Solved: Why 2 ospf process ids does not work on Single Router

mahesh18 · ‎02-18-2012

Hi all,

On OSPF working router i have this config

Router 1

router ospf 1

with few network commands

Router 2

I added the new Router 2 to existing OSPF network and did this

router ospf 100 ******************

network x.x.x.x

Router 1

router ospf 100 ***************************

network x.x.x.x

Now this is what i found

while using router ospf 100 i do not form any nei relationship.

Also i run the debug command on both routers and found that Router 1 and Router 2 do not send any hellos.

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

If i use the router ospf 1 on R1 and new Router 2 ospf nei relationship works fine.

I need to know on single router can we use more than 1 process id?

why using router ospf 100 nei relationship does not establish and no packets are send?

Thanks

mahesh

lgijssel · ‎02-19-2012

Hi Mahesh,

Please check the following link:

http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080094e9e.shtml

It describes -among others- the requirements for peers to become ospf neighbors.

The subnet mask you have used will probabably not help.

regards,

Leo

View solution in original post

Richard Burts · ‎02-19-2012

Mahesh

My appoligies - when I look more closely I realize that I was mistaken, caused by the formatting of the output. I was expecting to see router ospf starting from the left margin and this is not what was in the posted config

--More-- router ospf 100

So you are correct that OSPF is configured on both devices.

To understand the issue it might be helpful if you would post the output of show interface FastEthernet0/0 (or show ip ospf interface FastEthernet0/0) from host BB. It would also help if you would post the output of show ip ospf from both devices.

HTH

Rick

HTH

Rick

View solution in original post

lgijssel · ‎02-19-2012

Hi Mahesh,

First of all: It is possible to run more than one ospf process on a router.

The process-id does not have any significance in determining whether neigbors are established or not.

The only relevant thing in that respect is that the processes must share a common subnet and must be in the same area.

A less well-known issue is that the prefixes cannot be overlapping between different processes and this is likely your problem. If you have:

router ospf 1

network 192.168.1.0 0.0.0.255

You cannot also have:

router ospf 100

network 192.168.1.0 0.0.0.255

This is because interfaces can only be in one ospf process/area.

When your config looked similar to this, deleting ospf process 1 would have triggered neighbor relations from process 100 with router2.

regards,

Leo

mahesh18 · ‎02-19-2012

Hi Leo,

I had this config

router ospf 1

router-id 3.3.3.3

log-adjacency-changes

area 1 virtual-link 1.1.1.1

area 4 stub no-summary

passive-interface Vlan20

network 192.168.4.0 0.0.0.255 area 1

network 192.168.5.0 0.0.0.255 area 0

network 192.168.8.0 0.0.0.255 area 4

network 192.168.20.0 0.0.0.255 area 0

Router ospf 100

network 192.168.50.0 0.0.0.255 area 10

is they overlapping in this case?

Thanks

mahesh18 · ‎02-19-2012

Hi leo,

subnet i am using is 255.255.255.254 in the networks

Thanks

Mahesh

lgijssel · ‎02-19-2012

Hi Mahesh,

Please check the following link:

http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080094e9e.shtml

It describes -among others- the requirements for peers to become ospf neighbors.

The subnet mask you have used will probabably not help.

regards,

Leo

mahesh18 · ‎02-19-2012

Hi Leo,

I read the link which u sent.

I tried with different subnet mask like 255.255.255.0 its still same thing.

Thanks for the help

mahesh

lgijssel · ‎02-19-2012

The problem you have must be a basic issue. OSPF is very reliable in many releases.

It would help lot if you provided the config of BOTH routers.

regards,

Leo

mahesh18 · ‎02-19-2012

Hi Leo,

i added the config of both routers under my first post.

Thanks for help so far.

MAhesh

Richard Burts · ‎02-19-2012

Mahesh

I have looked at the configs that you have posted. When I look in the config of router BB I see EIGRP configured but I do not see OSPF configured. If OSPF is not confitgured then there can be no OSPF neighbors.

HTH

Rick

HTH

Rick

mahesh18 · ‎02-19-2012

Hi Rick,

Thanks for reply

There is OSPF config present on BB Router

router ospf 100

log-adjacency-changes

network 192.168.50.0 0.0.0.255 area 10.

