Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.100.0 - Page 589
Enabling Passive Interfaces, Enter ROUTER OSPF mode.
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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) Area 2.2.2.2 3.3.3.3 Dell# ID Router Network S-Net S-ASBR Type-7 Subtotal 1 0 0 0 0 1 1 0 0 0 0 1 To view information on areas, use the show ip ospf process-id command in EXEC Privilege mode. Enabling Passive Interfaces A passive interface is one that does not send or receive routing information. Enabling passive interface suppresses routing updates on an interface. Although the passive interface does not send or receive routing updates, the network on that interface is still included in OSPF updates sent via other interfaces. To suppress the interface's participation on an OSPF interface, use the following command. This command stops the router from sending updates on that interface. • Specify whether all or some of the interfaces are passive. CONFIG-ROUTEROSPF- id mode passive-interface {default | interface} The default is enabled passive interfaces on ALL interfaces in the OSPF process. Open Shortest Path First (OSPFv2 and OSPFv3) 589
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