ospflab 2

i wrote flab...

build it... you know you want to... make the clock rate 64000

here's the skinny...

set up r1-r2 ints and lo's in area 0, of course...

then ip ospf netw point-to-p to each lo int...

without this they will be stubs in the output of sh ip ospf int... for an excellent demonstration of this, go here...

http://www.rogerperkin.co.uk/ccie/index.php/ospf/ccie-troubleshooting-ospf-hello-mismatch/

just one of those craz-azy ospf kinda things... without the point-to-point statement it shows up as a host /32, with it, it shows up as a network or /24

r2#sh ip route

(without point-to-point on the loopback of r1)

      10.0.0.0/8 is variably subnetted, 7 subnets, 2 masks
O        10.1.1.1/32 [110/65] via 10.1.12.1, 00:01:56, Serial1/1
C        10.1.2.0/24 is directly connected, Loopback2
L        10.1.2.1/32 is directly connected, Loopback2
C        10.1.12.0/24 is directly connected, Serial1/1
L        10.1.12.2/32 is directly connected, Serial1/1
C        10.1.23.0/24 is directly connected, Serial1/3
L        10.1.23.2/32 is directly connected, Serial1/3

r2#sh ip route

(with point-to-point on the loopback of r1)






      10.0.0.0/8 is variably subnetted, 7 subnets, 2 masks
O        10.1.1.0/24 [110/65] via 10.1.12.1, 00:00:05, Serial1/1
C        10.1.2.0/24 is directly connected, Loopback2
L        10.1.2.1/32 is directly connected, Loopback2
C        10.1.12.0/24 is directly connected, Serial1/1
L        10.1.12.2/32 is directly connected, Serial1/1
C        10.1.23.0/24 is directly connected, Serial1/3
L        10.1.23.2/32 is directly connected, Serial1/3
r2#


verify the neighbor states with ip ospf neigh and the presence of loopbacks in sh ip route...

add the link from r2 to r3 and the point-to-point statement on lo3 of r3 only...

r2#sh ip ospf neigh

Neighbor ID     Pri   State           Dead Time   Address         Interface
10.1.1.1          0   FULL/  -        00:00:37    10.1.12.1       Serial1/1
10.1.3.1          0   FULL/  -        00:00:33    10.1.23.3       Serial1/3
r2#

note ia routes on r1  but not on r2...

r1#sh ip route ospf

      10.0.0.0/8 is variably subnetted, 7 subnets, 2 masks
O        10.1.2.0/24 [110/65] via 10.1.12.2, 00:10:52, Serial1/1
O IA     10.1.3.0/24 [110/129] via 10.1.12.2, 00:10:52, Serial1/1
O IA     10.1.23.0/24 [110/128] via 10.1.12.2, 00:10:52, Serial1/1

r2#sh ip route ospf

      10.0.0.0/8 is variably subnetted, 8 subnets, 2 masks
O        10.1.1.0/24 [110/65] via 10.1.12.1, 00:07:30, Serial1/1
O        10.1.3.0/24 [110/65] via 10.1.23.3, 00:07:30, Serial1/3
r2#

...because it is an abr for each area...

r1#tclsh
r1(tcl)#foreach address {
+>(tcl)#10.1.1.1
+>(tcl)#10.1.2.1
+>(tcl)#10.1.3.1
+>(tcl)#10.1.12.1
+>(tcl)#10.1.12.2
+>(tcl)#10.1.23.2
+>(tcl)#10.1.23.3
+>(tcl)#172.20.200.1
+>(tcl)#} {
+>(tcl)#ping $address }
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.2.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/5/12 ms
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.3.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/9/12 ms
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.12.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/8/8 ms
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.12.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/4 ms
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.23.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/8 ms
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.23.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/7/12 ms
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.20.200.1, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
r1(tcl)#



note the abject failure of lo20 for being a non-hacker by not participating in ospf...
bad loopback, bad...

give r2 and r3 a case of the stubs...

