RIP Parameters 302
- Appendix B 309
- Routing Policy Parameters 309
- RIP Accept Policy Parameters 313
- OSPF Accept Policy Parameters 314
- Appendix C 331
- RIP Export Filters 335
- OSPF Import Filters 338
- OSPF Export Filters 339
- Appendix D 343
- Route Weight Worksheet 343
- Appendix E 347
- IP/OSPF Configuration Example 347
- Area 0.0.0.1STUB area 0.0.0.2 348
- Backbone 0.0.0.0 348
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