Compatible Systems 5.4 Manuale Utente
Chapter 15 - OSPF
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OSPF Area Name
The OSPF Area Name is an integer or IP address. If more than one area is
configured within an AS, then one of these areas has to be area 0, which is the
backbone. The backbone has to be physically connected to all other areas. It
is recommended that you start with area 0 and then expand into other areas.
configured within an AS, then one of these areas has to be area 0, which is the
backbone. The backbone has to be physically connected to all other areas. It
is recommended that you start with area 0 and then expand into other areas.
v Note: The only exception to starting with area 0 is with virtual links, which
are explained in the following section.
are explained in the following section.
OSPF Authentication Type
This pull-down box specifies whether the router will perform authentication
of Link State Advertisements received from other routers.
of Link State Advertisements received from other routers.
•
If Simple is selected, you must specify an authentication key for any
interface which is associated with this area.
interface which is associated with this area.
•
If None is selected, no authentication will be done on Link State Adver-
tisements.
tisements.
Authentication Key
This sets the OSPF packet authentication key. The authentication key must
match for each router connected to the interface and belonging to the area.
The authentication key must be between one and eight alphanumeric charac-
ters.
match for each router connected to the interface and belonging to the area.
The authentication key must be between one and eight alphanumeric charac-
ters.
Enable Stub Area
This checkbox sets whether this area will function as a stub area. A stub area
is an area which cannot receive external advertisements, which means RIP or
static routes will not be redistributed into this area.
is an area which cannot receive external advertisements, which means RIP or
static routes will not be redistributed into this area.
If routing from a stub area to external routes (i.e., non-OSPF routes) is
needed, a default route must be set. A stub area may not be a transit area for
a virtual link.
needed, a default route must be set. A stub area may not be a transit area for
a virtual link.
v Note: The backbone area (area 0) cannot be designated as a stub area.
Stub Default Cost
Stub Default Cost
This value sets the cost of the default route which will be used by routers
within the stub area to route to external destinations. The value must be a
number between 0 and 65,535.
within the stub area to route to external destinations. The value must be a
number between 0 and 65,535.
Net Range
The Net Range can be used to consolidate routing information at area bound-
aries, or to hide routing information from routers outside the area. Net Ranges
only apply to inter-area networks. If all the routers are in one area, any defined
Net Ranges will not be used by the router. You may specify several different
Net Ranges.
aries, or to hide routing information from routers outside the area. Net Ranges
only apply to inter-area networks. If all the routers are in one area, any defined
Net Ranges will not be used by the router. You may specify several different
Net Ranges.