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New Member

Not able to get nssa routes into routing table

Hi all,

I am having the following need:

Consider there three routers

R1------area0-----R2-----area1-----R3

Area1 is nsssa.

In R3, I have the following configs:

router ospf 100

redistribute static

area 1 nssa

network 10.1.1.0/24 area 1

ip route 150.1.1.0/24 10.1.1.10 250

ip route 160.1.1.0/24 10.1.1.10 250

where 10.1.1.10 is R2's address .

I redistributed static routes into ospf (changed to metric of static routes so that nssa routes can get preferrence), in 'sh ip ospf database', I can see the nsa routes:

Type-7 AS External Link States (Area 0.0.0.1)

Link ID ADV Router Age Seq# Checksum Tag

150.1.1.0 101.101.101.20 1713 0x80000003 0x2AB0 0

160.1.1.0 101.101.101.20 1713 0x80000003 0xA729 0

But , in 'show ip route' , I can see only static routes

S 150.1.1.0 [250/0] via 10.1.1.10, 00:29:59, Gi0/0/3

160.1.0.0/24 is subnetted, 1 subnets

S 160.1.1.0 [250/0] via 10.1.1.10, 00:29:59, Gi0/0/3

Kindly, can some one explain on it. Isn't it possible to get nssa routes in the routing table ?

Thanks,

Vijaybabu

4 REPLIES
New Member

Re: Not able to get nssa routes into routing table

Vijaybabu,

What does R2's configuration look like? Can you post full configs?

Does R2 also have area 1 configured as nssa?

Re: Not able to get nssa routes into routing table

But that doesn't look like a problem - your R3 has static route to 150.1.1.0/24 with admin distance 250, it redistributes the route into OSPF and that's it. If static route is removed from the routing table, there will be nothing to redistribute unless there is another static route to the same destination. This appears as nothing is wrong with your setup so far. Which route did you expect to see in the routing table?

New Member

Re: Not able to get nssa routes into routing table

Hi ,

As I redistributed static routes into OSPF with AD 250, I expect OSPF nssa routes to be in routing table.

Thanks,

Vijaybabu

Hall of Fame Super Silver

Re: Not able to get nssa routes into routing table

Vijaybabu has also posted this question in the LAN Switching and Routing forum where it has received several responses. The essence of the explanation is that whenever a router redistributes into a protocol (like redistributing static into OSPF) the routes always appear in the routing table of that router in their original protocol (in this case static).

No matter what Vijaybabu does with administrative distance of the static route it will be a static route in the routing table of that router. To see that route as an OSPF route it is necessary to look in the routing table of one of the neighbors.

HTH

Rick

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