[no] area area-id
config>router>ospf
config>router>ospf3
Supported on all 7210 SAS platforms as described in this document
This command configures an OSPF or OSPF3 area. An area is a collection of network segments within an AS that have been administratively grouped together. The area ID can be specified in dotted decimal notation or as a 32-bit decimal integer.
The no form of this command deletes the specified area from the configuration. Deleting the area also removes the OSPF or OSPF3 configuration of all the interfaces, virtual-links, and address-ranges that are currently assigned to this area.
no area
Specifies the OSPF or OSPF3 area ID expressed in dotted decimal notation or as a 32-bit decimal integer.
area-range ipv4-prefix/mask | ipv6-prefix/prefix-length [advertise | not-advertise]
no area-range ipv4-prefix/mask | ipv6-prefix/prefix-length
config>router>ospf>area
config>router>ospf>area>nssa
config>router>ospf3>area
config>router>ospf3>area>nssa
Supported on all 7210 SAS platforms as described in this document
This command creates ranges of addresses on an Area Border Router (ABR) for the purpose of route summarization or suppression. When a range is created, the range is configured to be advertised or not advertised into other areas. Multiple range commands may be used to summarize or hide different ranges. In the case of overlapping ranges, the most specific range command applies.
ABRs send summary link advertisements to describe routes to other areas. To minimize the number of advertisements that are flooded, you can summarize a range of IP addresses and send reachability information about these addresses in an LSA.
The no form of this command deletes the range advertisement or non-advertisement.
no area-range
Specifies that the range applies to external routes (via type-7 LSAs) learned within the NSSA when the routes are advertised to other areas as type-5 LSAs.
If this command is not entered under the NSSA context, the range applies to summary LSAs even if the area is an NSSA
Specifies the IPv4 prefix for the range in dotted-decimal notation and the subnet mask for the range, expressed as a decimal integer.
Specifies the IPv6 prefix for the range in hexadecimal notation, and the prefix length for the range, expressed as a decimal integer.
Specifies whether to advertise the summarized range of addresses to other areas.
[no] blackhole-aggregate
config>router>ospf>area
config>router>ospf3>area
Supported on all 7210 SAS platforms as described in this document
This command installs a low priority blackhole route for the entire aggregate. Exisiting routes that make up the aggregate will have a higher priority and only the components of the range for which no route exists are blackholed.
It is possible that when performing area aggregation, addresses may be included in the range for which no actual route exists. This can cause routing loops. To avoid this problem, configure the blackhole-aggregate option.
The no form of this command removes this option.
blackhole-aggregate
default-metric metric
no default-metric
config>router>ospf>area>stub
config>router>ospf3>area>stub
Supported on all 7210 SAS platforms as described in this document
This command configures the metric used by the area border router (ABR) for the default route into a stub area.
The default metric should only be configured on an ABR of a stub area.
An ABR generates a default route if the area is a stub area.
The no form of this command reverts to the default value.
default-metric 1
Specifies the metric, expressed as a decimal integer, for the default route cost to be advertised into the stub area.
key-rollover-interval seconds
no key-rollover-interval
config>router>ospf3>area
Supported on all 7210 SAS platforms as described in this document
This command configures the key rollover interval.
The no form of this command resets the configured interval to the default setting.
key-rollover-interval 10
Specifies the time, in seconds, after which a key rollover will start.
[no] nssa
config>router>ospf>area
config>router>ospf3>area
Supported on all 7210 SAS platforms as described in this document
Commands in this context configure an OSPF or OSPFv3 NSSA and adds or removes the NSSA designation from the area.
NSSAs are similar to stub areas in that no external routes are imported into the area from other OSPF areas. The major difference between a stub area and an NSSA is that an NSSA has the capability to flood external routes that it learns throughout its area and via an ABR to the entire OSPF or OSPFv3 domain.
Existing virtual links of a non-stub area or NSSA area are removed when the designation is changed to NSSA or stub.
An area can be designated as stub or NSSA, but never both at the same time.
By default, an area is not configured as an NSSA area.
The no form of this command removes the NSSA designation and configuration context from the area.
no nssa
originate-default-route [type-7]
originate-default-route [type-nssa]
no originate-default-route
config>router>ospf>area>nssa
config>router>ospf3>area>nssa
Supported on all 7210 SAS platforms as described in this document
This command enables the generation of a default route and its LSA type into an NSSA by an NSSA ABR or ASBR.
The functionality of the type-7 parameter and the type-nssa parameter is the same. The type-7 parameter is available in the ospf context; the type-nssa parameter is available in the ospf3 context. Include the type-7 or type-nssa parameter to inject a type 7 LSA default route instead of the type 3 LSA into the NSSA configured with no summaries.
To revert to a type 3 LSA, enter the originate-default-route command without the type-7 or type-nssa parameter.
When configuring an NSSA with no summaries, the ABR will inject a type 3 LSA default route into the NSSA area. Some older implementations expect a type 7 LSA default route.
The no form of this command disables origination of a default route.
no originate-default-route
Specifies that a type 7 LSA or type NSSA should be used for the default route.
[no] redistribute-external
config>router>ospf>area>nssa
config>router>ospf3>area>nssa
Supported on all 7210 SAS platforms as described in this document
This command enables the redistribution of external routes into the NSSA or an NSSA ABR that is exporting the routes into non-NSSA areas.
NSSAs are similar to stub areas in that no external routes are imported into the area from other OSPF or OSPFv3 areas. The major difference between a stub area and an NSSA is that the NSSA has the capability to flood external routes that it learns (provided it is an ASBR) throughout its area and via an Area Border Router to the entire OSPF or OSPFv3 domain.
The no form of this command disables the default behavior to automatically redistribute external routes into the NSSA area from the NSSA ABR.
redistribute-external
[no] stub
config>router>ospf>area
config>router>ospf3>area
Supported on all 7210 SAS platforms as described in this document
Commands in this context configure an OSPF or OSPF3 stub area and adds or removes the stub designation from the area.
External routing information is not flooded into stub areas. All routers in the stub area must be configured with the stub command. An OSPF or OSPF3 area cannot be both an NSSA and a stub area.
Existing virtual links of a non-stub or NSSA area will be removed when its designation is changed to NSSA or stub.
By default, an area is not a stub area.
The no form of this command removes the stub designation and configuration context from the area.
no stub
[no] summaries
config>router>ospf>area>nssa
config>router>ospf>area>stub
config>router>ospf3>area>nssa
config>router>ospf3>area>stub
Supported on all 7210 SAS platforms as described in this document
This command enables sending summary (type 3) advertisements into a stub area or NSSA on an ABR.
This parameter is particularly useful to reduce the size of the routing and link-state database (LSDB) tables within the stub or NSSA area.
By default, summary route advertisements are sent into the stub area or NSSA.
The no form of this command disables sending summary route advertisements and, for stub areas, only the default route is advertised by the ABR.
summaries