Using the OSPF Configuration page, you can configure
the forwarding router and define the interface that connects to
the OSPF backbone.
Router ID field:
Specifies the IP address that uniquely defines the router in
the Autonomous System (AS). Selecting an existing IP address in
the unit as the OSPF Router ID inherently makes it unique.
Range: Valid IP address.
Default: Selects the highest
interface address at the time OSPF is enabled.
Interfaces field:
Specifies the interfaces available for OSPF configuration. Clicking on the
interface link takes you to the Interface page, where you
can configure the interface IP address, mask length, logical name,
protocols, and other related parameters.
Area menu:
Defines what OSPF area an interface belongs to. An OSPF area
is a logical group of routers acting as an independent entity.
Routes are exchanged between areas using an area border
router. Each OSPF router must be configured into at least one OSPF
area. If more than one area is configured, at least one must be
the backbone. This would then be a border router.
Options: backbone, none.
Range: All areas currently
configured.
Default: None.
Add New OSPF Area field:
Specifies the IP address for a new OSPF area. Clicking on the
interface link takes you to the Interface page, where you
can configure the interface IP address, mask length, logical name,
protocols, and other parameters. The area ID of 0.0.0.0 is
reserved for the backbone. The IP network number of a subnetted
network may be used as the area ID.
Range: 32-bit number.
Stub Area field:
Specifies an area in which there are no Autonomous System External (ASE)
routes. This applies only when a new area is created. ASE routes
are routes to destinations external to the AS.
Options: Yes/No
Default: No
Authentication field:
Guarantees that routing information is imported only from trusted routers. Digital uses a simple, standardized authentication key of up to 8 characters. This applies only when a new area is created. Each interface in the area must use the
same authentication scheme.
Options: none/simple
Default: none.
Network Prefix for new Area Network field:
Defines the route summary that will be advertised for this area.
This applies only when a new area is created. You may
need to define multiple address ranges if networks are not
contiguous.
Range: Valid IP network
address range.
Mask length field:
Specifies the mask length for the area, used in conjunction with the network
prefix to define the network range. This applies only when a
new area is created.
Range: Valid IP subnet mask
(0-32).
Cost for Default Stub Area Route field:
Injects a default route into the area with the specified cost.
This field displays only if a new area is defined as a stub area.
Range: 1-65535
Default: None
Totally Stubby Area field:
Specifies an area in which there are no ASE routes or Summary routes.
This field displays only if a new area is defined as a stub area.
Options: Yes/No
Default: No
Hello Interval field:
Specifies the length of time, in seconds, between Hello packets that the
router sends on the interface. For a given link, this field must be
the same on all routers.
Range: Positive number
of seconds.
Default: 10
Dead Interval field:
Specifies the number of seconds not hearing a router's Hello packets
before the router's neighbors declare it down. Typically the
value of this field should be four times the size of the
Hello Interval field. For a given link, this field must be
the same on all routers.
Range: Positive number
of seconds.
Default: 40
OSPF Cost field:
Specifies the weight of a given path in a route. The higher the
cost, the less preferred the link. You may explicitly override this
in export policy.
Example: To use one
interface over another for routing paths, give one a higher cost.
Range: 1-65535
Default: 1
Election Priority field:
Specifies the priority for becoming the designated router on this
interface. When two routers attached to a network both attempt
to become designated router, the one with the highest priority
wins. This field displays only when OSPF is set on a shared
media interface (Ethernet, FDDI). A router with priority 0 cannot
become the designated router.
Range: 0-255
Default: 1
Authentication Key field:
Specifies an authentication key of up to eight characters. This field is
displayed if Simple authentication is selected for an
area. Each interface in the area must use this same
authentication scheme, although it may use a
different authentication key.
Range: 8-character
alphanumeric string.
Network Prefix field:
Enables/Disables this network prefix. This field displays only after you enter a network prefix in the Network Prefix for new Area Network field and click the Apply button.
Options: on/off
Default: on
Restrict field:
If the Restrict field is on, the summary of
network Link State Advertisements (LSAs) is not advertised. This field displays only after you enter
a network prefix in the Network Prefix for new Area Network field and click the Apply button.
Options: on/off
Default: off
Apply button:
Applies the parameters on the current page to the running system.