To configure a backbone and a normal area with an ID of "1" (0.0.0.1) on a routing switch:
switch(ospf)# area backbone
switch(ospf)# area 1
Configuring a stub or NSSA area
Syntax:
area
ospf-area-id
stub 0-16777215 [no-summary] area
ospf-area-id
nssa 0-16777215
[no-summary] [metric-type [type1 | type2]] No area
ospf-area-id
After using
router ospf
to globally enable OSPF and enter the global OSPF context, execute this command to
assign the routing switch to a stub area or NSSA. (Does not apply to backbone and normal OSPF area ABRs.)
The
no
form of the command removes the routing switch from the specified area.
Default: No areas; Range: 1 to 16 areas (of all types)
ospf-area-id
Same area ID as in
Configuring an OSPF backbone or normal area
on page 199, except you cannot
assign a backbone area number (
0
or
0.0.0.0
) to a stub or NSSA area.
[stub | nssa]
Designates the area identified by
ospf-area-id
as a stub area or NSSA.
0-16777215
If the routing switch is used as an ABR for the designated area, assigns the cost of the default route (to the
backbone) that is injected into the area.
NOTE:
If the routing switch is not an ABR for the stub area or NSSA, the above cost setting is still
required by the CLI, but is not used.
In the default configuration, a routing switch acting as an ABR for a stub area or NSSA injects type-3 summary
routes into the area. For an NSSA, the routing switch also injects a type-7 default route into the area.
[no-summary]
Where the routing switch is an ABR for a stub area or an NSSA, this option reduces the amount of link-state
advertisement (LSA) traffic entering the area from the backbone by replacing the injection of type-3 summary
routes with injection of a type-3 default summary route.
For NSSAs, this command also disables injection of the type-7 default external route from the backbone into
the area (included in the
metric-type
operation described below.)
Default: Disabled
on page 252,
on page 253, and
Replacing type-3summary LSAs and type-7 default external LSAs with a type-3 default route LSA
on
page 254.
[metric-type [type1 | type2]]
Used in NSSA ABRs only.
Enables injection of the type-7 default external route and type-3 summary routes into the area instead of a
type 3 default route. Also specifies the type of internal cost metric to include in type-7 LSAs advertised for
redistribution of external routes in the NSSA. (The redistribution—or external—cost metric is a global setting
on the routing switch set by the
default-metric
command.)
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Aruba 3810 / 5400R Multicast and Routing Guide for ArubaOS-
Switch 16.08
