Configuration Prerequisites; Configuring An Ospfv3 Stub Area; Configuring An Ospfv3 Virtual Link - HP MSR Series Configuration Manual

Splitting an OSPFv3 AS into multiple areas reduces the number of LSAs and extends OSPFv3
applications. For those non-backbone areas residing on the AS boundary, configure them as stub areas
to further reduce the size of routing tables and the number of LSAs.
Non-backbone areas exchange routing information through the backbone area. The backbone and
non-backbone areas (including the backbone itself) must be contiguous. In practice, necessary physical
links might not be available for this connectivity. You can configure virtual links to address this issue.

Configuration prerequisites

Before you configure OSPFv3 area parameters, complete the following tasks:
Enable IPv6 packet forwarding.
•
Configure OSPFv3 basic functions.
•

Configuring an OSPFv3 stub area

Follow these guidelines when you configure an OSPFv3 stub area:
You cannot remove an OSPFv3 area directly. The area can be removed only when you remove all
•
configurations in area view and all interfaces attached to the area become down.
All the routers attached to a stub area must be configured with the stub command. The keyword
•
no-summary is only available on the ABR of the stub area.
If you use the stub command with the keyword no-summary on an ABR, the ABR advertises a
•
default route in an Inter-Area-Prefix-LSA into the stub area. No AS-external-LSA,
Inter-Area-Router-LSA, or other Inter-Area-Prefix-LSA is advertised in the area. The stub area of this
kind is also known as a "totally stub area."
To configure an OSPFv3 stub area:
Step
1. Enter system view.
2. Enter OSPFv3 view.
3. Enter OSPFv3 area view.
4. Configure the area as a stub
area.
5. Specify a cost for the default
route advertised to the stub
area.

Configuring an OSPFv3 virtual link

You can configure a virtual link to maintain connectivity between a non-backbone area and the
backbone, or in the backbone itself.
IMPORTANT:
Both ends of a virtual link are ABRs that must be configured with the vlink-peer command.
•
• Do not configure virtual links in the areas of a GR-capable process.
Command
system-view
ospfv3 [ process-id ]
area area-id
stub [ no-summary ]
default-cost value
298
Remarks
N/A
N/A
N/A
Not configured by default.
Optional.
The cost for the default route
advertised to the stub area is 1.