area range
(OSPFv2)
Syntax
area
{
A.B.C.D
|
decimal
}
range
E.F.G.H
I.J.K.L
advertise
[
cost
cost_value
]
area
{
A.B.C.D
|
decimal
}
range
E.F.G.H
I.J.K.L
not-advertise
[
cost
cost_value
]
area
{
A.B.C.D
|
decimal
}
range
E.F.G.H
I.J.K.L
cost
cost_value
Parameters
-
A.B.C.D
- Area address in IP address format.
-
decimal
- Area address in decimal format.
-
E.F.G.H
I.J.K.L
- Specifies the IP address and mask portion of
the range. All network addresses that match this network are summarized in
one route and advertised by the ABR.
-
advertise
- Sets the address range status to
advertise and generates a Type 3 summary LSA.
-
cost
cost_value
- Sets the cost value for the area range. This value is used as the generated summary LSA cost. The range for
cost_value is 1 to 6777214. If this value is not specified, the cost value is the default range metric calculation for the generated summary LSA cost.
-
not-advertise
- Sets the address range status to
DoNotAdvertise; the Type 3 LSA is suppressed, and the component networks
remain hidden from other networks. This setting temporarily pauses the route
summary from the area.
Modes
OSPF router configuration mode
OSPF router VRF configuration mode
Usage Guidelines
Use this command only on ABRs to specify a
route summary for an existing area. The result is that one summary route is
advertised to other areas by the ABR, in the form of a Type 3 LSA. Routing
information is condensed at area boundaries and external to the area, and only one
route is advertised for each address range.
For example, use this command is if you have
many small networks advertised from area 0 to any other area, or from any
non-backbone area into the backbone. This command gives you a summary route instead
of many smaller routes. In an area, the OSPF database on each router must be an
exact copy of the databases of the other routers. This means that no summary is
allowed in the area.
The
no form of the command disables the specification of range parameters on an ABR.
Examples
The following example advertises to Area 3 all
the addresses on the network 10.1.1.0 255.255.255.0 in the ABR you are signed
into.
device# configure terminal
device(config)# router ospf
device(config-router-ospf-vrf-default-vrf)# area 3 range 10.1.1.0 255.255.255.0 advertise
