3Com 5500-SI Configuration Manual page 239

Entering OSPF Area View
Perform the following configurations in OSPF View.
Table 222 Entering OSPF Area View
Operation
Enter an OSPF Area View
Delete a designated OSPF area
is the ID of the OSPF area, which can be a decimal integer or in IP address
area_id
format.
Specifying the Interface
OSPF divides the AS into different areas. You must configure each OSPF interface to
belong to a particular area, identified by an area ID. The areas transfer routing
information between them through the ABRs.
In addition, parameters of all the routers in the same area should be identical.
Therefore, when configuring the routers in the same area, please note that most
configurations should be based on the area. An incorrect configuration can disable
the neighboring routers from transmitting information, and lead to congestion or
self-loop of the routing information.
Perform the following configuration in OSPF Area View.
Table 223 Specifying interface
Operation
Specify an interface to run OSPF
Disable OSPF on the interface
You must specify the segment to which the OSPF will be applied after enabling OSPF.
can be IP address mask or IP address wildcard shielded text (similar to the
ip-mask
complement of the IP address mask).
Configuring a Router ID
A Router ID is a 32-bit unsigned integer that uniquely identifies a router within an AS.
A Router ID can be configured manually. If a Router ID is not configured, the system
selects the IP address of an interface automatically. When you set a Router ID
manually, you must guarantee that the IDs of any two routers in the AS are unique. It
is usual to set the router ID to be the IP address of an interface on the router.
Perform the following configurations in System View.
Table 224 Configuring a router ID
Operation
Configure a Router ID
Remove the router ID
To ensure the stability of OSPF, you must determine the division of router IDs and
manually configure them when implementing network planning.
Command
area area_id
undo area area_id
Command
network ip_address ip_mask
undo network ip_address ip_mask
Command
router id router_id
undo router id
OSPF Configuration 239