NETWORK NOTES : OSPF

OSPF over DMVPN

R2 - HUB
R4 & R9 Spoke

R2

Public Interface :- GigabitEthernet1/0 :- IP 28.0.0.2 2

interface Tunnel0
ip address 172.16.0.2 255.255.255.0
no ip redirects
ip nhrp authentication DMVPN
ip nhrp map multicast dynamic
ip nhrp network-id 1
ip ospf network point-to-multipoint
tunnel source GigabitEthernet1/0
tunnel mode gre multipoint

R9

Public Interface :-FastEthernet1/1 IP:- 98.0.0.9

interface Tunnel0
ip address 172.16.0.9 255.255.255.0
no ip redirects
ip nhrp authentication DMVPN
ip nhrp map 172.16.0.2 28.0.0.2
ip nhrp map multicast 28.0.0.2
ip nhrp network-id 1
ip nhrp nhs 172.16.0.2
tunnel source FastEthernet1/1
tunnel mode gre multipoint

Public Interface :-FastEthernet0/0 IP :-84.0.0.4

interface Tunnel0

ip address 172.16.0.4 255.255.255.0

no ip redirects

ip nhrp authentication DMVPN

ip nhrp map 172.16.0.2 28.0.0.2

ip nhrp map multicast 28.0.0.2

ip nhrp network-id 1

ip nhrp nhs 172.16.0.2

tunnel source FastEthernet0/0

tunnel mode gre multipoint

****************************************************

R2

R2#sh dmvpn
Legend: Attrb --> S - Static, D - Dynamic, I - Incomplete
N - NATed, L - Local, X - No Socket
# Ent --> Number of NHRP entries with same NBMA peer
NHS Status: E --> Expecting Replies, R --> Responding, W --> Waiting
UpDn Time --> Up or Down Time for a Tunnel
==========================================================================

Interface: Tunnel0, IPv4 NHRP Details
Type:Hub, NHRP Peers:2,

# Ent Peer NBMA Addr Peer Tunnel Add State UpDn Tm Attrb
----- --------------- --------------- ----- -------- -----
1 84.0.0.4 172.16.0.4 UP 01:40:54 D
1 98.0.0.9 172.16.0.9 UP 01:42:43 D

R9

R9#sh dmvpn

==========================================================================

Interface: Tunnel0, IPv4 NHRP Details
Type:Spoke, NHRP Peers:1,

# Ent Peer NBMA Addr Peer Tunnel Add State UpDn Tm Attrb
----- --------------- --------------- ----- -------- -----
1 28.0.0.2 172.16.0.2 UP 01:44:14 S

sh dmvpn

Interface: Tunnel0, IPv4 NHRP Details
Type:Spoke, NHRP Peers:1,

# Ent Peer NBMA Addr Peer Tunnel Add State UpDn Tm Attrb
----- --------------- --------------- ----- -------- -----

1 28.0.0.2 172.16.0.2 UP 01:42:43 S

***************************************************************

***********************OSPF*********************

OSPF Configuration

router ospf 10

network 9.9.9.9 0.0.0.0 area 2

network 172.16.0.9 0.0.0.0 area 2

router ospf 10

network 23.0.0.0 0.0.0.255 area 0

network 25.0.0.0 0.0.0.255 area 0

network 172.16.0.2 0.0.0.0 area 2

router ospf 10

network 34.0.0.0 0.0.0.255 area 0

network 172.16.0.4 0.0.0.0 area 2

Neigborship will be flap

*Aug 19 02:50:51.419: %OSPF-5-ADJCHG: Process 10, Nbr 172.16.0.9 on Tunnel0 from LOADING to DOWN, Neighbor Down: Adjacency forced to reset

*Aug 19 02:50:52.059: %OSPF-5-ADJCHG: Process 10, Nbr 44.4.4.4 on Tunnel0 from EXCHANGE to DOWN, Neighbor Down: Adjacency forced to reset

*Aug 19 02:50:52.163: %OSPF-5-ADJCHG: Process 10, Nbr 172.16.0.9 on Tunnel0 from EXCHANGE to DOWN, Neighbor Down: Adjacency forced to reset

R2#

*Aug 19 02:50:52.691: %OSPF-5-ADJCHG: Process 10, Nbr 44.4.4.4 on Tunnel0 from EXCHANGE to DOWN, Neighbor Down: Adjacency forced to reset

*Aug 19 02:50:53.263: %OSPF-5-ADJCHG: Process 10, Nbr 172.16.0.9 on Tunnel0 from EXCHANGE to DOWN, Neighbor Down: Adjacency forced to reset

R2#

*Aug 19 02:50:53.963: %OSPF-5-ADJCHG: Process 10, Nbr 44.4.4.4 on Tunnel0 from EXCHANGE to DOWN, Neighbor Down: Adjacency forced to reset

