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3.0 CCNA - IP Connectivity

3.4 Configure and verify single area OSPFv2

1. Neighbor adjacencies,

2. Point-to-point,

3. Broadcast (DR/BDR selection),

4. Router ID

Configuring and verifying single area OSPFv2 involves several steps, including defining the OSPF process, defining network statements, and verifying the OSPF configuration and operation. Steps involved in configuration and verification of single area OSPFv2:

1. Define the OSPF process:

  • Configuration: "router ospf [process-id]"

  • Verification: "show running-config"

2. Define network statements:

  • Configuration: "network [network-address] [wildcard-mask] area [area-id]"

  • Verification: "show ip ospf interface"

3. Verify neighbor adjacencies:

  • Verification: "show ip ospf neighbor"

4. Configure point-to-point OSPF:

  • Configuration: "ip ospf network point-to-point"

  • Verification: "show ip ospf interface"

5. Configure broadcast OSPF and DR/BDR selection:

  • Configuration: "ip ospf network broadcast"

  • Verification: "show ip ospf interface"

6. Configure the Router ID:

  • Configuration: "router-id [IPv4-address]"

  • Verification: "show running-config" or "show ip ospf"

Note: The commands may vary depending on the router's operating system. The above commands are for general guidance purposes only.

Here is an example OSPF configuration for a single area on a Cisco router:

! Enable OSPF on the router
router ospf 1

! Define the OSPF process ID
! The process ID can be any number between 1 and 65535
router-id 1.1.1.1

! Define the network that should be advertised
! This network is 192.168.1.0/24
network 192.168.1.0 0.0.0.255 area 0

! Configure the OSPF timer values
timers throttle spf 5 10 10

! Configure the OSPF authentication parameters
! Replace "securepassword" with your desired password
! This example uses clear-text authentication
password-encryption
! Authentication Key ID
ip ospf message-digest-key 1 md5 securepassword
! Area 0
area 0 authentication message-digest

! Enable OSPF on the interface connected to the network
interface FastEthernet0/0
 ip address 192.168.1.1 255.255.255.0
 ip ospf 1 area 0

Note: The actual configuration may vary depending on the router's operating system and network requirements.

A wildcard mask is used in routing protocols, such as OSPF, to define the range of IP addresses that are part of a network. The wildcard mask is a 32-bit value that is used to match the IP addresses of interfaces on a network, and it is used in conjunction with a network address to define the network that the router should advertise.

The wildcard mask is created by inverting the subnet mask for a network. For example, if the subnet mask for a network is 255.255.255.0, the corresponding wildcard mask would be 0.0.0.255. In a network statement, the network address and wildcard mask are combined to define the network that should be advertised.

For example, the following OSPF network statement tells the router to advertise the network 192.168.1.0/24:

network 192.168.1.0 0.0.0.255 area 0

In this statement, the network address is 192.168.1.0 and the wildcard mask is 0.0.0.255. The combination of these two values defines the network 192.168.1.0/24 that the router should advertise.

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