Mahesh

Richard Burts · ‎02-19-2012

Mahesh

My appoligies - when I look more closely I realize that I was mistaken, caused by the formatting of the output. I was expecting to see router ospf starting from the left margin and this is not what was in the posted config

--More-- router ospf 100

So you are correct that OSPF is configured on both devices.

To understand the issue it might be helpful if you would post the output of show interface FastEthernet0/0 (or show ip ospf interface FastEthernet0/0) from host BB. It would also help if you would post the output of show ip ospf from both devices.

HTH

Rick

HTH

Rick

mahesh18 · ‎02-19-2012

Hi Rick,

Thanks for reply.

Strange here is what i did earlier --

I config the network 192.168.50.0 0.0.0.255 area 10 under both 3550 and BB Routers so that OSPF can work..

Now i config them under router ospf 100 on both routers and it started to work.

I am totally surprised how it is working now!!!?

3550

router ospf 1

router-id 3.3.3.3

log-adjacency-changes

area 1 virtual-link 1.1.1.1

area 4 stub no-summary

passive-interface Vlan20

network 192.168.4.0 0.0.0.255 area 1

network 192.168.5.0 0.0.0.255 area 0

network 192.168.8.0 0.0.0.255 area 4

network 192.168.20.0 0.0.0.255 area 0

!

router ospf 100

log-adjacency-changes

network 192.168.50.0 0.0.0.255 area 10************************

3550SMIA# sh ip ospf
Routing Process "ospf 100" with ID 192.168.50.3
Start time: 2d01h, Time elapsed: 00:19:28.352
Supports only single TOS(TOS0) routes
Supports opaque LSA
Supports Link-local Signaling (LLS)
Supports area transit capability
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 0x009838
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 1. 1 normal 0 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 10**********************************************************************************
        Number of interfaces in this area is 1
        Area has no authentication
        SPF algorithm last executed 00:05:13.176 ago
        SPF algorithm executed 5 times
        Area ranges are
        Number of LSA 24. Checksum Sum 0x146454
        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

Routing Process "ospf 1" with ID 3.3.3.3
Start time: 00:00:43.528, Time elapsed: 2d02h
Supports only single TOS(TOS0) routes
Supports opaque LSA
Supports Link-local Signaling (LLS)
Supports area transit capability
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 1. Checksum Sum 0x02DFD8
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 3. 2 normal 1 stub 0 nssa
Number of areas transit capable is 1
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 3
        Area has no authentication
        SPF algorithm last executed 00:13:56.532 ago
        SPF algorithm executed 6 times
        Area ranges are
        Number of LSA 26. Checksum Sum 0x29606B
        Number of opaque link LSA 0. Checksum Sum 0x000000
        Number of DCbitless LSA 0
        Number of indication LSA 0
        Number of DoNotAge LSA 7
        Flood list length 0
    Area 1
        Number of interfaces in this area is 1
        This area has transit capability: Virtual Link Endpoint
        Area has no authentication
        SPF algorithm last executed 00:13:56.536 ago
        SPF algorithm executed 6 times
        Area ranges are
        Number of LSA 19. Checksum Sum 0x101BEC
        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 4
        Number of interfaces in this area is 1
        It is a stub area, no summary LSA in this area
          generates stub default route with cost 1
        Area has no authentication
        SPF algorithm last executed 00:14:38.436 ago
        SPF algorithm executed 2 times
        Area ranges are
        Number of LSA 22. Checksum Sum 0x396ABA
        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

BB Router

BB#sh ip ospf int fa0/0

FastEthernet0/0 is up, line protocol is up

Internet Address 192.168.50.2/31, Area 10

Process ID 100, Router ID 172.30.8.1, Network Type BROADCAST, Cost: 1

Transmit Delay is 1 sec, State BDR, Priority 1

Designated Router (ID) 192.168.50.3, Interface address 192.168.50.3

Backup Designated router (ID) 172.30.8.1, Interface address 192.168.50.2

Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5

oob-resync timeout 40

Hello due in 00:00:01

Supports Link-local Signaling (LLS)

Index 1/1, flood queue length 0

Next 0x0(0)/0x0(0)

Last flood scan length is 1, maximum is 2

Last flood scan time is 0 msec, maximum is 0 msec

Neighbor Count is 1, Adjacent neighbor count is 1

Adjacent with neighbor 192.168.50.3 (Designated Router)

Suppress hello for 0 neighbor(s)

