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Question related to OSPF process ID

Hello Netpros,

My question is related to the OSPF different process ids running on a single router.Do there is any method to synchronize two different OSPF ids advertised network to the neighbor routing table.

R1#sh ip ospf database

OSPF Router with ID (10.10.2.1) (Process ID 12)

Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count

10.10.2.1 10.10.2.1 192 0x80000001 0x00548B 1

OSPF Router with ID (2.2.2.2) (Process ID 28)

Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count

1.1.1.1 1.1.1.1 1042 0x80000008 0x00E943 4

2.2.2.2 2.2.2.2 1559 0x80000004 0x0038F1 4

3.3.3.3 3.3.3.3 1525 0x80000003 0x00F82B 4

R1#show ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

9.0.0.0/32 is subnetted, 1 subnets

C 9.9.9.9 is directly connected, Loopback9

10.0.0.0/32 is subnetted, 6 subnets

O 10.10.2.2 [110/65] via 10.10.2.2, 00:48:18, Serial0/2

O 10.10.1.1 [110/65] via 10.10.0.1, 00:48:18, Serial0/0

O 10.10.0.1 [110/65] via 10.10.0.1, 00:48:18, Serial0/0

C 10.10.0.2 is directly connected, Loopback0

C 10.10.2.1 is directly connected, Loopback2

O 10.10.1.2 [110/65] via 10.10.2.2, 00:48:18, Serial0/2

R2#sh ip ospf database

OSPF Router with ID (10.10.2.2) (Process ID 12)

Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count

10.10.2.2 10.10.2.2 690 0x80000002 0x0020C0 1

OSPF Router with ID (3.3.3.3) (Process ID 28)

Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count

1.1.1.1 1.1.1.1 1103 0x80000008 0x00E943 4

2.2.2.2 2.2.2.2 1620 0x80000004 0x0038F1 4

3.3.3.3 3.3.3.3 1584 0x80000003 0x00F82B 4

R2#sh ip route

R2#sh ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

8.0.0.0/32 is subnetted, 1 subnets

C 8.8.8.8 is directly connected, Loopback8

10.0.0.0/32 is subnetted, 6 subnets

C 10.10.2.2 is directly connected, Loopback2

O 10.10.1.1 [110/65] via 10.10.1.1, 00:49:02, Serial0/1

O 10.10.0.1 [110/65] via 10.10.1.1, 00:49:02, Serial0/1

O 10.10.0.2 [110/65] via 10.10.2.1, 00:49:02, Serial0/2

O 10.10.2.1 [110/65] via 10.10.2.1, 00:49:02, Serial0/2

C 10.10.1.2 is directly connected, Loopback0

I know OSPF process id is used to identify the OSPF routing process and it kept different database table for each process.But just for a curiosity is this possible?

Thanks

Prasad

6 REPLIES

Re: Question related to OSPF process ID

For more clarification

R1#sh run | be ospf

router ospf 28

router-id 2.2.2.2

log-adjacency-changes

network 10.10.0.2 0.0.0.0 area 0

network 10.10.2.1 0.0.0.0 area 0

!

router ospf 12

log-adjacency-changes

network 9.9.9.9 0.0.0.0 area 0

R2#sh run | be ospf

router ospf 28

router-id 3.3.3.3

log-adjacency-changes

network 10.10.1.2 0.0.0.0 area 0

network 10.10.2.2 0.0.0.0 area 0

!

router ospf 12

log-adjacency-changes

network 8.8.8.8 0.0.0.0 area 0

!

ip http server

no ip http secure-server

!

!

!

!

!

!

control-plane

Thanks

Prasad

Hall of Fame Super Bronze

Re: Question related to OSPF process ID

You can't synchronize them but you can redistribute between OSPF processes to have routes from each OSPF database distributed to their respective neighbors.

HTH,

__

Edison.

Re: Question related to OSPF process ID

Thank You Edison.

Could you give me any example how to redistribute between OSPF processes.

One more question when i was trying to add one more OSPF process on a single router i get some messages , please can you explain this....

"*Mar 1 00:32:24.755: OSPF: Start redist-scanning

*Mar 1 00:32:24.755: OSPF: Scan the RIB for both redistribution and translation

*Mar 1 00:32:24.775: OSPF: End scanning, Elapsed time 20ms^Z"

Thanks

Prasad

Hall of Fame Super Bronze

Re: Question related to OSPF process ID

router ospf 28

router-id 2.2.2.2

redistribute ospf 12 subnets

log-adjacency-changes

network 10.10.0.2 0.0.0.0 area 0

network 10.10.2.1 0.0.0.0 area 0

!

router ospf 12

log-adjacency-changes

Re: Question related to OSPF process ID

OSPF hello packets do not contains process id.

So when the hello packet is exchanged with matching all the required field then atleast the neighbor router will make a INIT state relationship with this router(Process id doesn't matter here).

If so then why the neighborhood relationship table is not showing the adjacency with the router id 10.10.2.2..

R1#sh ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface

3.3.3.3 0 FULL/ - 00:00:36 10.10.2.2 Serial0/2

1.1.1.1 0 FULL/ - 00:00:38 10.10.0.1 Serial0/0

Thanks

Prasad

Cisco Employee

Re: Question related to OSPF process ID

Prasad,

Each interface can only belong to one ospf process. So the neighbor relationship will be established one of the two process ids for a given interface.

show ip ospf interface tells you which process id owns the interface.

Regards

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México 
Paseo de la Reforma 222 Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
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