Routing

Hello, 

I have a question regarding the difference between commands. 

For example, i setup a network with 3 areas. 

(area 1)<->(area 0)<>(area 2)

Area 1 = nssa area with an abr going to area 0. 

On area 1's abr i want to summarize the routes from the nssa area so that when it gets to area 2 they are condenced. 

So i would think this would be the command layout. 

root@area1-R4# show protocols ospf
area 0.0.0.1 {
nssa {
default-lsa {
default-metric 10;
metric-type 2;
type-7;
}
area-range 100.0.0.0/24;
}

But when i look at the abr bordering area 0 and area 2, and a router in area 2 i still only see all the smaller routes and not the summarized routes. 

But, if i move the area-range command to be directly under area 0.0.0.1 forinstance 

root@area1-R4# show protocols ospf
area 0.0.0.1 {
nssa {
default-lsa {
default-metric 10;
metric-type 2;
type-7;
}
}
area-range 100.0.0.0/24;

I see only the summarized route in the abr facing area 2 and all the routers in area 2 as well. 

Is there something i am missing, Could anyone help explain the difference between these two commands? 

set protocols ospf area 0.0.0.1 nssa area-range 100.0.0.0/24 

and
set protocols ospf area 0.0.0.1 area-range 100.0.0.0/24 

Thanks for any help. 

set protocols ospf area 0.0.0.1 nssa area-range 100.0.0.0/24

Area range command under NSSA Stanza summarizes Type 7 LSA's before getting translated as Type 5 LSA's

set protocols ospf area 0.0.0.1 area-range 100.0.0.0/24

Area range command specified under area area-number stanza only summarizes intra-area prefixes

So the behavior that was observed in your box is as per expectation (Inter-area prefixes got summarized after

area-range is configured under area area-number stanza.

area-range under nssa stanza is meant for only filtering Type 7 (external routes) for summarization

I dont have box now with me to cite illustration on the same.

I treid it out on my lab and it worked the way you stated. I just couldn't find anything online that pointed out the difference. I think i was looking in the wrong areas online. 

I appreciate the help though, Saved me alot of digging around online. 

Please Mark Message 2 as the Accepted Solution after unmarking Message 4,as the suggested solution worked as suggested in Message 2  and the same will benefit others who are referring the same