Chapter 29
| IP Routing Commands
Open Shortest Path First (OSPFv3)
– 890 –
Example
This example redistributes automatically connected routes as Type 1 external
routes.
Console(config-router)#redistribute connected metric-type 1
Console(config-router)#
Area Configuration
area stub This command defines a stub area. To remove a stub, use the no form without the
optional keyword. To remove the summary attribute, use the no form with the
summary keyword.
Syntax
[no] area area-id stub [no-summary]
area-id - Identifies the stub area. The area ID can be in the form of an IPv4
address or as a four octet unsigned integer ranging from 0-4294967295.
no-summary - Stops an Area Border Router (ABR) from sending summary
link advertisements into the stub area.
Command Mode
Router Configuration
Default Setting
No stub is configured.
Summary advertisement are sent into the stub.
Command Usage
â—† All routers in a stub must be configured with the same area ID.
â—† Routing table space is saved by stopping an ABR from flooding Type-4 Inter-
Area Router and Type 5 AS-External LSAs into the stub. Since no information on
external routes is known inside the stub, an ABR will advertise the default route
0::0/0 using a Type 3 Inter-Area Prefix LSA.
â—† The default setting for this command blocks Type-4 Inter-Area Router and Type
5 AS-External LSAs. Therefore, any destinations that cannot be matched to an
inter-area or intra-area route will have to use the default route.
â—† Use the no-summary parameter of this command on an ABR attached to the
stub to define a totally stubby area, blocking all Type 3 network summary LSAs.
Define an area as a totally stubby area only if routers in the area do not require
summary LSAs from other areas.
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