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The Implementing Cisco IP Routing - ROUTEExam: 642-902
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Advanced OSPF
Route Manipulation - Special Area Types
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Intro
OSPF Route Manipulation
Route Filtering
Route Summarization
Default Routing
OSPF Special Areas
Stub
Totally Stubby
NSSA
Totally NSSA
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Route Filtering
170.50.1.0/24
170.50.2.0/24
170.50.3.0/24
Using Filter List on ABRrouter ospf 1
area # filter-listprefix-list-name in|out
Using Distribute List on Normal Routers
router ospf 1distribute-listprefix-list-name in
ip prefix-list NET-170 deny 170.50.0.0/22 le 24
ip prefix-list NET-170 permit 0.0.0.0/0 le 32
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Route Summarization
170.50.1.0/24
170.50.2.0/24
170.50.3.0/24
Manual Summarization on ABR (specify source/originating
area)router ospf 1
area 0 range 170.50.0.0 255.255.252.0
Summarization on ASBRrouter ospf 1
ip summary-address 170.50.0.0 255.255.252.0
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Default Information Origination
Configurationrouter ospf 1
default-information originate [always]
170.50.1.0/24
170.50.2.0/24
170.50.3.0/24
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Special Areas
Stubby Areas
Totally Stubby Areas
Not So Stubby Areas NSSA
Totally NSSA
Area 0 Backbone
Area 2Area 1
Area 3
OSPF DomainRIP Domain
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170.50.1.0/24
170.50.2.0/24
170.50.3.0/24
Stubby Areas
Default route is injected by ABR
No type 5 LSA
router ospf 1
area # stub
area # default-metric metric (on ABR)
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Totally Stubby Areas
Default route is injected by ABR
No type 3 or type 5 LSA
ABR configuration
router ospf 1
area # stub no-summary
Other routers configuration
router ospf 1
area # stub
170.50.1.0/24
170.50.2.0/24
170.50.3.0/24
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170.50.1.0/24
170.50.2.0/24
170.50.3.0/24
Not So Stubby Areas NSSA
Redistribution is allowed using type 7 LSA
Default route is injected by ABR
No type 5 LSA
router ospf 1
area # stub
area # default-metric metric (on ABR)
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Totally NSSA
Redistribution is allowed using type 7 LSA
Default route is injected by ABR
No type 3 or type 5 LSA
ABR configuration
router ospf 1
area # stub no-summary
Other routers configuration
router ospf 1
area # stub
170.50.1.0/24
170.50.2.0/24
170.50.3.0/24
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Summary
OSPF Route Manipulation:
Route Filtering,
Route Summarization
Default Routing
OSPF Special Areas
Stub: no type 5 Totally Stubby: no type 3 or 5
NSSA : redistribution allowed and no type 5
Totally NSSA : redistribution allowed and no type 3 or 5
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