area stub
31-16 OSPFv3 Configuration
Parameters
Defaults
Area address ranges are not configured by default.
Mode
Router OSPFv3 configuration: C3(su)->router(Config-router)#
Usage
Address ranges control the advertisement of routes across area boundaries. Routing information
is summarized, or aggregated, at area boundaries. External to the area, at most a single route is
advertised (via an inter-area-prefix-LSA) for each address range. A route is advertised if and only
if the address range’s status is set to advertise. The default condition is to advertise.
For ABRs configured for NSSA, route summarization/aggregation can be implemented based on
LSA type — either summary LSAs (specified with the summarylink parameter), or NSSA external
LSAs Type 7 (specified with the nssaexternallink parameter).
You can configure multiple address ranges with this command.
Use the no form of this command to remove a configured address range.
Example
This example configures an address range to be consolidated and advertised based on summary
LSAs.
C3(su)->router(Config-router)# area 20 range 3FFe:501::/32 summarylink
area stub
This command creates a stub area for the specified area ID.
Syntax
area areaid stub
no area areaid stub
areaid Specifies the area ID in IP address format (dotted-quad) or as a decimal
value.
ipv6-prefix/prefix-length Specifies IPv6 prefix and the length of the IPv6 prefix for the address
range. The prefix must be specified in hexadecimal using 16-bit values
between colons.
The value of prefix-length is a decimal number indicating the number of
high-order contiguous bits that comprise the prefix.
summarylink Specifies that route summarization should be based on summary LSAs.
nssaexternallink Specifies that route summarization should be based on external LSAs
Type 7.
advertise |
not-advertise
(Optional) Specifies whether or not the routes should be advertised. If
neither parameter is specifies, the default is advertise.
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