3com 5500-ei pwr Guia De Referência

 

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 

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. 

# 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 

[ always | cost value | type type-value | route-policy route-policy-name ]* 

[ always | cost | type | route-policy ]* 

OSPF view 

: 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.