*Aug 19 02:50:54.123: %OSPF-5-ADJCHG: Process 10, Nbr 172.16.0.9 on Tunnel0 from EXCHANGE to DOWN, Neighbor Down: Adjacency forced to reset

sh ip ospf int tun0

R2#sh ip ospf int tun 0

Tunnel0 is up, line protocol is up

Internet Address 172.16.0.2/24, Area 2, Attached via Network Statement

Process ID 10, Router ID 2.2.2.2, Network Type POINT_TO_POINT, Cost: 1000

Topology-MTID Cost Disabled Shutdown Topology Name

0 1000 no no Base

Transmit Delay is 1 sec, State POINT_TO_POINT

in point to point network only one neighbor is allowed but here it making more then one network.

to avoid this

we will have to change network type.

R2-R4-R9

1- Point-to-multipoint

int tun0

ip ospf network point-to-multipoint

Now in R2

R2#sh ip ospf nei

Neighbor ID Pri State Dead Time Address Interface

39.1.4.1 1 FULL/DR 00:00:38 23.0.0.3 FastEthernet0/1

55.5.5.5 1 FULL/BDR 00:00:37 25.0.0.5 FastEthernet0/0

44.4.4.4 0 FULL/ - 00:01:56 172.16.0.4 Tunnel0

172.16.0.9 0 FULL/ - 00:01:43 172.16.0.9 Tunnel0

R9#sh ip ospf nei

Neighbor ID Pri State Dead Time Address Interface

2.2.2.2 0 FULL/ - 00:01:40 172.16.0.2 Tunnel0

R4#sh ip ospf nei

Neighbor ID Pri State Dead Time Address Interface

39.1.4.1 1 FULL/BDR 00:00:37 34.0.0.3 GigabitEthernet1/0

2.2.2.2 0 FULL/ - 00:01:38 172.16.0.2 Tunnel0

2- Broadcast

R2- DR
int tun0
ip ospf network broadcast

R4- R9
int tun0
ip ospf network broadcast
ip ospf priority 0

R4#sh ip ospf nei

Neighbor ID Pri State Dead Time Address Interface
39.1.4.1 1 FULL/BDR 00:00:32 34.0.0.3 GigabitEthernet1/0
2.2.2.2 1 FULL/DR 00:00:31 172.16.0.2 Tunnel0

