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» Routing and Switching Internetworking Experts   » CCIE R&S Lab Scenario Discussion   » Other Lab Scenario Questions   » OSPF "Too Many Retransmission"

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Author Topic: OSPF "Too Many Retransmission"
WolfieRoc
Specialist

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posted August 02, 2007 04:05 AM      Profile for WolfieRoc     Send New Private Message      Edit/Delete Post  Reply With Quote 
Here is the situation. On a ethernet segment, 2 routers and a switch all running OSPF. 1 router is DR and was statically chosen(ip ospf priority command) and even with the using the ip ospf mtu-ignore under all 3 interfaces I cannot get a full adjacency on the switch. I get a message of "..EXSTART to DOWN, Neighbor Down: Too many retransmissions". Any ideas?
Posts: 52 | From: Salem NH | Registered: Mar 2003  |  IP: Logged
Darrell A Escola
Guru

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posted August 02, 2007 05:58 PM      Profile for Darrell A Escola     Send New Private Message      Edit/Delete Post  Reply With Quote 
WolfieRoc,

It sounds to me like there is a connectivity problem that is dropping packets, making it necessary to re-transmit. Check layer 2 for possible duplex mismatch and check interfaces for error statistics.

Darrell

Posts: 115 | From: Clovis, California | Registered: Jul 2006  |  IP: Logged
Hasan
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posted November 09, 2008 10:22 PM      Profile for Hasan     Send New Private Message      Edit/Delete Post  Reply With Quote 
Hi You should Check your MTU. It is defiantly one o the labs where you created a tunnel and changed the system mtu to 1500. in ospf you will have to give the command ip ospf mtu-ignore. please try this and let me know
Posts: 17 | From: Mumbai, India | Registered: Oct 2008  |  IP: Logged
sau
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posted November 30, 2008 11:11 AM      Profile for sau     Send New Private Message      Edit/Delete Post  Reply With Quote 
ya Hasan is right about that ip ospf mtu-ignore will definitely solve your issue !
Posts: 9 | From: Bangalore,india | Registered: Nov 2008  |  IP: Logged


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