- Area ID
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A 32-bit number identifying the area. Area
0.0.0.0 is reserved for the backbone.
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- List of area address ranges
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List of area address ranges belonging to the area.
Each address range is specified by an [address,mask] pair and a
status indication of either Advertise or DoNotAdvertise.
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- Associated router interfaces
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Router's interfaces connecting to the area. A router
interface belongs to one and only one area. For the backbone
area this list includes all the virtual links.
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- List of router-LSAs
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A router-LSA is generated by each router in the
area. It describes the state of the router's interfaces to the area.
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- List of network-LSAs
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One network-LSA is generated for each
transit broadcast and NBMA network in the area. A
network-LSA describes the set of routers currently connected to
the network.
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- List of summary-LSAs
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Summary-LSAs originate from the area's area
border routers. They describe routes to destination internal to the
AS, yet external to the area.
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- Shortest-path Tree
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The shortest-path tree for the area, with this
router itself as root.
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- Transit Capability
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This parameter indicates whether the area can carry
data traffic that neither originates nor terminates in the area
itself.
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- External Routing Capability
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Whether AS-external-LSAs will be flooded
into/throughout the area. If AS-external-LSAs are excluded from
the area, the area is called a "stub". Within stub areas,
routing to AS external destinations will be based solely on a
default summary route.
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- Stub Default Cost
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If the area has been configured as a stub area, and
the router itself is an area border router, then the
StubDefaultCost indicates the cost of the default summary-LSA
that the router advertise into the area. |
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