Avaya Configuring IP, ARP, RIP, and OSPF Services Manual de usuario Pagina 217
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Customizing OSPF Services
117356-E Rev 00
6-47
Configuring a Not-So-Stubby Area (NSSA)
An OSPF not-so-stubby area (NSSA) is similar to an OSPF stub area except that,
to a limited degree, an NSSA can import AS external routes. Like a stub area, an
NSSA consumes less memory and CPU resources by preventing the flooding of
AS external link-state advertisements (LSAs) into the area and by using default
routing to external destinations. Unlike a stub area, however, an NSSA is more
flexible because it can import external routes into an OSPF routing domain.
You must configure type 7 address ranges to allow OSPF NSSA border routers to
control the summarization of external routes for the NSSA. For example, the
NSSA in Figure 1-5
on page 1-15 has been configured to import type 7 LSAs
through NSSA AS boundary router 15. NSSA border router 11 then translates
type 7 LSAs with the propagate bit set to type 5 LSAs and floods them into all
non-stub areas.
Using the BCC
To configure a not-so-stubby area (NSSA), navigate to the area prompt (for
example,
box; ip; ospf; area/0.0.0.1
) and enter:
area-type nssa
To change the default values for NSSA area parameters, enter:
<area_parameter> <value>
area_parameter value
is one of the parameter/value pairs listed in Table 6-7.
6. Set the following parameters:
•
Import AS Extern
•
Stub Default Metric
•
Import Summaries
Click on
Help
or see the parameter
descriptions beginning on page A-50
.
7. Click on
Apply
, and then click on
Done
. You return to the Configuration Manager
window.
Site Manager Procedure
(continued)
You do this System responds
- 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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