R9#sh ip ospf nei

Neighbor ID Pri State Dead Time Address Interface

2.2.2.2 1 FULL/DR 00:00:30 172.16.0.2 Tunnel0

R2#sh ip ospf nei

Neighbor ID Pri State Dead Time Address Interface

44.4.4.4 0 FULL/DROTHER 00:00:33 172.16.0.4 Tunnel0

172.16.0.9 0 FULL/DROTHER 00:00:33 172.16.0.9 Tunnel0

R2#sh ip ospf int tun0

Tunnel0 is up, line protocol is up

Internet Address 172.16.0.2/24, Area 2, Attached via Network Statement

Process ID 10, Router ID 2.2.2.2, Network Type BROADCAST, Cost: 1000

Topology-MTID Cost Disabled Shutdown Topology Name

0 1000 no no Base

Transmit Delay is 1 sec, State DR, Priority 1

Designated Router (ID) 2.2.2.2, Interface address 172.16.0.2

No backup designated router on this network

R9#sh ip ospf int tun0

Tunnel0 is up, line protocol is up

Internet Address 172.16.0.9/24, Area 2, Attached via Network Statement

Process ID 10, Router ID 172.16.0.9, Network Type BROADCAST, Cost: 1000

Topology-MTID Cost Disabled Shutdown Topology Name

0 1000 no no Base

Transmit Delay is 1 sec, State DROTHER, Priority 0

Designated Router (ID) 2.2.2.2, Interface address 172.16.0.2

No backup designated router on this network

R4#sh ip ospf int tun0

Tunnel0 is up, line protocol is up

Internet Address 172.16.0.4/24, Area 2, Attached via Network Statement

Process ID 10, Router ID 44.4.4.4, Network Type BROADCAST, Cost: 1000

Topology-MTID Cost Disabled Shutdown Topology Name

0 1000 no no Base

Transmit Delay is 1 sec, State DROTHER, Priority 0

Designated Router (ID) 2.2.2.2, Interface address 172.16.0.2

3:- Non Broadcast

interface Tunnel0

ip ospf network non-broadcast

R4-R9

int tun0

ip ospf network non-broadcast

ip ospf priority 0

44.4.4.4 0 FULL/DROTHER 00:01:47 172.16.0.4 Tunnel0

172.16.0.9 0 FULL/DROTHER 00:01:58 172.16.0.9 Tunnel0

R2#

R9#sh ip ospf nei

Neighbor ID Pri State Dead Time Address Interface

2.2.2.2 1 FULL/DR 00:01:31 172.16.0.2 Tunnel0

R9#

R4#sh ip ospf nei

2.2.2.2 1 FULL/DR 00:01:05 172.16.0.2 Tunnel0

R4#

R9#sh ip route ospf

Gateway of last resort is not set

6.0.0.0/32 is subnetted, 1 subnets
O IA 6.6.6.6 [110/1003] via 172.16.0.2, 00:04:08, Tunnel0
13.0.0.0/24 is subnetted, 1 subnets
O IA 13.0.0.0 [110/1002] via 172.16.0.4, 00:04:03, Tunnel0
[110/1002] via 172.16.0.2, 00:04:08, Tunnel0
15.0.0.0/24 is subnetted, 1 subnets
O IA 15.0.0.0 [110/1002] via 172.16.0.2, 00:04:08, Tunnel0
16.0.0.0/24 is subnetted, 1 subnets
O IA 16.0.0.0 [110/1003] via 172.16.0.4, 00:04:03, Tunnel0
[110/1003] via 172.16.0.2, 00:04:08, Tunnel0
23.0.0.0/24 is subnetted, 1 subnets
O IA 23.0.0.0 [110/1001] via 172.16.0.2, 00:04:08, Tunnel0
25.0.0.0/24 is subnetted, 1 subnets
O IA 25.0.0.0 [110/1001] via 172.16.0.2, 00:04:08, Tunnel0
34.0.0.0/24 is subnetted, 1 subnets
O IA 34.0.0.0 [110/1001] via 172.16.0.4, 00:04:03, Tunnel0
56.0.0.0/24 is subnetted, 1 subnets
O IA 56.0.0.0 [110/1002] via 172.16.0.2, 00:04:08, Tunnel0
R9#

R4

Gateway of last resort is not set

6.0.0.0/32 is subnetted, 1 subnets
O IA 6.6.6.6 [110/4] via 34.0.0.3, 01:30:39, GigabitEthernet1/0
9.0.0.0/32 is subnetted, 1 subnets
O 9.9.9.9 [110/1001] via 172.16.0.9, 00:05:15, Tunnel0
13.0.0.0/24 is subnetted, 1 subnets
O 13.0.0.0 [110/2] via 34.0.0.3, 02:21:11, GigabitEthernet1/0
15.0.0.0/24 is subnetted, 1 subnets
O 15.0.0.0 [110/3] via 34.0.0.3, 01:34:53, GigabitEthernet1/0
16.0.0.0/24 is subnetted, 1 subnets
O IA 16.0.0.0 [110/3] via 34.0.0.3, 01:34:05, GigabitEthernet1/0
23.0.0.0/24 is subnetted, 1 subnets
O 23.0.0.0 [110/2] via 34.0.0.3, 02:21:11, GigabitEthernet1/0
25.0.0.0/24 is subnetted, 1 subnets
O 25.0.0.0 [110/3] via 34.0.0.3, 00:07:06, GigabitEthernet1/0
56.0.0.0/24 is subnetted, 1 subnets
O IA 56.0.0.0 [110/4] via 34.0.0.3, 01:32:31, GigabitEthernet1/0
R4#

R4#sh ip ospf data

OSPF Router with ID (44.4.4.4) (Process ID 10)

Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count

1.1.1.1 1.1.1.1 1569 0x80000008 0x00AE26 2

2.2.2.2 2.2.2.2 491 0x80000008 0x005549 2

39.1.4.1 39.1.4.1 396 0x8000000D 0x004DBF 3

44.4.4.4 44.4.4.4 678 0x80000006 0x000769 1

55.5.5.5 55.5.5.5 498 0x80000009 0x00D05C 2

Net Link States (Area 0)

Link ID ADV Router Age Seq# Checksum

13.0.0.3 39.1.4.1 396 0x80000005 0x00BF08

15.0.0.1 1.1.1.1 1569 0x80000003 0x00F4E4

23.0.0.3 39.1.4.1 496 0x80000007 0x006B4C

25.0.0.5 55.5.5.5 501 0x80000001 0x003B4C

34.0.0.4 44.4.4.4 678 0x80000005 0x007002

Summary Net Link States (Area 0)

Link ID ADV Router Age Seq# Checksum

6.6.6.6 1.1.1.1 1569 0x80000003 0x0066B6

6.6.6.6 55.5.5.5 1659 0x80000003 0x002AB0

9.9.9.9 2.2.2.2 371 0x80000001 0x00EB38

9.9.9.9 44.4.4.4 370 0x80000001 0x0046AD

16.0.0.0 1.1.1.1 1825 0x80000003 0x00A085

16.0.0.0 55.5.5.5 1659 0x80000003 0x006E74

56.0.0.0 1.1.1.1 1569 0x80000003 0x00A05C

56.0.0.0 55.5.5.5 1659 0x80000003 0x005A61

172.16.0.0 2.2.2.2 492 0x80000001 0x00FB90

172.16.0.0 44.4.4.4 1483 0x80000001 0x005606

Router Link States (Area 2)

