Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 473

The OSPFv2 process evaluates the network commands in the order they are configured. Assign the network address that is most explicit first to include all subnets of that address. For example, if you assign the network address 10.0.0.0 /8, you cannot assign the network address 10.1.0.0 /16 since it is already included in the first network address. When configuring the network command, you must configure a network address and mask that is a superset of the IP subnet configured on the Layer-3 interface to be used for OSPFv2. Use this command in CONFIGURATION ROUTER OSPF mode to set up each neighbor and OSPF area. The Area can be assigned by a number or with an IP interface address. Command Syntax network ip-address mask area area-id Command Mode Usage CONFIG-ROUTER-OSPF-id Enable OSPFv2 on an interface and assign an network address range to a specific OSPF area. IP Address Format: A.B.C.D/M Area ID Range: 0-65535 or A.B.C.D/M Enable OSPFv2 on interfaces Each interface must have OSPFv2 enabled on it. It must be configured for Layer 3 protocol, and not be shutdown. OSPFv2 can also be assigned to a loopback interface as a virtual interface. OSPF functions and features, such as MD5 Authentication, Grace Period, Authentication Wait Time, etc, are assigned on a per interface basis. Note: If using features like MD5 Authentication, ensure all the neighboring routers are also configured for MD5. Figure 24-9 presents an example of assigning an IP address to an interface and then assigning an OSPFv2 area that includes that Layer-3 interface's IP address. Figure 24-9. Configuring an OSPF Area Example Force10#(conf)#int gi 4/44 Force10(conf-if-gi-4/44)#ip address 10.10.10.10/24 Force10(conf-if-gi-4/44)#no shutdown Force10(conf-if-gi-4/44)#ex Force10(conf)#router ospf 1 Force10(conf-router_ospf-1)#network 1.2.3.4/24 area 0 Force10(conf-router_ospf-1)#network 10.10.10.10/24 area 1 Force10(conf-router_ospf-1)#network 20.20.20.20/24 area 2 Force10(conf-router_ospf-1)# Force10# Assign Layer-3 interface with IP Address and no shutdown Assign interface's IP Address to an Area Dell Force10 recommends that the OSPFv2 Router ID be the interface IP addresses for easier management and troubleshooting. Use the show config command in CONFIGURATION ROUTER OSPF mode to view the configuration. Open Shortest Path First (OSPFv2 and OSPFv3) | 473