4-6
You must use the stub command on all the routers connected to a Stub area to configure the area with
the stub attribute.
Use the default-cost command to configure the cost of the default route advertised by an ABR to a
Stub area or NSSA.
OSPF advertises a default route in the following cases:
z When a (totally) stub area is configured, the ABR of the area automatically generates a default
route.
z After the nssa no-summary command is used on the ABR of an NSSA area, the NSSA ABR
advertises a default route into the area.
z After the nssa default-route-advertise command is configured on an NSSA ABR, the ABR
generates a default route into the NSSA regardless of whether the default route is available. If the
nssa default-route-advertise command is configured on an NSSA ASBR, only when a default
route is available on the ASBR can the router generate the default route into the attached area.
Related commands: stub, nssa.
Examples
# Set area 1 to a Stub area and the cost of the default route advertised to this Stub area to 60.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] ospf 1
[Sysname-ospf-1] area 1
[Sysname-ospf-1-area-0.0.0.1] network 20.0.0.0 0.255.255.255
[Sysname-ospf-1-area-0.0.0.1] stub
[Sysname-ospf-1-area-0.0.0.1] default-cost 60
default-route-advertise
Syntax
default-route-advertise [ always | cost value | type type-value | route-policy route-policy-name ]*
undo default-route-advertise [ always | cost | type | route-policy ]*
View
OSPF view
Parameters
always: Generates a default external route in an ASE LSA into the OSPF routing domain in the case
that the router has no default route configured. Without this keyword, you have to configure a default
route to redistribute an ASE LSA into the OSPF routing domain.
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