Dell Z9500 Configuration Manual page 586

Example of Enabling OSPFv2 and Assigning an Area to an Interface
Dell Networking recommends using the interface IP addresses for the OSPFv2 router ID for easier management and
troubleshooting.
To view the configuration, use the show config command in CONFIGURATION ROUTER OSPF mode.
OSPF, by default, sends hello packets out to all physical interfaces assigned an IP address that is a subset of a network on which
OSPF is enabled.
To view currently active interfaces and the areas assigned to them, use the show ip ospf interface command.
Example of Viewing Active Interfaces and Assigned Areas
Loopback interfaces also help the OSPF process. OSPF picks the highest interface address as the router-id and a Loopback
interface address has a higher precedence than other interface addresses.
Example of Viewing OSPF Status on a Loopback Interface
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 [vrf] database database-summary
2 Enter CONFIGURATION mode.
EXEC Privilege mode
configure
3 Enter ROUTER OSPF mode.
CONFIGURATION mode
router ospf process-id [vrf]
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)
Open Shortest Path First (OSPFv2 and OSPFv3) 586