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Alcatel and Cisco OSPF

phamthecong
Level 1
Level 1

hi All,

We run OSPF between Alcatel and Cisco 3560. Cisco 3560 router is stuck in the INIT/DROTHER state. We capture packets from those two routers and find out that Alcatel router does not send Cisco 3560 Router ID back to 3560.

is there anyone know how to fix this issue?

regards.

18 Replies 18

pkhatri
Level 11
Level 11

It appears that the Alcatel router is not seeing the Hellos from the 3560.

Can you confirm that the two devices can ping each other ?

Paresh

Yes, They can ping each other.

debug ip os adj as below:

Feb 16 11:50:44: OSPF: Interface GigabitEthernet0/1 going Down

Feb 16 11:50:44: OSPF: 10.55.255.21 address 10.48.1.2 on GigabitEthernet0/1 is dead, state DOWN

Feb 16 11:50:44: OSPF: Neighbor change Event on interface GigabitEthernet0/1

Feb 16 11:50:44: OSPF: DR/BDR election on GigabitEthernet0/1

Feb 16 11:50:44: OSPF: Elect BDR 0.0.0.0

Feb 16 11:50:44: OSPF: Elect DR 0.0.0.0

Feb 16 11:50:44: OSPF: Elect BDR 0.0.0.0

Feb 16 11:50:44: OSPF: Elect DR 0.0.0.0

Feb 16 11:50:44: DR: none BDR: none

Feb 16 11:50:44: OSPF: Flush network LSA immediately

Feb 16 11:50:44: OSPF: Remember old DR 10.55.255.21 (id)

Feb 16 11:50:44: OSPF: 10.49.127.2 address 10.48.1.1 on GigabitEthernet0/1 is dead, state DOWN

Feb 16 11:50:44: %OSPF-5-ADJCHG: Process 1, Nbr 10.49.127.2 on GigabitEthernet0/1 from INIT to DOWN, Neighbor Down: Interface down or detached

Feb 16 11:50:44: OSPF: Neighbor change Event on interface GigabitEthernet0/1

Feb 16 11:50:44: OSPF: DR/BDR election on GigabitEthernet0/1

Feb 16 11:50:44: OSPF: Elect BDR 0.0.0.0

Feb 16 11:50:44: OSPF: Elect DR 0.0.0.0

Feb 16 11:50:44: DR: none BDR: none

Feb 16 11:50:44: OSPF: Interface GigabitEthernet0/1 going Up

Feb 16 11:50:45: OSPF: We are not DR to build Net Lsa for interface GigabitEthernet0/1

Feb 16 11:50:45: OSPF: Build router LSA for area 0.0.0.5, router ID 10.55.255.21, seq 0x80000001

Feb 16 11:50:48: OSPF: end of Wait on interface GigabitEthernet0/1

Feb 16 11:50:48: OSPF: DR/BDR election on GigabitEthernet0/1

Feb 16 11:50:48: OSPF: Elect BDR 10.55.255.21

Feb 16 11:50:48: OSPF: Elect DR 10.55.255.21

Feb 16 11:50:48: OSPF: Elect BDR 0.0.0.0

Feb 16 11:50:48: OSPF: Elect DR 10.55.255.21

Feb 16 11:50:48: DR: 10.55.255.21 (Id) BDR: none

Feb 16 11:50:49: OSPF: No full nbrs to build Net Lsa for interface GigabitEthernet0/1

thanks

Could you confirm that the Cisco router is including the Alcatel router's Router ID in the Hellos that it sends ?

If so, there could be a problem with transmission of multicast traffic in the Cisco to Alcatel direction. Could you ping 224.0.0.5 from your Cisco box (on your ethernet interface) and see if you get a response from the Alcatel device ?

Paresh

I am sitting on cisco 3560 router, and do " ping 224.0.0.5" I dont get any response from Alcatel router.

I also have a 3550, I put it in and it can form a neighbor with alcatel.

The difference in the Hello packet from Cisco 3560 and 3550 is that

On 3550: ...0....: (EA) Suppress External-Attributes-LSA Handling = False

On 3560: ...1....: (EA) Suppress External-Attributes-LSA Handling = True

do you know how to set it off.

thanks

The fact that a ping to 224.0.0.5 is not working seems to suggest that it is not an OSPF issue. You have to resolve the underlying issue of why multicast traffic is not getting to the Alcatel router from the Cisco 3560 router ? Have you got any config on the 3560 that filters out multicast traffic ? Could you post the config you have ?

BTW, the above difference in the Hello packet should not be an issue...

Paresh,.

On 3560, I just config ip address on interface and ospf process, nothing else.

do you have any recommand on multicast issue?

I'm at a loss here.. Not sure what could be causing this ...

YOu might want to try a different software version on the 3560 just in case that is the issue...

Paresh

i am on the way upgrade IOS, let you know soon

thanks

no luck, after upgrade to new IOS version, problem is still the same.

If it is a multicast issue, can you force the neighbor in the OSPF configuration either sides and check ?

Or you can check this link for any more issues

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f11.shtml#topic1

thanks Attrqautam

I checked that link already. I put 3550 in place of 3560, same config. It works.

connect 3560 to other cisco router, it works.

is there anyone know about OSPF Opaque LSA or External-Attribute-LSA Option in the Hello packet's option field and how to turn on/off that bit.

thanks

Did you try forcing the neighbor to override multicast ?

Have you tried to manually define the neighbor. Use the command

neighbor

Check for an equivalent command on the Alcatel box and configure also.

I will also think that it is a multicast issue, I hope there is nothing like storm-control configured on the interface.

Not certain, but try:

router ospf xxx

no capability opaque

or

router ospf xxx

capability opaque disable

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