|
|
2.3 | |
Single Area OSPF Configuration | |
| 2.3.1 | |
Configuring OSPF routing process |
| OSPF routing uses the concept of areas.
Each router contains a complete database of link-states in a specific
area. An area in the OSPF network, it may be assigned
any number from 0 to 65,535. However a single area is assigned the number 0 and is
known as area 0. In multi-area OSPF networks, all areas are required
to connect to area 0. Area 0 is also called the backbone area. OSPF configuration requires that the configuration be enabled on the
router with network addresses and area information.
To enable OSPF routing, use the global configuration command syntax:
The process ID is a number that is used to identify an OSPF routing process on the router. Multiple OSPF processes can be started on the same router. The number can be any value between 1 and 65,535. Most network administrators keep the same process ID throughout an autonomous system, but this is not a requirement. It is rarely necessary to run more than one OSPF process on a router. IP networks are advertised as follows in OSPF:
Each network must be identified with the area to which it belongs. The network address can be a whole network, a subnet, or the address of the interface. The wildcard mask represents the set of host addresses that the segment supports. This is different than a subnet mask, which is used when configuring IP addresses on interfaces.
|
Network
addresses are configured with a wildcard mask and not a subnet mask. The
wildcard mask represents the links or host addresses that can be present
in this segment. Area IDs can be written as a whole number or
dotted decimal notation.
Web Links