BB#

BB#sh int fa0/0

FastEthernet0/0 is up, line protocol is up

Hardware is AmdFE, address is 0007.eb7d.eca0 (bia 0007.eb7d.eca0)

Internet address is 192.168.50.2/31

MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 100Mb/s, 100BaseTX/FX

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:00:06, output 00:00:05, output hang never

Last clearing of "show interface" counters 01:46:31

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

1335 packets input, 167152 bytes

Received 782 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog

0 input packets with dribble condition detected

2253 packets output, 201658 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier

0 output buffer failures, 0 output buffers swapped out

BB#sh ip ospf

Routing Process "ospf 100" with ID 172.30.8.1

Start time: 2d01h, Time elapsed: 00:08:05.360

Supports only single TOS(TOS0) routes

Supports opaque LSA

Supports Link-local Signaling (LLS)

Supports area transit capability

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 0x009838

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 1. 1 normal 0 stub 0 nssa

Number of areas transit capable is 0

External flood list length 0

Area 10

Number of interfaces in this area is 1

Area has no authentication

SPF algorithm last executed 00:07:16.913 ago

SPF algorithm executed 1 times

Area ranges are

Number of LSA 24. Checksum Sum 0x15AA02

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

BB#sh ip ospf int fa0/0
FastEthernet0/0 is up, line protocol is up
Internet Address 192.168.50.2/31, Area 10
Process ID 100, Router ID 172.30.8.1, Network Type BROADCAST, Cost: 1
Transmit Delay is 1 sec, State BDR, Priority 1
Designated Router (ID) 192.168.50.3, Interface address 192.168.50.3
Backup Designated router (ID) 172.30.8.1, Interface address 192.168.50.2
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
    oob-resync timeout 40
    Hello due in 00:00:01
Supports Link-local Signaling (LLS)
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 2
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
    Adjacent with neighbor 192.168.50.3 (Designated Router)
Suppress hello for 0 neighbor(s)
BB#

BB#sh int fa0/0
FastEthernet0/0 is up, line protocol is up
Hardware is AmdFE, address is 0007.eb7d.eca0 (bia 0007.eb7d.eca0)
Internet address is 192.168.50.2/31
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:06, output 00:00:05, output hang never
Last clearing of "show interface" counters 01:46:31
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
     1335 packets input, 167152 bytes
     Received 782 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog
     0 input packets with dribble condition detected
     2253 packets output, 201658 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out
BB#sh ip ospf
Routing Process "ospf 100" with ID 172.30.8.1
Start time: 2d01h, Time elapsed: 00:08:05.360
Supports only single TOS(TOS0) routes
Supports opaque LSA
Supports Link-local Signaling (LLS)
Supports area transit capability
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 0x009838
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 1. 1 normal 0 stub 0 nssa
Number of areas transit capable is 0
External flood list length 0
    Area 10
        Number of interfaces in this area is 1
        Area has no authentication
        SPF algorithm last executed 00:07:16.913 ago
        SPF algorithm executed 1 times
        Area ranges are
        Number of LSA 24. Checksum Sum 0x15AA02
        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

Above is required info as per you request.

I tried this many times since yesterday and router ospf 100 do not work but now suddenly it worked.

i also did clear ip ospf process on both routers few times to make sure its not fluke.

but surprisingly OSPF is working between these 2 routers now.

Regards

MAhesh

Kishore Chennupati · ‎02-19-2012

Mahesh,

Your original config actually has them configured under router ospf 100. so what have you done new?

BB Router

--More-- router ospf 100

log-adjacency-changes

network 192.168.50.0 0.0.0.255 area 10

!

3550

router ospf 100

log-adjacency-changes

network 192.168.50.0 0.0.0.255 area 10

Rgds,

Kishore

mahesh18 · ‎02-19-2012

Hi Kishore,

I idid nothing new .

since yesterday OSPF was not working while using router ospf 100 on both routers

it works fine while using router ospf 1 on both routers.

Here is what i did

As it was working ok under router ospf 1 i did change to router ospf 100 to recreate the problem.

When i do this in past ospf never worked.

but this time ospf nei worked between these 2 routers.

Totally strange

Thanks

MAhesh

Kishore Chennupati · ‎02-19-2012

Mahesh,

interface FastEthernet0/13

no switchport

ip address 192.168.50.3 255.255.255.254 << please change this to .252 on both routers and test

HTH

Kishore