Presented by
Wendell Odom, CCIE No. 1624pearsonITcertification.com/odom
OSPF Concepts and Configuration
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10.1.1.1
10.2.2.2
10.3.3.3
10.4.4.4
10.1.12.1
10.1.12.2
10.1.14.1
10.1.14.4
10.1.13.310.1.13.1
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Today’s Sample Network
For copies of key figures during the live show, browse to Certskills.com, lower right.
OSPF Configuration Options
1)Enable OSPF (router ospf process-id)2)Enable OSPF on interfaces (network DDN WC_mask area area-id)3)Set Router ID (router-id DDN, or
interface loopback number) 4)Set Hello and Dead Intervals (ip ospf hello-interval number,
ip ospf dead-interval number)5)Tune OSPF metrics (ip ospf cost number, or
bandwidth number, or
auto-cost-reference-bandwidth number )6)Enable OSPF authentication (ip ospf authentication, or
area authentication)• Set Number of equal routes (maximum-paths number)
Likely Points of CCNA Config Confusion
1)Mechanics of network commands and wildcard masks
2)“Best” options for same 3)OSPF Process ID matching (or not)4)Unique OSPF Router ID
OSPF WC Mask Options
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10.1.14.1
10.1.13.1
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10 . 1 . 1 . 1
network 10 . 1. 12 . 1
0 . 0 . 0 . 0
10 . 1 . 12 . 110 . 1 . 13 . 1
10 . 1 . 14 . 1
0 . 0 . 0 . 0
Exact Match
OSPF WC Mask Options
255 . 255 . 255 . 0 255 . 255 . 255 . 255
Match Subnet
0 . 0 . 0 . 255
Wildcard Mask
Subnet Mask
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10 . 1 . 1 . 1
network 10 . 1. 12 . 1
0 . 0 . 0 .255
10 . 1 . 12 . 110 . 1 . 13 . 1
10 . 1 . 14 . 1
0 . 0 . 0 .255network 10 . 1. 12 . 0
Match Subnet
OSPF WC Mask Options
255 . 0 . 0 . 0 255 . 255 . 255 . 255
Match Class A Network
0 . 255 . 255 . 255
Wildcard Mask
Default Class A Network Mask
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10 . 1 . 1 . 1
network 10 . 1. 12 . 1
0 .255 . 255 .255
10 . 1 . 12 . 110 . 1 . 13 . 1
10 . 1 . 14 . 1
0 .255 . 255 .255network 10 . 0. 0 . 0
Match Network
OSPF WC Mask Options
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10.1.14.1
10.1.13.1
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10 . 1 . 1 . 1
network 10 . 1. 12 . 1
255 .255 . 255 .255
10 . 1 . 12 . 110 . 1 . 13 . 1
10 . 1 . 14 . 1
255 .255 . 255 .255network 0 . 0. 0 . 0
Match All
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10.1.1.1
10.2.2.2
10.3.3.3
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10.1.12.1
10.1.12.2
10.1.14.1
10.1.14.4
10.1.13.310.1.13.1
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Single Area OSPF Design
Area 0
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10.1.13.310.1.13.1
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Single Area OSPF Config
router ospf 1 network 10.1.0.0 0.0.255.255 area 0
router ospf 1 network 0.0.0.0 255.255.255.255 area 0
router ospf 1 network 0.0.0.0 255.255.255.255 area 0
router ospf 4 network 10.1.14.0 0.0.0.255 area 0 network 10.4.4.0 0.0.0.255 area 0
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10.1.1.1
10.2.2.2
10.3.3.3
10.4.4.4
10.1.12.1
10.1.12.2
10.1.14.1
10.1.14.4
10.1.13.310.1.13.1
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Multi-Area OSPF Design
Area 0
Area 14
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10.2.2.2
10.3.3.3
10.4.4.4
10.1.12.1
10.1.12.2
10.1.14.1
10.1.14.4
10.1.13.310.1.13.1
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Multi-Area OSPF Config
router ospf 1 network 10.1.1.1 0.0.0.0 area 0 network 10.1.12.1 0.0.0.0 area 0 network 10.1.13.1 0.0.0.0 area 0 network 10.1.14.1 0.0.0.0 area 14
(Unchanged)
router ospf 4 network 10.1.14.0 0.0.0.255 area 14 network 10.4.4.0 0.0.0.255 area 14
(Unchanged)
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10.1.1.1
10.2.2.2
10.3.3.3
10.4.4.4
10.1.12.1
10.1.12.2
10.1.14.1
10.1.14.4
10.1.13.310.1.13.1
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What are the OSPF Router IDs?
10.1.14.1
10.2.2.2
10.3.3.3
10.4.4.4
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