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Disappearing route posted 11/26/2003
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               P2M --R4
                 /
    area 0  /     VL  area 1        area 2
      R1--R2 ---- P2M -R5 --- P2P --R7
               \
                 \
               P2P--R6

I have this config that I can't seem to make sense of.. Area 0 is on hdlc
between r1 and r2. Area 1 is between a point to multipoint link on R2 to the
ser0 of r4 and r5. A p2p connection between r6 and r2. There is a virtual link
using r2 to r5 as the transit area. The serial1 is connected via ppp to the s0
of r7 in area 2. I am not using any authentication. Now here's the strange
part. R7 sees all the routes, can ping all of them but the multipoint int on
r2, (coming up as a host route with p2m). R2 does not see routes injected via
R7 at all, but, they are showing up in the ospf database, just not in the
route table. All other routers have full connectivity. R7 can ping r5, and all
other interfaces, including those that have to pass through the hub to reach
the end spokes. R2 in turn can ping everything up to r5. A trace shows r7 gets
to r5 then the route is blackholed. Debugs show only a normal adjacency
forming between routers involved. I think it might have something to do with
the VL. or a route summary. not sure, but one thing I wonder is how a route
can show up in the ospf database and not be installed in the route table..
here's my configs..

R2
O    205.1.1.0/24 [110/65] via 12.1.1.5, 00:31:22, Serial0.1
O    206.1.1.0/24 [110/65] via 13.1.1.2, 00:31:22, Serial0.2
     172.18.0.0/18 is subnetted, 4 subnets
O       172.18.128.0 [110/65] via 12.1.1.5, 00:31:22, Serial0.1
O       172.18.192.0 [110/65] via 12.1.1.5, 00:31:22, Serial0.1
O       172.18.0.0 [110/65] via 12.1.1.5, 00:31:22, Serial0.1
O       172.18.64.0 [110/65] via 12.1.1.5, 00:31:22, Serial0.1
C    202.1.1.0/24 is directly connected, Loopback0
     12.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
O       12.1.1.4/32 [110/64] via 12.1.1.4, 00:31:22, Serial0.1
O       12.1.1.5/32 [110/64] via 12.1.1.5, 00:31:22, Serial0.1
C       12.1.1.0/24 is directly connected, Serial0.1
     13.0.0.0/30 is subnetted, 1 subnets
C       13.1.1.0 is directly connected, Serial0.2
     150.50.0.0/16 is variably subnetted, 4 subnets, 2 masks
C       150.50.1.0/24 is directly connected, Serial1
C       150.50.9.0/24 is directly connected, Dialer0
C       150.50.9.2/32 is directly connected, Dialer0
C       150.50.17.0/24 is directly connected, Ethernet0

interface Loopback0
 ip address 202.1.1.1 255.255.255.0
interface Serial0.1 multipoint
 ip address 12.1.1.2 255.255.255.0
 ip ospf network point-to-multipoint
 frame-relay map ip 12.1.1.4 101 broadcast
 frame-relay map ip 12.1.1.5 102 broadcast
!
interface Serial0.2 point-to-point
 ip address 13.1.1.1 255.255.255.252
 frame-relay interface-dlci 103
router ospf 100
 router-id 202.1.1.1
 log-adjacency-changes
 area 1 virtual-link 205.1.1.1
 passive-interface default
 no passive-interface Serial0.1
 no passive-interface Serial0.2
 no passive-interface Serial1
 network 12.1.1.0 0.0.0.255 area 1
 network 13.1.1.0 0.0.0.3 area 1
 network 150.50.1.0 0.0.0.255 area 0
r5