Link ID ADV Router Age Seq# Checksum Link count

2.2.2.2 2.2.2.2 380 0x80000002 0x006B4D 1

44.4.4.4 44.4.4.4 344 0x80000015 0x0055ED 1

172.16.0.9 172.16.0.9 363 0x80000014 0x00846B 2

Net Link States (Area 2)

Link ID ADV Router Age Seq# Checksum

172.16.0.2 2.2.2.2 380 0x80000001 0x005A0F

Summary Net Link States (Area 2)

Link ID ADV Router Age Seq# Checksum

6.6.6.6 2.2.2.2 490 0x80000001 0x0056C3

6.6.6.6 44.4.4.4 1704 0x80000004 0x00B431

13.0.0.0 2.2.2.2 490 0x80000001 0x00B76E

13.0.0.0 44.4.4.4 678 0x80000005 0x000AE7

15.0.0.0 2.2.2.2 490 0x80000001 0x009D86

15.0.0.0 44.4.4.4 1944 0x80000003 0x00FDF2

16.0.0.0 2.2.2.2 490 0x80000001 0x009A87

16.0.0.0 44.4.4.4 1704 0x80000003 0x00F0FE

23.0.0.0 2.2.2.2 490 0x80000001 0x002BF1

23.0.0.0 44.4.4.4 678 0x80000005 0x008760

25.0.0.0 2.2.2.2 490 0x80000001 0x00110A

25.0.0.0 44.4.4.4 480 0x80000007 0x00736F

34.0.0.0 2.2.2.2 490 0x80000001 0x00A56B

34.0.0.0 44.4.4.4 678 0x80000005 0x00EDEF

56.0.0.0 2.2.2.2 490 0x80000001 0x008674

56.0.0.0 44.4.4.4 1704 0x80000003 0x00F0D5

R4#

Point-to-multipoint non-broadcast

int tun0
ip ospf network point-to-multipoint non-broadcast

router ospf 10
network 23.0.0.0 0.0.0.255 area 0
network 25.0.0.0 0.0.0.255 area 0
network 172.16.0.2 0.0.0.0 area 2
neighbor 172.16.0.4

neighbor 172.16.0.9

R4-R9
nt tun0
ip ospf network point-to-multipoint non-broadcast

Tunnel0 is up, line protocol is up
Internet Address 172.16.0.2/24, Area 2, Attached via Network Statement
Process ID 10, Router ID 2.2.2.2, Network Type POINT_TO_MULTIPOINT, Cost: 1000
Topology-MTID Cost Disabled Shutdown Topology Name
0 1000 no no Base
Transmit Delay is 1 sec, State POINT_TO_MULTIPOINT
Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
oob-resync timeout 120
Hello due in 00:00:06

No DR-BDR selection in this network type

R4
R4# sh ip route 9.9.9.9
Routing entry for 9.9.9.9/32
Known via "ospf 10", distance 110, metric 2001, type intra area
Last update from 172.16.0.2 on Tunnel0, 00:02:25 ago
Routing Descriptor Blocks:
* 172.16.0.2, from 172.16.0.9, 00:02:25 ago, via Tunnel0
Route metric is 2001, traffic share count is 1
R4#

R4#trace 9.9.9.9
Type escape sequence to abort.
Tracing the route to 9.9.9.9
VRF info: (vrf in name/id, vrf out name/id)
1 172.16.0.2 364 msec 192 msec 168 msec
2 172.16.0.9 248 msec 324 msec 232 msec
R4#

R2#sh ip ospf database router self-originate

Router Link States (Area 2)

LS age: 723

Options: (No TOS-capability, DC)

LS Type: Router Links

Link State ID: 2.2.2.2

Advertising Router: 2.2.2.2

LS Seq Number: 8000000E

Checksum: 0x499D

Length: 60

Area Border Router

Number of Links: 3

Link connected to: another Router (point-to-point)

(Link ID) Neighboring Router ID: 44.4.4.4

(Link Data) Router Interface address: 172.16.0.2

Number of MTID metrics: 0

TOS 0 Metrics: 1000

Link connected to: another Router (point-to-point)

(Link ID) Neighboring Router ID: 172.16.0.9

(Link Data) Router Interface address: 172.16.0.2

Number of MTID metrics: 0

TOS 0 Metrics: 1000

Link connected to: a Stub Network

(Link ID) Network/subnet number: 172.16.0.2

(Link Data) Network Mask: 255.255.255.255

Number of MTID metrics: 0

TOS 0 Metrics: 0

NETWORK NOTES

Tuesday, August 18, 2015

OSPF - DMVPN

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