Specifications

Configuring OSPF
Command Line Interface Protocol Configuration Guide 1-3
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Because stub and not-so-stubby areas do not carry external routes, an area can be
defined as a stub or not-so-stubby area only when:
❒ All OSPF routers inside the stub area are configured as stub routers. These routers
become neighbors.
❒ The area is not needed as a transit link for virtual links.
❒ No Autonomous System Boundary Router (ASBR) is internal to the stub area.
❒ The area is not the backbone area (area 0.0.0.0).
❒ There is a single exit point from the area or if there are multiple exits (Area Border
Routers), routing outside the area does not have to take an optimal path.
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This section describes how to configure and verify OSPF using the CLI. It also includes
configuration examples.
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To create a basic OSPF configuration:
1. Go to Global Configuration mode.
2. Set the OSPF router ID. For this to take effect, OSPF must be disabled.
3. Enable OSPF and enter Router: OSPF mode.
Cajun (configure)#
router ospf
Cajun (configure router:ospf)#
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no router ospf Disable OSPF.
ip ospf router-id
router-id
no ospf router-id
router-id
- the IP address of the router.
The
no
form of the command reverts to the
system default which is the lowest IP address
configured on the system.
Cajun (configure)#
no router ospf
Cajun (configure)#
ip ospf router-id 122.23.4.5