Enabling OSPF

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Enabling OSPF

Context

After creating an OSPF process, you need to configure the network segments included in an area. A network segment belongs to only one area. That is, you need to specify an area for each interface that runs OSPF. In this document, network segment refers to the network segment to which the IP address of the OSPF interface belongs.

OSPF checks the network mask carried in a received Hello packets. If the network mask carried in a received Hello packet is different from the network mask of the local device, the Hello packet is discarded. As a result, an OSPF neighbor relationship is not established.

Procedure

Run system-view
The system view is displayed.
Run ospf [ process-id ]
The OSPF process view is displayed.
Run area area-idnetwork ip-address wildcard-maskinterface interface-type interface-numberospf enable [ process-id ] area area-id
The OSPF area view is displayed.

OSPF can be enabled in an OSPF area or on a specific interface.
- Enable OSPF in an OSPF area.
1. Run
  Network segments belonging to an area are configured.
  
  OSPF can properly run on an interface only when the following conditions are met:
  - The IP address mask length of the interface is equal to or greater than the mask length specified in the network command.
  - The primary IP address of the interface must be within the network segment specified by the network command.
  By default, OSPF advertises the IP address of the loopback interface as a 32-bit host route, which is irrelevant to the mask length configured on the loopback interface. To advertise routes to the network segment of the loopback interface, configure the network type as NBMA or broadcast in the interface view. For details, see Configuring Network Types of OSPF Interfaces.
- Enable OSPF on an interface.
1. Run the following command in the system view:interface interface-type interface-number
  The interface view is displayed.
2. Run ospf enable [ process-id ] area area-id
  OSPF is enabled on the interface.
  
  An area ID can be input in the format of a decimal integer or an IPv4 address, but displayed in the format of IPv4 address.

Translation

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Updated: 2022-05-16

Document ID: EDOC1000174069

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