OSPF Areas Tab

  • Network > Virtual Router > OSPF > Areas
The following fields describe the OSPF area settings:
OSPF – Areas Settings
Description
Areas
Area ID
Configure the area over which the OSPF parameters can be applied.
Enter an identifier for the area in x.x.x.x format. This is the identifier that each neighbor must accept to be part of the same area.
Type
Select one of the following options.
  • Normal
    —There are no restrictions; the area can carry all types of routes.
  • Stub
    —There is no outlet from the area. To reach a destination outside of the area, it is necessary to go through the border, which connects to other areas. If you select this option, select
    Accept Summary
    if you want to accept this type of link state advertisement (LSA) from other areas. Also, specify whether to include a default route LSA in advertisements to the stub area along with the associated metric value (range is 1-255).
If the
Accept Summary
option on a stub area Area Border Router (ABR) interface is disabled, the OSPF area will behave as a Totally Stubby Area (TSA) and the ABR will not propagate any summary LSAs.
  • NSSA
    (Not-So-Stubby Area)—It is possible to leave the area directly, but only by routes other than OSPF routes. If you select this option, select
    Accept Summary
    if you want to accept this type of LSA. Select
    Advertise Default Route
    to specify whether to include a default route LSA in advertisements to the stub area along with the associated metric value (1-255). Also, select the route type used to advertise the default LSA. Click
    Add
    in the
    External Ranges
    section and enter ranges if you want to enable or suppress advertising external routes that are learned through NSSA to other areas.
Range
Click
Add
to aggregate LSA destination addresses in the area into subnets. Enable or suppress advertising LSAs that match the subnet, and click
OK
. Repeat to add additional ranges.
Interface
Add
an interface to be included in the area and enter the following information:
  • Interface
    —Choose the interface.
  • Enable
    —Cause the OSPF interface settings to take effect.
  • Passive
    —Select if you do not want the OSPF interface to send or receive OSPF packets. Although OSPF packets are not sent or received if you choose this option, the interface is included in the LSA database.
  • Link type
    —Choose
    Broadcast
    if you want all neighbors that are accessible through the interface to be discovered automatically by multicasting OSPF hello messages, such as an Ethernet interface. Choose
    p2p
    (point-to-point) to automatically discover the neighbor. Choose
    p2mp
    (point-to-multipoint) when neighbors must be defined manually. Defining neighbors manually is allowed only for p2mp mode.
  • Metric
    —Enter the OSPF metric for this interface (0-65,535).
  • Priority
    —Enter the OSPF priority for this interface (0-255). It is the priority for the router to be elected as a designated router (DR) or as a backup DR (BDR) according to the OSPF protocol. When the value is zero, the router will not be elected as a DR or BDR.
  • Auth Profile
    —Select a previously-defined authentication profile.
  • BFD
    —To enable Bidirectional Forwarding Detection (BFD) for an OSPF peer interface (and thereby override the
    BFD
    setting for OSPF, as long as
    BFD
    is not disabled for OSPF at the virtual router level), select one of the following:
    • default
      (default BFD settings)
    • a BFD profile that you have created on the firewall
    • New BFD Profile
      to create a new BFD profile
    • Select
      None (Disable BFD)
      to disable BFD for the OSPF peer interface.
  • Hello Interval (sec)
    —Interval, in seconds, at which the OSPF process sends hello packets to its directly connected neighbors (range is 0-3600; default is 10).
  • Dead Counts
    —Number of times the hello interval can occur for a neighbor without OSPF receiving a hello packet from the neighbor, before OSPF considers that neighbor down. The
    Hello Interval
    multiplied by the
    Dead Counts
    equals the value of the dead timer (range is 3-20; default is 4).
  • Retransmit Interval (sec)
    —Length of time, in seconds, that OSPF waits to receive a link-state advertisement (LSA) from a neighbor before OSPF retransmits the LSA (range is 0-3,600; default is 10).
  • Transit Delay (sec)
    —Length of time, in seconds, that an LSA is delayed before it is sent out of an interface (range is 0-3,600; default is 1).
Interface (cont)
  • Graceful Restart Hello Delay (sec)
    —Applies to an OSPF interface when Active/Passive High Availability is configured.
    Graceful Restart Hello Delay
    is the length of time during which the firewall sends Grace LSA packets at 1-second intervals. During this time, no hello packets are sent from the restarting firewall. During the restart, the dead timer (which is the
    Hello Interval
    multiplied by the
    Dead Counts
    ) is also counting down. If the dead timer is too short, the adjacency will go down during the graceful restart because of the hello delay. Therefore, it is recommended that the dead timer be at least four times the value of the
    Graceful Restart Hello Delay
    . For example, a
    Hello Interval
    of 10 seconds and a
    Dead Counts
    of 4 yield a dead timer of 40 seconds. If the
    Graceful Restart Hello Delay
    is set to 10 seconds, that 10-second delay of hello packets is comfortably within the 40-second dead timer, so the adjacency will not time out during a graceful restart (range is 1-10; default is 10).
Virtual Link
Configure the virtual link settings to maintain or enhance backbone area connectivity. The settings must be defined for area boarder routers, and must be defined within the backbone area (0.0.0.0). Click
Add
, enter the following information for each virtual link to be included in the backbone area, and click
OK
.
  • Name
    —Enter a name for the virtual link.
  • Neighbor ID
    —Enter the router ID of the router (neighbor) on the other side of the virtual link.
  • Transit Area
    —Enter the area ID of the transit area that physically contains the virtual link.
  • Enable
    —Select to enable the virtual link.
  • Timing
    —It is recommended that you keep the default timing settings.
  • Auth Profile
    —Select a previously-defined authentication profile.

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