r2(config)#router ospf 1
r2(config-router)#area 23 stub
r2(config-router)#
*Aug  5 13:06:25: %OSPF-5-ADJCHG: Process 1, Nbr 10.1.3.1 on Serial1/3 from FULL to DOWN, Neighbor Down: Adjacency forced to reset
r2(config-router)#
*Aug  5 13:07:02: %OSPF-5-ADJCHG: Process 1, Nbr 10.1.3.1 on Serial1/3 from LOADING to FULL, Loading Done
r2(config-router)#

r3(config)#router ospf 1
r3(config-router)#area 23 stub
r3(config-router)#
*Aug  5 13:06:56: %OSPF-5-ADJCHG: Process 1, Nbr 10.1.2.1 on Serial1/3 from FULL to DOWN, Neighbor Down: Adjacency forced to reset
r3(config-router)#
*Aug  5 13:07:01: %OSPF-5-ADJCHG: Process 1, Nbr 10.1.2.1 on Serial1/3 from LOADING to FULL, Loading Done
r3(config-router)#

whoops...

r3#sh ip route ospf

Gateway of last resort is 10.1.23.2 to network 0.0.0.0

O*IA  0.0.0.0/0 [110/65] via 10.1.23.2, 00:04:01, Serial1/3
      10.0.0.0/8 is variably subnetted, 7 subnets, 2 masks
O IA     10.1.1.0/24 [110/129] via 10.1.23.2, 00:04:01, Serial1/3
O IA     10.1.2.0/24 [110/65] via 10.1.23.2, 00:04:01, Serial1/3
O IA     10.1.12.0/24 [110/128] via 10.1.23.2, 00:04:01, Serial1/3
r3#

a stub router cannot receive external routes... only default and inter-area... the horror of it all...

look at the area types...

r2#sh ip ospf
 Routing Process "ospf 1" with ID 10.1.2.1
 Start time: 00:00:11.876, Time elapsed: 02:44:16.412
 Supports only single TOS(TOS0) routes
 Supports opaque LSA
 Supports Link-local Signaling (LLS)
 Supports area transit capability
 Supports NSSA (compatible with RFC 3101)
 Event-log enabled, Maximum number of events: 1000, Mode: cyclic
 It is an area border router
 Router is not originating router-LSAs with maximum metric
 Initial SPF schedule delay 5000 msecs
 Minimum hold time between two consecutive SPFs 10000 msecs
 Maximum wait time between two consecutive SPFs 10000 msecs
 Incremental-SPF disabled
 Minimum LSA interval 5 secs
 Minimum LSA arrival 1000 msecs
 LSA group pacing timer 240 secs
 Interface flood pacing timer 33 msecs
 Retransmission pacing timer 66 msecs
 Number of external LSA 0. Checksum Sum 0x000000
 Number of opaque AS LSA 0. Checksum Sum 0x000000
 Number of DCbitless external and opaque AS LSA 0
 Number of DoNotAge external and opaque AS LSA 0
 Number of areas in this router is 2. 1 normal 1 stub 0 nssa
 Number of areas transit capable is 0
 External flood list length 0
 IETF NSF helper support enabled
 Cisco NSF helper support enabled
 Reference bandwidth unit is 100 mbps
    Area BACKBONE(0)
        Number of interfaces in this area is 2
    Area has no authentication
    SPF algorithm last executed 00:09:15.640 ago
    SPF algorithm executed 6 times
    Area ranges are
    Number of LSA 4. Checksum Sum 0x019A61
    Number of opaque link LSA 0. Checksum Sum 0x000000
    Number of DCbitless LSA 0
    Number of indication LSA 0
    Number of DoNotAge LSA 0
    Flood list length 0
    Area 23
        Number of interfaces in this area is 1
        It is a stub area
        Generates stub default route with cost 1
    Area has no authentication
        SPF algorithm last executed 00:08:34.176 ago
    SPF algorithm executed 6 times
    Area ranges are
    Number of LSA 6. Checksum Sum 0x01B58A
    Number of opaque link LSA 0. Checksum Sum 0x000000
    Number of DCbitless LSA 0
    Number of indication LSA 0
    Number of DoNotAge LSA 0
    Flood list length 0

from: http://users.lmi.net/canepa/subdir/ospf_fundamentals.html

OSPF Areas Types

Normal Areas: These areas can either be standard areas or transit (backbone) areas. Standard areas are defined as areas that can accept intra-area, inter-area and external routes. The backbone area is the central area to which all other areas in OSPF connect.

