Configuring Ospf Areas; Configuration Prerequisites; Configuring A Stub Area - HP 3600 v2 series Configuration Manual

NOTE:
A network segment can only belong to one area.
•
HP recommends configuring a description for each OSPF process to help identify purposes of processes
•
and for ease of management and memorization.
• HP recommends configuring a description for each area to help identify purposes of areas and for ease
of management and memorization.

Configuring OSPF areas

After splitting an OSPF AS into multiple areas, configure some areas as stub areas or NSSA areas as
needed.
If no connection can be achieved between the backbone and a non-backbone area, or within the
backbone itself, you can configure virtual links to solve it.

Configuration prerequisites

Before configuring an OSPF area, complete the following tasks:
Configure IP addresses for interfaces, making neighboring nodes accessible with each other at the
•
network layer.
Configure OSPF basic functions
•

Configuring a stub area

Configure a non-backbone area at the AS edge as a stub area by configuring the stub command on all
the routers attached to the area. In this way, Type-5 LSAs will not be flooded within the stub area,
reducing the routing table size. The ABR generates a default route into the stub area so all packets
destined outside of the AS are sent through the default route.
To further reduce the routing table size and routing information exchanged in the stub area, configure it
as a totally stub area by using the stub [ no-summary ] command on the ABR. In this way, neither AS
external routes nor inter-area routing information will be distributed into the area. All the packets destined
outside of the AS or area will be sent to the ABR for forwarding.
Follow these steps to configure OSPF areas:
To do...
Enter system view
Enter OSPF view
Enter area view
Configure the area as a stub area
Specify a cost for the default
route advertised to the stub area
Use the command...
system-view
ospf [ process-id | router-id router-id
| vpn-instance vpn-instance-name ]
*
area area-id
stub [ no-summary ]
default-cost cost
75
Remarks
—
—
—
Required
Not configured by default.
Optional
Defaults to 1.