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RE: IP OSPF neigh stuck in 2WAY posted 08/22/2007
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If the task doesn't say don't do it, I always run "ip ospf mtu-ignore"
around the switches!

LOL they often have a 1514 svi mtu, or 1504 system mtu when running
l2tp-tunneling. 99% I run this as a best practice. If ever a task doesn't
allow it, then just adjust the ip mtu on the svi, etc. of the switch.

-Joe

-----Original Message-----
From: nobody@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx] On Behalf Of
ISolveSystems
Sent: Wednesday, August 22, 2007 6:39 PM
To: Cisco certification
Subject: IP OSPF neigh stuck in 2WAY

Hello expert,

R5(FA0/1) and R4(Fa0/0) are in VL45 as well as SW3 and SW4.  For some
reason, R4 and R5 stuck in two way.  All the others neighbor up.  I have
turned on debugging and check the config and found nothing wrong.

Any idea?

Rack1R5(config-if)#do sh ip osp nei

Neighbor ID     Pri   State           Dead Time   Address         Interface
150.1.4.4         0   FULL/  -           -        129.1.54.4
Serial0/0/0.54
150.1.4.4         1   2WAY/DROTHER    00:00:39    129.1.45.4
FastEthernet0/1
150.1.9.9         1   FULL/DR         00:00:32    129.1.45.1
FastEthernet0/1
150.1.10.10       1   FULL/BDR        00:00:38    129.1.45.2
FastEthernet0/1
150.1.8.8         1   FULL/DR         00:00:34    129.1.58.8
FastEthernet0/0
Rack1R5(config-if)#

Rack1R4#sh ip osp nei

Neighbor ID     Pri   State           Dead Time   Address         Interface
150.1.5.5         0   FULL/  -           -        129.1.54.5
Serial0/0/0.54
150.1.6.6         1   FULL/BDR        00:00:34    129.1.46.6
FastEthernet0/1
150.1.5.5         1   2WAY/DROTHER    00:00:31    129.1.45.5
FastEthernet0/0
150.1.9.9         1   FULL/DR         00:00:37    129.1.45.1
FastEthernet0/0
150.1.10.10       1   FULL/BDR        00:00:33    129.1.45.2
FastEthernet0/0
Rack1R4#

Rack1SW3(config-if)#do sh ip osp nei

Neighbor ID     Pri   State           Dead Time   Address         Interface
150.1.4.4         1   FULL/DROTHER    00:00:35    129.1.45.4      Vlan45
150.1.5.5         1   FULL/DROTHER    00:00:32    129.1.45.5      Vlan45
150.1.10.10       1   FULL/BDR        00:00:34    129.1.45.2      Vlan45
150.1.10.10       0   FULL/  -        00:00:34    129.1.34.10
Port-channel34
Rack1SW3(config-if)#

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