Note: Intra-area routes refer to updates that are passed within the area. Inter-area routes refer to updates that are passed between areas. External routes refer to updates passed from another routing protocol into the OSPF domain by the Autonomous System Border Router (ASBR).

Stub Areas: These areas do not accept routes belonging to external autonomous systems (AS); however, these areas have inter-area and intra-area routes. In order to reach the outside networks, the routers in the stub area use a default route which is injected into the area by the Area Border Router (ABR). A stub area is typically configured in situations where the branch office need not know about all the routes to every other office, instead it could use a default route to the central office and get to other places from there. Hence the memory requirements of the leaf node routers is reduced, and so is the size of the OSPF database.

To define an area as a stub area, use the OSPF router configuration command, area

stub

next 

Totally Stub Areas: These areas do not allow routes other than intra-area and the default routes to be propagated within the area. The ABR injects a default route into the area and all the routers belonging to this area use the default route to send any traffic outside the area.

To define a totally stub area, use the OSPF router configuration command, area

stub no-summary, on the ABR. 

r3#sh ip route ospf

Gateway of last resort is 10.1.23.2 to network 0.0.0.0

O*IA  0.0.0.0/0 [110/65] via 10.1.23.2, 00:19:58, Serial1/3
      10.0.0.0/8 is variably subnetted, 7 subnets, 2 masks
O IA     10.1.1.0/24 [110/129] via 10.1.23.2, 00:19:58, Serial1/3
O IA     10.1.2.0/24 [110/65] via 10.1.23.2, 00:19:58, Serial1/3
O IA     10.1.12.0/24 [110/128] via 10.1.23.2, 00:19:58, Serial1/3

r3#sh ip ospf data

            OSPF Router with ID (10.1.3.1) (Process ID 1)

        Router Link States (Area 23)

Link ID         ADV Router      Age         Seq#       Checksum Link count
10.1.2.1        10.1.2.1        1297        0x80000007 0x00240A 2
10.1.3.1        10.1.3.1        1296        0x80000007 0x0011FC 3

        Summary Net Link States (Area 23)

Link ID         ADV Router      Age         Seq#       Checksum
0.0.0.0         10.1.2.1        1333        0x80000001 0x003BF4
10.1.1.0        10.1.2.1        862         0x80000003 0x0020C1
10.1.2.0        10.1.2.1        1333        0x80000006 0x008C91
10.1.12.0       10.1.2.1        1333        0x80000006 0x00963E
r3#

then slam this in r2

r2(config)#router ospf 1
r2(config-router)#area 23 stub no-summary
r2(config-router)#end

and behold

r3#sh ip route ospf

Gateway of last resort is 10.1.23.2 to network 0.0.0.0

O*IA  0.0.0.0/0 [110/65] via 10.1.23.2, 00:01:45, Serial1/3

r3#sh ip ospf data

            OSPF Router with ID (10.1.3.1) (Process ID 1)

        Router Link States (Area 23)

Link ID         ADV Router      Age         Seq#       Checksum Link count
10.1.2.1        10.1.2.1        1045        0x80000008 0x00220B 2
10.1.3.1        10.1.3.1        979         0x80000008 0x000FFD 3

        Summary Net Link States (Area 23)

Link ID         ADV Router      Age         Seq#       Checksum
0.0.0.0         10.1.2.1        176         0x80000004 0x0035F7
r3#

okay...

NSSA: This type of area allows the flexibility of importing a few external routes into the area while still trying to retain the stub characteristic. Assume that one of the routers in the stub area is connected to an external AS running a different routing protocol, it now becomes the ASBR, and hence the area can no more be called a stub area. However, if the area is configured as a NSSA, then the ASBR generates a NSSA external link-state advertisement (LSA) (Type-7) which can be flooded throughout the NSSA area. These Type-7 LSAs are converted into Type-5 LSAs at the NSSA ABR and flooded throughout the OSPF domain

To define a NSSA, use the OSPF router configuration command, area

nssa no-summary.

