Dell S4048-ON, Configuration Manual

Page: 588 / 1039

OSPF functions and features, such as MD5 Authentication, Grace Period, Authentication Wait Time, are assigned on a per interface
basis.
NOTE: If using features like MD5 Authentication, ensure all the neighboring routers are also configured for MD5.
In the example below, an IP address is assigned to an interface and an OSPFv2 area is defined that includes the IP address of a Layer
3 interface.
The first bold lines assign an IP address to a Layer 3 interface, and the
no shutdown
command ensures that the interface is UP.
The second bold line assigns the IP address of an interface to an area.
Example of Enabling OSPFv2 and Assigning an Area to an Interface
Dell#(conf)#int te 4/14
Dell (conf-if-te-4/14)#ip address 10.10.10.10/24
Dell (conf-if-te-4/14)#no shutdown
Dell(conf-if-te-4/14)#ex
Dell(conf)#router ospf 1
Dell(conf-router_ospf-1)#network 1.2.3.4/24 area 0
Dell (conf-router_ospf-1)#network 10.10.10.10/24 area 1
Dell(conf-router_ospf-1)#network 20.20.20.20/24 area 2
Dell(conf-router_ospf-1)#
Dell#
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
Dell>show ip ospf 1 interface
TenGigabitEthernet 1/17 is up, line protocol is up
Internet Address 10.2.2.1/24, Area 0.0.0.0
Process ID 1, Router ID 11.1.2.1, Network Type BROADCAST, Cost: 1
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 11.1.2.1, Interface address 10.2.2.1
Backup Designated Router (ID) 0.0.0.0, Interface address 0.0.0.0
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:04
Neighbor Count is 0, Adjacent neighbor count is 0
TenGigabitEthernet 1/21 is up, line protocol is up
Internet Address 10.2.3.1/24, Area 0.0.0.0
Process ID 1, Router ID 11.1.2.1, Network Type BROADCAST, Cost: 1
Transmit Delay is 1 sec, State BDR, Priority 1
Designated Router (ID) 13.1.1.1, Interface address 10.2.3.2
Backup Designated Router (ID) 11.1.2.1, Interface address 10.2.3.1
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:05
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 13.1.1.1 (Designated Router)
Dell>
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
Dell#show ip ospf 1 int
588
Open Shortest Path First (OSPFv2 and OSPFv3)