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OSPF, the abbreviation for Open Shortest Path First, is an internal gateway protocol based on link state developed by IETF. The current version of OSPF is version 2 (RFC2328). OSPF is applicable to networks of any size. Its quick convergence feature can send update message immediately after the network topology has changed, and its algorithm assures it will not generate routing loops. OSFP also have the following characteristics:

  • Area division: divides the network of autonomous system into areas to facilitate management, thereby reducing the protocol’s CPU and memory utilization, and improving performance.
  • Classless routing: allows the use of variable length subnet mask.
  • ECMP: improves the utilization of multiple routes.
  • Multicasting: reduces the impact on non-OSPF devices.
  • Verification: interface-based packet verification ensures the security of the routing calculation.

Note: Autonomous system is a router and network group under the control of a management institution. All routers within an autonomous system must run the same routing protocol.

Creating OSPF

To create OSPF, take the following steps:

  1. Select Network > Routing > OSPF.
  2. From the Virtual Router drop-down list, select the Virtual Router for the new route.
  3. Click New.
  4. Click OK.
Configuration for OSPF on Hillstone device's interfaces includes: hello transmission interval, dead time, LSA transmit interval and LSU transmit delay time. For more information on how to configure OSPF on an interface, see Configuring an Interface.

Viewing the Neighbor Information

To view the neighbor information, take the following steps:

  1. Select Network > Routing > OSPF.
  2. Select the process ID check box, and the neighbor information will be displayed in the list below.

    • Neighbor Router ID: Shows the router ID of OSPF neighbors.
    • Priority: Shows the router priority. The router priority is used to determine which router will act as the designated router. The designated router will receive the link information of all the other routers in the network, and broadcast the received link information.
    • Neighbor State: Shows the OSPF neighbor state. The OSPF neighbor state includes 8 types: Down, Attempt, Init, 2-Way, Exstart, Exchange, Loading and Full. The Full state includes Full/DR and Full/BDR.
    • Timeout: Shows the neighbor timeout, which is the difference between dead time and hello transmission interval. The unit is second. If the OSPF doesn't receive the Hello packets from neighbor, the neighbor ship cannot be established continually.
    • Neighbor IP: Shows the IP address of neighbor router.
    • Local Interface: Shows the interface sends the Hello packets to the neighbor router.