For more information on NSSA, refer to OSPF Not-So-Stubby Area.

first, lose the stub... then cook it on both sides...

r3(config)#router ospf 1
r3(config-router)#no area 23 stub
r3(config-router)#
*Aug  5 14:21:56: %OSPF-5-ADJCHG: Process 1, Nbr 10.1.2.1 on Serial1/3 from FULL to DOWN, Neighbor Down: Adjacency forced to reset
r3(config-router)#area 23 nssa
r3(config-router)#redistribute connected subnets
r3(config-router)#
*Aug  5 14:22:04: %OSPF-5-ADJCHG: Process 1, Nbr 10.1.2.1 on Serial1/3 from DOWN to DOWN, Neighbor Down: Adjacency forced to reset
r3(config-router)#
*Aug  5 14:22:44: %OSPF-5-ADJCHG: Process 1, Nbr 10.1.2.1 on Serial1/3 from LOADING to FULL, Loading Done
r3(config-router)#

if you don't use the redistribute connected subnets command you will only get classful network redistribution...

r2#sh ip ospf
 Routing Process "ospf 1" with ID 10.1.2.1
 Start time: 00:00:11.876, Time elapsed: 03:57:07.532
 Supports only single TOS(TOS0) routes
 Supports opaque LSA
 Supports Link-local Signaling (LLS)
 Supports area transit capability
 Supports NSSA (compatible with RFC 3101)
 Event-log enabled, Maximum number of events: 1000, Mode: cyclic
 It is an area border and autonomous system boundary router
 Redistributing External Routes from,
 Router is not originating router-LSAs with maximum metric
 Initial SPF schedule delay 5000 msecs
 Minimum hold time between two consecutive SPFs 10000 msecs
 Maximum wait time between two consecutive SPFs 10000 msecs
 Incremental-SPF disabled
 Minimum LSA interval 5 secs
 Minimum LSA arrival 1000 msecs
 LSA group pacing timer 240 secs
 Interface flood pacing timer 33 msecs
 Retransmission pacing timer 66 msecs
 Number of external LSA 1. Checksum Sum 0x00FA03
 Number of opaque AS LSA 0. Checksum Sum 0x000000
 Number of DCbitless external and opaque AS LSA 0
 Number of DoNotAge external and opaque AS LSA 0
 Number of areas in this router is 2. 1 normal 0 stub 1 nssa
 Number of areas transit capable is 0
 External flood list length 0
 IETF NSF helper support enabled
 Cisco NSF helper support enabled
 Reference bandwidth unit is 100 mbps
    Area BACKBONE(0)
        Number of interfaces in this area is 2
    Area has no authentication
    SPF algorithm last executed 00:05:41.308 ago
    SPF algorithm executed 10 times
    Area ranges are
    Number of LSA 4. Checksum Sum 0x028D62
    Number of opaque link LSA 0. Checksum Sum 0x000000
    Number of DCbitless LSA 0
    Number of indication LSA 0
    Number of DoNotAge LSA 0
    Flood list length 0
    Area 23
        Number of interfaces in this area is 1
        It is a NSSA area
        Perform type-7/type-5 LSA translation
        Area has no authentication
    SPF algorithm last executed 00:03:32.156 ago
    SPF algorithm executed 11 times
    Area ranges are
    Number of LSA 6. Checksum Sum 0x02884C
    Number of opaque link LSA 0. Checksum Sum 0x000000
    Number of DCbitless LSA 0
    Number of indication LSA 0
    Number of DoNotAge LSA 0
    Flood list length 0

the point, and also below, bringing in lo20...

