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Community Member

Ospf default route !

I would like to know that suppose i have an ABR that is connected to area 1 and 0. Area 1 is normal, i want to advertise default route from this ABR to only area 1 and not area 0, can you kindly tell me the way by which i can achieve this ?

i dont think default information originate gives me any such option, so what you guys think ?

4 REPLIES
Cisco Employee

Re: Ospf default route !

HI rox,

If you dont have any limitation, you can configure Area 1 as Stub or NSSA and a default route will be advertised by ABR. If you configure "default-information originate", a type 5 LSA will be generated and so you cannot filter it to a particular area.

HTH,

Nagendra

Community Member

Re: Ospf default route !

ok taking it as a final word :), can u tell me that we can make virtual link in ospf via two methods,

1) virtual link command

2) gre tunnel

is there also a third way of doing it ??

Cisco Employee

Re: Ospf default route !

Rephrasing,

When an ABR is not directly connected to backbone area (Area 0), we can do any of the following :

1. Configure a virtual link using "area virtual-link "

2. If the area via which the virtual-link is to be built is STUB, we use GRE tunnel between ABR and configure the tunnel in AREA 0.

HTH,

Nagendra

Community Member

Re: Ospf default route !

Thanks Nagendra, but what about the 3rd method of building this virtual link ?

any idea ?

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