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Wendell Odom, CCIE No. 1624pearsonITcertification.com/odom

OSPF Concepts and Configuration

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R4

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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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10.1.13.1

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S0/1/0

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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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S0/1/0

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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

Fa0/0

10.1.1.1

10.1.12.1

10.1.14.1

10.1.13.1

S0/0/0

S0/0/1

S0/1/0

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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

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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Single Area OSPF Design

Area 0

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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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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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10.1.1.1

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 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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