C    205.1.1.0/24 is directly connected, Loopback0
O    207.1.1.0/24 [110/65] via 150.50.18.7, 00:32:48, Serial1
O    206.1.1.0/24 [110/129] via 12.1.1.2, 00:32:48, Serial0
     172.16.0.0/24 is subnetted, 1 subnets
C       172.16.1.0 is directly connected, TokenRing0
     172.18.0.0/16 is variably subnetted, 5 subnets, 2 masks
C       172.18.128.0/18 is directly connected, Loopback3
C       172.18.192.0/18 is directly connected, Loopback4
S       172.18.0.0/16 is directly connected, Null0
C       172.18.0.0/18 is directly connected, Loopback1
C       172.18.64.0/18 is directly connected, Loopback2
     12.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
O       12.1.1.4/32 [110/64] via 12.1.1.4, 00:32:48, Serial0
C       12.1.1.0/24 is directly connected, Serial0
O       12.1.1.2/32 [110/64] via 12.1.1.2, 00:32:50, Serial0
     13.0.0.0/30 is subnetted, 1 subnets
O       13.1.1.0 [110/128] via 12.1.1.2, 00:32:50, Serial0
     150.50.0.0/16 is variably subnetted, 5 subnets, 2 masks
O IA    150.50.1.0/24 [110/192] via 12.1.1.2, 00:32:50, Serial0
C       150.50.9.1/32 is directly connected, Dialer0
C       150.50.9.0/24 is directly connected, Dialer0
C       150.50.18.7/32 is directly connected, Serial1
C       150.50.18.0/24 is directly connected, Serial1

interface Loopback0
 ip address 205.1.1.1 255.255.255.0
 ip ospf network point-to-point
!
interface Loopback1
 ip address 172.18.0.1 255.255.192.0
 ip ospf network point-to-point
!
interface Loopback2
 ip address 172.18.64.1 255.255.192.0
 ip ospf network point-to-point
!
interface Loopback3
 ip address 172.18.128.1 255.255.192.0
 ip ospf network point-to-point
!
interface Loopback4
 ip address 172.18.224.1 255.255.192.0
 ip ospf network point-to-point

interface Serial0
 ip address 12.1.1.5 255.255.255.0
 encapsulation frame-relay
 ip ospf network point-to-multipoint
 no fair-queue
 frame-relay map ip 12.1.1.2 301 broadcast

router ospf 100
 log-adjacency-changes
 area 1 range 172.18.0.0 255.255.0.0
 area 1 virtual-link 202.1.1.1
 passive-interface default
 no passive-interface Loopback0
 no passive-interface Serial0
 no passive-interface Serial1
 network 12.1.1.0 0.0.0.255 area 1
 network 150.50.18.0 0.0.0.255 area 2
 network 172.18.0.0 0.0.63.255 area 1
 network 172.18.64.0 0.0.63.255 area 1
 network 172.18.128.0 0.0.63.255 area 1
 network 172.18.192.0 0.0.63.255 area 1
 network 205.1.1.0 0.0.0.255 area 1
!
ip classless
ip route 172.18.0.0 255.255.0.0 Null0
ip http server

r7

O IA 205.1.1.0/24 [110/65] via 150.50.18.5, 00:33:33, Serial0
C    207.1.1.0/24 is directly connected, Loopback0
O IA 206.1.1.0/24 [110/193] via 150.50.18.5, 00:33:33, Serial0
O IA 172.18.0.0/16 [110/65] via 150.50.18.5, 00:33:33, Serial0
     12.0.0.0/32 is subnetted, 3 subnets
O IA    12.1.1.4 [110/128] via 150.50.18.5, 00:33:33, Serial0
O IA    12.1.1.5 [110/64] via 150.50.18.5, 00:33:33, Serial0
O IA    12.1.1.2 [110/128] via 150.50.18.5, 00:33:34, Serial0
     13.0.0.0/30 is subnetted, 1 subnets
O IA    13.1.1.0 [110/192] via 150.50.18.5, 00:33:34, Serial0
     150.50.0.0/16 is variably subnetted, 4 subnets, 2 masks
C       150.50.5.0/24 is directly connected, Serial1
C       150.50.18.5/32 is directly connected, Serial0
C       150.50.17.0/24 is directly connected, Ethernet0
C       150.50.18.0/24 is directly connected, Serial0

interface Loopback0
 ip address 207.1.1.1 255.255.255.0
 no ip directed-broadcast
 ip ospf network point-to-point

interface Serial0
 ip address 150.50.18.7 255.255.255.0
 no ip directed-broadcast
 encapsulation ppp
 no fair-queue
!
interface Serial1
 ip address 150.50.5.68 255.255.255.0
 no ip directed-broadcast
!
interface Async1
 no ip address
 no ip directed-broadcast
 shutdown
!
router ospf 100
 passive-interface default
 no passive-interface Loopback0
 no passive-interface Serial0
 network 150.50.18.0 0.0.0.255 area 2
 network 207.1.1.0 0.0.0.255 area 2