r2#sh ip route

Gateway of last resort is not set

      10.0.0.0/8 is variably subnetted, 8 subnets, 2 masks
O        10.1.1.0/24 [110/65] via 10.1.12.1, 00:07:39, Serial1/1
C        10.1.2.0/24 is directly connected, Loopback2
L        10.1.2.1/32 is directly connected, Loopback2
O        10.1.3.0/24 [110/65] via 10.1.23.3, 00:07:29, Serial1/3
C        10.1.12.0/24 is directly connected, Serial1/1
L        10.1.12.2/32 is directly connected, Serial1/1
C        10.1.23.0/24 is directly connected, Serial1/3
L        10.1.23.2/32 is directly connected, Serial1/3
      172.16.0.0/24 is subnetted, 1 subnets
O N2     172.16.200.0 [110/20] via 10.1.23.3, 00:05:20, Serial1/3

the N2 makes it special... also, on r1, the default route is gone and E2 shows up for lo20 on r3...

r1#sh ip route

Gateway of last resort is not set

      10.0.0.0/8 is variably subnetted, 7 subnets, 2 masks
C        10.1.1.0/24 is directly connected, Loopback1
L        10.1.1.1/32 is directly connected, Loopback1
O        10.1.2.0/24 [110/65] via 10.1.12.2, 01:58:13, Serial1/1
O IA     10.1.3.0/24 [110/129] via 10.1.12.2, 00:16:20, Serial1/1
C        10.1.12.0/24 is directly connected, Serial1/1
L        10.1.12.1/32 is directly connected, Serial1/1
O IA     10.1.23.0/24 [110/128] via 10.1.12.2, 01:58:13, Serial1/1
      172.16.0.0/24 is subnetted, 1 subnets
O E2     172.16.200.0 [110/20] via 10.1.12.2, 00:14:10, Serial1/1


another look at r3...

r3#sh ip route

Gateway of last resort is not set

      10.0.0.0/8 is variably subnetted, 7 subnets, 2 masks
O IA     10.1.1.0/24 [110/129] via 10.1.23.2, 00:18:31, Serial1/3
O IA     10.1.2.0/24 [110/65] via 10.1.23.2, 00:18:31, Serial1/3
C        10.1.3.0/24 is directly connected, Loopback3
L        10.1.3.1/32 is directly connected, Loopback3
O IA     10.1.12.0/24 [110/128] via 10.1.23.2, 00:18:31, Serial1/3
C        10.1.23.0/24 is directly connected, Serial1/3
L        10.1.23.3/32 is directly connected, Serial1/3
      172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C        172.16.200.0/24 is directly connected, Loopback20
L        172.16.200.1/32 is directly connected, Loopback20


note: a default route for nssa is not automatically injected by the abr... but

r2(config)#router ospf 1
r2(config-router)#area 23 nssa default-i
r2(config-router)#area 23 nssa default-information-originate

r3#sh ip route

Gateway of last resort is 10.1.23.2 to network 0.0.0.0

O*N2  0.0.0.0/0 [110/1] via 10.1.23.2, 00:00:26, Serial1/3
      10.0.0.0/8 is variably subnetted, 7 subnets, 2 masks
O IA     10.1.1.0/24 [110/129] via 10.1.23.2, 00:21:41, Serial1/3
O IA     10.1.2.0/24 [110/65] via 10.1.23.2, 00:21:41, Serial1/3
C        10.1.3.0/24 is directly connected, Loopback3
L        10.1.3.1/32 is directly connected, Loopback3
O IA     10.1.12.0/24 [110/128] via 10.1.23.2, 00:21:41, Serial1/3
C        10.1.23.0/24 is directly connected, Serial1/3
L        10.1.23.3/32 is directly connected, Serial1/3
      172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C        172.16.200.0/24 is directly connected, Loopback20
L        172.16.200.1/32 is directly connected, Loopback20

guess what this does?

r2(config-router)#no area 23 nssa def
r2(config-router)#no area 23 nssa default-information-originate
r2(config-router)#area 23 nssa no-summ

gets rid of the ia's, replaced with a single default...

r3#sh ip route

Gateway of last resort is 10.1.23.2 to network 0.0.0.0

O*IA  0.0.0.0/0 [110/65] via 10.1.23.2, 00:02:19, Serial1/3
      10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
C        10.1.3.0/24 is directly connected, Loopback3
L        10.1.3.1/32 is directly connected, Loopback3
C        10.1.23.0/24 is directly connected, Serial1/3
L        10.1.23.3/32 is directly connected, Serial1/3
      172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C        172.16.200.0/24 is directly connected, Loopback20
L        172.16.200.1/32 is directly connected, Loopback20
r3#

but more importantly... remember above on r2 the link type 7/5 translation?
now you are a totally stubby not so stubby area dude... who made this shit up?
a greasy lightning fast totally stubby not so stubby area monster...

