OSPF Concepts and Configuration
Presented by
Wendell Odom, CCIE No. 1624
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Today’s Sample Network
Fa0/0
10.1.12.2
S0/0/1
R2
10.2.2.2
10.1.12.1
S0/0/0
Fa0/0
10.1.1.1
S0/0/1
R1
10.1.13.1
S0/0/0
10.1.13.3
Fa0/0
R3
10.3.3.3
S0/1/0
10.1.14.1
S0/0/0
Fa0/0
10.1.14.4
R4
R4
10.4.4.4
For copies of key figures during the live show, browse to
Certskills.com, lower right.
OSPF Configuration Options
1) Enable OSPF
2) Enable OSPF on interfaces
3) Set Router ID
4) Set Hello and Dead Intervals
5) Tune OSPF metrics
6) Enable OSPF authentication
7) Set Number of equal routes
(router ospf process-id)
(network DDN WC_mask area area-id)
(router-id DDN, or
interface loopback number)
(ip ospf hello-interval number,
ip ospf dead-interval number)
(ip ospf cost number, or
bandwidth number, or
auto-cost-reference-bandwidth number )
(ip ospf authentication, or
area authentication)
(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
Exact Match (0.0.0.0)
Match Subnet (255.255.255.255
– Subnet_Mask)
Match Classful Network
(255.255.255.255 –
Network_Mask)
Match All (255.255.255.255)
Exact Match
network 10 .
10.1.12.1
1. 12 .
1
10 .
1.
1.
1
10 .
1 . 12 .
1
10 .
1 . 13 .
1
10 .
1 . 14 .
1
S0/0/0
Fa0/0
10.1.1.1
S0/0/1
R1
10.1.13.1
S0/1/0
10.1.14.1
0.
0.
0.
0
OSPF WC Mask Options
Exact Match (0.0.0.0)
Match Subnet (255.255.255.255
– Subnet_Mask)
Match Classful Network
(255.255.255.255 –
Network_Mask)
Match All (255.255.255.255)
Match Subnet
255 . 255 . 255 . 255
255 . 255 . 255 . 0 Subnet Mask
0.
0.
0 . 255 Wildcard Mask
Match Subnet
network 10 .
10.1.12.1
1. 12 .
1
0
10 .
1.
1.
1
10 .
1 . 12 .
1
10 .
1 . 13 .
1
10 .
1 . 14 .
1
S0/0/0
Fa0/0
10.1.1.1
S0/0/1
R1
10.1.13.1
S0/1/0
10.1.14.1
0.
0.
0 .255
OSPF WC Mask Options
Exact Match (0.0.0.0)
Match Subnet (255.255.255.255
– Subnet_Mask)
Match Classful Network
(255.255.255.255 –
Network_Mask)
Match All (255.255.255.255)
Match Class A Network
255 . 255 . 255 . 255
255 . 0 . 0 . 0 Default Class A Network Mask
0 . 255 . 255 . 255 Wildcard Mask
Match Network
network 10 .
10.1.12.1
1. 12
0.
0.
1
0
10 .
1.
1.
1
10 .
1 . 12 .
1
10 .
1 . 13 .
1
10 .
1 . 14 .
1
S0/0/0
Fa0/0
10.1.1.1
S0/0/1
R1
10.1.13.1
S0/1/0
10.1.14.1
0 .255 . 255 .255
OSPF WC Mask Options
Exact Match (0.0.0.0)
Match Subnet (255.255.255.255
– Subnet_Mask)
Match Classful Network
(255.255.255.255 –
Network_Mask)
Match All (255.255.255.255)
Match All
network 10
0.
10.1.12.1
1. 12
0.
0.
1
0
10 .
1.
1.
1
10 .
1 . 12 .
1
10 .
1 . 13 .
1
10 .
1 . 14 .
1
S0/0/0
Fa0/0
10.1.1.1
S0/0/1
R1
10.1.13.1
S0/1/0
10.1.14.1
255 .255 . 255 .255
Exact Match (0.0.0.0)
Match Subnet (255.255.255.255
– Subnet_Mask)
Match Classful Network
(255.255.255.255 –
Network_Mask)
Match All (255.255.255.255)
Single Area OSPF Design
Area 0
Fa0/0
10.1.12.2
S0/0/1
R2
10.2.2.2
10.1.12.1
S0/0/0
Fa0/0
10.1.1.1
S0/0/1
R1
10.1.13.1
S0/0/0
10.1.13.3
Fa0/0
R3
10.3.3.3
S0/1/0
10.1.14.1
S0/0/0
Fa0/0
10.1.14.4
R4
R4
10.4.4.4
Single Area OSPF Config
router ospf 1
network 0.0.0.0
255.255.255.255
area 0
Fa0/0
10.1.12.2
router ospf 1
network 10.1.0.0
0.0.255.255 area 0
10.1.12.1
S0/0/0
Fa0/0
10.1.1.1
S0/0/1
R1
10.1.13.1
S0/0/1
router ospf 1
network 0.0.0.0
R2
255.255.255.255
S0/0/0
10.1.13.3
10.2.2.2
area 0
Fa0/0
R3
10.3.3.3
S0/1/0
10.1.14.1
router ospf 4
network 10.1.14.0
network 10.4.4.0
0.0.0.255
0.0.0.255
S0/0/0
Fa0/0
10.1.14.4
R4
R4
10.4.4.4
area 0
area 0
Multi-Area OSPF Design
Area 0
Fa0/0
10.1.12.2
S0/0/1
R2
10.2.2.2
10.1.12.1
S0/0/0
Fa0/0
10.1.1.1
S0/0/1
R1
10.1.13.1
S0/0/0
10.1.13.3
Fa0/0
R3
10.3.3.3
S0/1/0
10.1.14.1
Area 14
S0/0/0
Fa0/0
10.1.14.4
R4
R4
10.4.4.4
Multi-Area OSPF Config
(Unchanged)
router ospf 1
network 10.1.1.1
network 10.1.12.1
network 10.1.13.1
network 10.1.14.1
0.0.0.0
0.0.0.0
0.0.0.0
0.0.0.0
area
area
area
area
10.1.12.1
S0/0/0
Fa0/0
10.1.1.1
S0/0/1
R1
10.1.13.1
0
0
0
14
Fa0/0
10.1.12.2
S0/0/1
10.2.2.2
R2
(Unchanged)
S0/0/0
10.1.13.3
Fa0/0
R3
10.3.3.3
S0/1/0
10.1.14.1
router ospf 4
network 10.1.14.0
network 10.4.4.0
0.0.0.255
0.0.0.255
S0/0/0
Fa0/0
10.1.14.4
R4
R4
10.4.4.4
area 14
area 14
What are the OSPF Router IDs?
Fa0/0
10.1.12.2
S0/0/1
R2
10.2.2.2
10.1.12.1
S0/0/0
Fa0/0
10.1.1.1
S0/0/1
R1
10.1.13.1
S0/0/0
10.1.13.3
Fa0/0
R3
10.3.3.3
S0/1/0
10.1.14.1
S0/0/0
Fa0/0
10.1.14.4
R4
R4
10.4.4.4
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