Routing

hello, dear Juniper

 

there are 3 routers in area1

 

r1        r2           r3    

------area 1---------

         |

       r4

         |

  -----area 0--------

 

there is a static route 0/0 in r3, I want to export it to ospf ,and only let r1 to learn it .

 

is there a way to achieve this?

AFAIK, we cannot stop that route entering the OSPF database , it will be there on call routers. We may use Import policy and stop getting that route active on route table on routers except r1.

so,in order to achieve this, each router should have a import policy ?

Unfortunately, yes.

hmm.ok

 

btw: is it possible to restrict this 0/0 route in area 1 and area0 , not to other areas attached to area0

You may use the "restrict" key-word to keep the routes in just one area. http://www.juniper.net/techpubs/en_US/junos14.1/topics/topic-map/ospf-route-summarization.html

need the area as NSSA to configure restrict?

I don't think so, you may try below config set protocols ospf area 0.0.0.3 area-range 0.0.0.0/0 exact restrict

hmm, in my case.:

I want to export 0/0  to r3 ospf, but only keep this 0/0 in area 1

 

 

set protocols ospf area 0.0.0.3 area-range 0.0.0.0/0 exact restrict:this seems to redistribute a 0/0 to area 0.0.0.3?

I used "area 0.0.0.3" by mistake. you may use below.

 

set protocols ospf area 0.0.0.1 area-range 0.0.0.0/0 exact restrict

ha,np

I am trying it

there is one thing confuse me:

 

area-range can't summarize LSA 5,but area-range restrict can restrict LSA5

0/0 is an external route LSA 5

In your case you don't want to summarize, you just need to restrict the routes , isn't ?

hi,Suraj

yes

 

r3 is a ospf router in area1. I export 0/0 in this r3(LSA5).

 

now I only want this 0/0 only exist in area1,

 

It seems area range is not for LSA5

Hi, 

 

the area-range command doesn't work for type-5 LSAs on the ABR. You need to convert area 1 to NSSA and use the 

 

set protocols ospf area 0.0.0.1 nssa area-range 0.0.0.0/0 restrict

 

Cheers,

Carsten