Create OSPFv3 Area Ranges

Create an area address range on the OSPFv3 router to reduce the number of area border router (ABR) advertisements into other OSPF areas. An area address range is an implied contiguous range of area network addresses for which the ABR advertises a single summary route.

Before you begin

You must create the OSPF area.
Change the VRF instance as required to configure OSPFv3 on a specific VRF instance.
Note
Non-default VRFs do not support the configuration of the following parameters:
- OSPFv3 interfaces over IPv6 tunnels
- IPSec on OSPFv3 virtual link interfaces

About this task

If you create two ranges, and one range is a subset of the other, the router uses the most specific match.

Procedure

In the navigation pane, expand Configuration > IPv6.
Select OSPFv3.
Select the Area Aggregate tab.
Select Insert.
Select the area ID.
Select the type of area.

interAreaPrefixLsa generates an aggregated summary.

nssaExternalLsa generates an NSSA link summary.
Type the prefix for the IPv6 area address.
Type the number of bits from the IPv6 address that you want to advertise.
Select Insert.

Area Aggregate Field Descriptions

Use the data in the following table to use the Area Aggregate tab.


Name	Description
AreaID	Specifies the area in which the address aggregate exists. Use dotted decimal notation to specify the area name.
AreaLsdbType	Specifies the area LSDB type to which the address aggregate applies. interAreaPrefixLsa generates an aggregated summary. nssaExternalLsa generates an NSSA link summary.
Prefix	Specifies the IPv6 prefix. The prefix and prefix length define the range.
PrefixLength	Specifies the length of the prefix, in bits. The prefix cannot be shorter than 3 bits. The prefix and prefix length define the range.
Effect	Specifies the advertisement mode for prefixes in the range. advertiseMatching advertises the aggregate summary LSA with the same link-state ID. doNotAdvertiseMatching does not advertise networks that fall within the range.
AdvertiseMetric	Specifies a cost value to advertise for the OSPF area range. This value applies to summary LSAs (Type 3). If the value is 0, OSPF uses the cost to the farthest point in the network that is summarized.