[quagga-users 14610] Routing for LSA 7 in NSSA not working as expected

Hi all,

I am testing a setup with 3 routers in an NSSA:

router A, router B, router C, connected in triangle. Router A
redistributes the connected 10.10.0.0/24 network.
On router B, I see:
10.10.0.0/24 via 192.168.250.10 dev eth1  proto zebra  metric 30

On router C however, I see:
10.10.0.0/24  proto zebra  metric 40
        nexthop via 192.168.251.11  dev eth1 weight 1
        nexthop via 10.200.0.10  dev eth2 weight 1

I do not want the next hop 192.168.251.11 and I do not understand why
it shows up with the same metric as it is one extra hop.

If I make the area a normal OSPF area instead of an NSSA, all works
fine. Please find the configurations below, can someone shed some
light on this please?

Thanks in advance!
Erwin


IP configuration:
Router A:
eth1 = 192.168.250.10/24
eth2 = 10.200.0.10/24
eth3 = 10.10.0.10/24

Router B:
eth0 = 10.0.2.15/24
eth1 = 192.168.250.11/24
eth2 = 192.168.251.11/24

Router C:
eth1 = 192.168.250.12/24
eth2 = 10.200.0.12/24
eth3 = 10.12.0.12/24

Router A:
ip prefix-list into-ospf seq 5 permit 10.10.0.0/16 le 32
ip prefix-list into-ospf seq 10 deny 0.0.0.0/0 le 32
route-map connected-to-ospf permit 5
 match ip address prefix-list into-ospf
router ospf
  network 192.168.0.0/16 area 1
  network 10.200.0.0/24 area 1
  router-id 10.200.0.10
  redistribute connected route-map connected-to-ospf metric-type 1
  log-adjacency-changes
  area 1 nssa


Router B:
router ospf
  network 192.168.0.0/16 area 1
  network 10.200.0.0/24 area 1
  network 10.0.2.0/23 area 0
  router-id 192.168.251.11
  area 1 nssa


Router C:
router ospf
  network 192.168.0.0/16 area 1
  network 10.200.0.0/24 area 1
  router-id 10.200.0.12
  redistribute connected route-map connected-to-ospf metric-type 1
  area 1 nssa