OSPF issue (EXSTART/DR)

[enriquebs]

HI all,

I have a fiber link between two 7606 routers, the thing is the OSPF isn´t able to change to the FULL state, it stops in the EXSTART. Here is the two interfaces configuration:

interface GE-WAN1/1

mtu 1508

ip address 10.9.129.1 255.255.255.252

ip mtu 1500

ip pim sparse-mode

ip ospf cost 1

no negotiation auto

tag-switching ip

mls qos trust dscp

end

interface GE-WAN2/1

mtu 1508

ip address 10.9.129.2 255.255.255.252

ip mtu 1500

ip pim sparse-mode

no negotiation auto

tag-switching ip

mls qos trust dscp

end

And here an event which is shown all the time if you activate the term mon:

Mar 27 11:55:07: %OSPF-5-ADJCHG: Process 100, Nbr 10.9.128.66 on GE-WAN1/1 from EXSTART to DOWN, Neighbor Down: Too many retransmissions

I thought about any problem in the MTUs config, but they looks fine...

Any idea?

Thanks in advance

[enriquebs]

OK... it seems strange because one hour ago I was able to telnet or ping the router, but not at present... but it's UP because I can reach it via CDP. At present there is layer 2 but not layer 3 connectivity. So... I had the same OSPF issue when I was able to telnet to that router.

[pkhatri]

Hmmm.. if you don't even have layer 3 connectivity to the box, I think you've got bigger issues than OSPF to worry about ....

Are you seeing any errors on the interfaces ? Is there any chance you could get the cabling checked ?

You need to get L3 working properly before you get back to the OSPF problem...

Paresh

[enriquebs]

Yóu are right, I gonna try to get layer 3 connectivity, interface is UP UP and there are no errors in this interface, I´ll try to contact someone to take a look or reset the box.

[enriquebs]

ok... all the devices in that room are shut down right now because of hot problems in the room..... I´ll post something when the boxes will be alive again xD

[enriquebs]

OK, the box is up, we have layer 3 conectivity to the loopback address, but not to the ip address of the interface that is facing to us.

We´ve try to delete all the config in the interfaces but the results are the same, the ospf status is:

DOWN-2WAY-EXSTART but no way to get the FULL status.

Any idea?

[enriquebs]

OK, we think we´re near get layer 3 connectivity, when you shut interface in R1 you can see as the interface in R2 goes down, by the way you can´t see anything with cdp. As you can see the interface configurations seems OK, there are some DWDM devices in the middle of these routers, interfaces have output packets but nothing in the input, and there is no drops...

GE-WAN1/1 is up, line protocol is up

Hardware is GigabitEthernet Interface, address is 0015.c674.5b40 (bia 0015.c674.5b40)

Description: "XXXXX"

Internet address is 10.9.129.1/30

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

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

Encapsulation ARPA, loopback not set

Full-duplex, 1000Mb/s, link type is force-up, media type is LH

output flow-control is unsupported, input flow-control is unsupported

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

Last input 01:45:01, output 00:00:08, output hang never

Last clearing of "show interface" counters 22:45:44

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

0 packets input, 0 bytes, 0 no buffer

Received 0 broadcasts (0 IP multicast)

0 runts, 0 giants, 0 throttles

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

0 watchdog, 0 multicast, 0 pause input

9635 packets output, 1276803 bytes, 0 underruns

0 output errors, 0 collisions, 7 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier, 0 PAUSE output

0 output buffer failures, 0 output buffers swapped out

GE-WAN2/1 is up, line protocol is up

Hardware is GigabitEthernet Interface, address is 0015.c674.6480 (bia 0015.c674.6480)

Description: XXXXXXX

Internet address is 10.9.129.2/30

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

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

Encapsulation ARPA, loopback not set

Full-duplex, 1000Mb/s, link type is auto, media type is LH

output flow-control is unsupported, input flow-control is unsupported

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

Last input 00:16:12, output 00:00:00, output hang never

Last clearing of "show interface" counters 22:46:29

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

0 packets input, 0 bytes, 0 no buffer

Received 0 broadcasts (0 IP multicast)

0 runts, 0 giants, 0 throttles

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

0 watchdog, 0 multicast, 0 pause input

9612 packets output, 1279326 bytes, 0 underruns

0 output errors, 0 collisions, 2 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier, 0 PAUSE output

0 output buffer failures, 0 output buffers swapped out

[Richard Burts]

Enrique

I see that both interfaces are reporting numbers of output packets but report 0 input packets. I think this is a sign that you still have problems with the interfaces, or with the equipment providing the connectivity between them.

Can you clarify your comment about CDP? Is CDP enabled and you see nothing (this would confirm that there are problems on the link) or is CDP not enabled?

HTH

Rick