[no] area area-id
config>router>ospf
config>router>ospf3
Supported on all 7210 SAS platforms as described in this document
Commands in this context configure 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 configuration of all the interfaces, virtual links, address ranges, and so on, that are currently assigned to this area.
no area
Specifies the OSPF area ID, expressed in dotted decimal notation or as a 32-bit decimal integer.
area-range ip-prefix/mask [advertise | not-advertise]
no area-range ip-prefix/mask
no area-range ipv6-prefix/prefix-length
area-range ipv6-prefix/prefix-length [advertise | not-advertise]
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
In the NSSA context, the option 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 IP prefix in dotted decimal notation for the range used by the ABR.
Specifies the subnet mask for the range.
Specifies whether to advertise the summarized range of addresses into other areas. The advertise keyword indicates the range is advertised, and the not-advertise keyword indicates the range is not advertised.
[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. Existing routes that make up the aggregate 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
Supported on all 7210 SAS platforms as described in this document
This command configures the metric used by the 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.
lfa-policy-map route-nh-template template-name
no lfa-policy-map
config>router>ospf>area>interface
Supported on all 7210 SAS platforms as described in this document
This command applies a route next-hop policy template to an OSPF interface. When a route next-hop policy template is applied to an interface in OSPF, it is applied in all areas.
The command in an OSPF interface context can only be executed under the area in which the specified interface is primary, and then applied in that area and in all other areas where the interface is secondary. If the user attempts to apply it to an area where the interface is secondary, the command fails.
If the user excluded the interface from LFA using the command loopfree-alternate-exclude, the LFA policy, if applied to the interface, has no effect.
If the user applied a route next-hop policy template to a loopback interface or to the system interface, the command is not rejected, but the policy has no effect on the interface.
The no form of this command deletes the mapping of a route next-hop policy template to an OSPF interface.
Specifies the name of the template, 32 characters maximum.
[no] loopfree-alternate-exclude
config>router>ospf>area
config>router>ospf>area>interface
config>router>ospf3>area>interface
Supported on all 7210 SAS platforms as described in this document
This command instructs IGP to exclude a specific interface or all interfaces that are participating in a specific OSPF area in the SPF LFA computation. This reduces LFA SPF calculation where it is not needed.
When an interface is excluded from the LFA SPF in OSPF, it is excluded in all areas. However, the loopfree-alternate-exclude command can only be executed under the area in which the specified interface is primary. If the command is enabled, the interface is excluded in that area and in all other areas where the interface is secondary. If the user attempts to apply it to an area where the interface is secondary, the command fail.
The no form of this command reverts to the default value.
no loopfree-alternate-exclude
[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 OSPF3 Not So Stubby Area (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 an NSSA has the capability to flood external routes that it learns throughout its area and via an ABR to the entire OSPF or OSPF3 domain.
Existing virtual links of a non-stub or NSSA 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.
The no form of this command removes the NSSA designation and configuration context from the area.
no nssa
originate-default-route [type-7]
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 (3 or 7) into an NSSA by an NSSA ABR or ASBR.
When configuring an NSSA with no summaries, the ABR injects a type 3 LSA default route into the NSSA. 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 should be used for the default route.
Configure this 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 originate-default-route without the type-7 parameter.
[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 an 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 OSPF3 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 (providing it is an ASBR) throughout its area and via an ABR to the entire OSPF or OSPF3 domain.
The no form of this command disables the default behavior to automatically redistribute external routes into the NSSA 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
This command adds or removes the stub designation from an OSPF or OSPF3 area. Commands in this context configure the OSPF or OSPF3 stub 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 area or NSSA are 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>stub
config>router>ospf>area>nssa
config>router>ospf3>area>stub
config>router>ospf3>area>nssa
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 command is particularly useful to reduce the size of the routing and Link State Database (LSDB) tables within the stub area or NSSA.
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