r2#sh ip ospf data

            OSPF Router with ID (10.1.2.1) (Process ID 1)

        Router Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum Link count
10.1.1.1        10.1.1.1        1463        0x80000007 0x0050D9 3
10.1.2.1        10.1.2.1        1179        0x8000000B 0x004DD2 3

        Summary Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum
10.1.3.0        10.1.2.1        1425        0x80000002 0x00EDF0
10.1.23.0       10.1.2.1        1179        0x80000009 0x00F8CB

        Router Link States (Area 23)

Link ID         ADV Router      Age         Seq#       Checksum Link count
10.1.2.1        10.1.2.1        1425        0x8000000D 0x00A578 2
10.1.3.1        10.1.3.1        1377        0x8000000D 0x00926B 3

        Summary Net Link States (Area 23)

Link ID         ADV Router      Age         Seq#       Checksum
0.0.0.0         10.1.2.1        562         0x80000001 0x00C265

        Type-7 AS External Link States (Area 23)

Link ID         ADV Router      Age         Seq#       Checksum Tag
172.16.200.0    10.1.3.1        1377        0x80000002 0x005D94 0

        Type-5 AS External Link States

Link ID         ADV Router      Age         Seq#       Checksum Tag
172.16.200.0    10.1.2.1        1179        0x80000002 0x00F804 0

of course, the chapter  just wouldn't be the same if we didn't end on a low note... they always save the best for last... key chains...  eeerrrrrrp...

but you love key chains, arteq...

r3(config)#int s1/3
r3(config-if)#ip ospf authentication-key suck-key
r3(config-if)#
*Aug  5 15:46:52: %OSPF-5-ADJCHG: Process 1, Nbr 10.1.2.1 on Serial1/3 from LOADING to FULL, Loading Done
r3(config-if)#

r2#sh run int s1/3
Building configuration...

Current configuration : 166 bytes
!
interface Serial1/3
 ip address 10.1.23.2 255.255.255.0
 ip ospf authentication
 ip ospf authentication-key suck-key
 serial restart-delay 0
 clock rate 64000
end

r2#
*Aug  5 15:46:52: %OSPF-5-ADJCHG: Process 1, Nbr 10.1.3.1 on Serial1/3 from LOADING to FULL, Loading Done
r2#sh ip ospf int s1/3
Serial1/3 is up, line protocol is up
  Internet Address 10.1.23.2/24, Area 23, Attached via Network Statement
  Process ID 1, Router ID 10.1.2.1, Network Type POINT_TO_POINT, Cost: 64
  Topology-MTID    Cost    Disabled    Shutdown      Topology Name
        0           64        no          no            Base
  Transmit Delay is 1 sec, State POINT_TO_POINT
  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
    oob-resync timeout 40
    Hello due in 00:00:06
  Supports Link-local Signaling (LLS)
  Cisco NSF helper support enabled
  IETF NSF helper support enabled
  Index 1/3, flood queue length 0
  Next 0x0(0)/0x0(0)
  Last flood scan length is 1, maximum is 3
  Last flood scan time is 4 msec, maximum is 4 msec
  Neighbor Count is 1, Adjacent neighbor count is 1
    Adjacent with neighbor 10.1.3.1
  Suppress hello for 0 neighbor(s)
  Simple password authentication enabled
r2#sh ip ospf neigh

Neighbor ID     Pri   State           Dead Time   Address         Interface
10.1.1.1          0   FULL/  -        00:00:34    10.1.12.1       Serial1/1
10.1.3.1          0   FULL/  -        00:00:37    10.1.23.3       Serial1/3

and you can make it md5 with

ip ospf authenti message-digest
ip ospf message-digest-key 1 md5 suck-key

on both sides... have fun with that...