Configuring Ospf Areas; Configuration Prerequisites; Configuring A Stub Area - HPE FlexNetwork HSR6800 Configuration Manual

Step
Configure a global router
2.
ID.
Enable an OSPF process
3.
and enter OSPF view.
Configure a description for
4.
the OSPF process.
Configure an OSPF area
5.
and enter OSPF area view.
Configure a description for
6.
the area.
Specify a network to
7.
enable the interface
attached to the network to
run the OSPF process in
the area.

Configuring OSPF areas

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

Configuration prerequisites

Before you configure an OSPF area, complete the following tasks:
•
Configure IP addresses for interfaces.
•
Enable OSPF.

Configuring a stub area

You can configure a non-backbone area at an AS edge as a stub area. To do so, issue the stub
command on all the routers attached to the area. The routing table size is reduced because Type-5
LSAs are not flooded within the stub area. 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, you can
configure it as a totally stub area by using the stub no-summary command on the ABR. AS external
routes and inter-area routes are not distributed into the area. All the packets destined outside of the
area are sent to the ABR for forwarding.
To configure an OSPF stub area:
Command
router id router-id
ospf [ process-id |
router-id router-id |
vpn-instance
vpn-instance-name ] *
description description
area area-id
description description
network ip-address
wildcard-mask
64
Remarks
Optional.
Not configured by default.
If no global router ID is configured, the
highest loopback interface IP address, if
any, is used as the router ID. If no
loopback interface IP address is available,
the highest physical interface IP address is
used, regardless of the interface status.
Not enabled by default.
Optional.
Not configured by default.
Not configured by default.
Optional.
Not configured by default.
Not configured by default.
A network segment can belong to only one
area.