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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Configuring Stub Areas

OSPF supports different types of LSAs to help reduce the amount of router processing within the areas.

Type 5 LSAs are not flooded into stub areas; the ABR advertises a default route into the stub area to which it is attached. Stub area routers use the default route to reach external destinations.

To ensure connectivity in your OSPFv2 network, never configure the backbone area as a stub area.

To configure a stub area, use the following commands.

  1. Review all areas after they were configured to determine which areas are NOT receiving type 5 LSAs. EXEC Privilege mode show ip ospf process-id database database-summary
  2. Enter CONFIGURATION mode. EXEC Privilege mode configure
  3. Enter ROUTER OSPF mode. CONFIGURATION mode router ospf process-id Process ID is the ID assigned when configuring OSPFv2 globally.
  4. Configure the area as a stub area. CONFIG-ROUTER-OSPF-id mode area area-id stub [no-summary] Use the keywords no-summary to prevent transmission into the area of summary ASBR LSAs. Area ID is the number or IP address assigned when creating the area.

Example of the show ip ospf database database-summary Command

To view which LSAs are transmitted, use the show ip ospf database process-id database-summary command in EXEC Privilege mode. 
Dell#show ip ospf 34 database database-summary
                                 
                                 OSPF Router with ID (10.1.2.100) (Process ID 34)
                                 
                                 Area     ID Router Network S-Net S-ASBR Type-7 Subtotal
                                 2.2.2.2  1         0       0     0      0      1
                                 3.3.3.3  1         0       0     0      0      1
                                 Dell#

To view information on areas, use the show ip ospf process-id command in EXEC Privilege mode.

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