Users Guide

In OSPFv2, neighbors on broadcast and non-broadcast multiple access (NBMA) network links are identified by their interface
addresses, while neighbors on other types of links are identified by router-identifiers (RID).
Enable OSPFv2
OSPFv2 is disabled by default. Configure at least one interface as either Physical or Loopback and assign an IP address to the
interface. You can assign any area besides area 0 a number ID. The OSPFv2 process starts automatically when you configure it
globally and you can enable it for one or more interfaces.
1. Enable OSPF globally and configure an OSPF instance in CONFIGURATION mode.
router ospf instance-number
2. Enter the interface information to configure the interface for OSPF in INTERFACE mode.
interface ethernet node/slot/port[:subport]
3. Enable the interface in INTERFACE mode.
no shutdown
4. Disable the default switchport configuration and remove it from an interface or a LAG port in INTERFACE mode.
no switchport
5. Assign an IP address to the interface in INTERFACE mode.
ip address ip-address/mask
6. Enable OSPFv2 on an interface in INTERFACE mode.
ip ospf process-id area area-id
● process-id—Enter the OSPFv2 process ID for a specific OSPF process, from 1 to 65535.
● area-id—Enter the OSPFv2 area ID as an IP address (A.B.C.D) or number, from 1 to 65535.
Enable OSPFv2 configuration
OS10(config)# router ospf 100
OS10(conf-router-ospf-100)# exit
OS10(config)# interface ethernet 1/1/1
OS10(conf-if-eth1/1/1)# no shutdown
OS10(conf-if-eth1/1/1)# no switchport
OS10(conf-if-eth1/1/1)# ip address 11.1.1.1/24
OS10(conf-if-eth1/1/1)# ip ospf 100 area 0.0.0.0
View OSPFv2 configuration
OS10# show running-configuration ospf
!
interface ethernet1/1/1
ip ospf 100 area 0.0.0.0
!
router ospf 100
...
Enable OSPFv2 in a non-default VRF instance
To enable OSPFv2 in a non-default VRF instance:
1. Create a non-default VRF instance in which you want to enable OSPFv2:
ip vrf vrf-name
Layer 3
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