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Quagga ospf neighbour stuck in ExStart/DROther state
https://forum.ivorde.com/quagga-ospf-neighbour-stuck-in-exstart-drother-state-t1004.html
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Author:  debuser [ Mon Dec 12, 2011 4:12 pm ]
Post subject:  Quagga ospf neighbour stuck in ExStart/DROther state

After setting up ospf over gre over ipsec, I noticed that the neighbours were stuck in "ExStart/DROther" state. This was because I adjusted the MTU only on one tunnel end-point (MTU adjustment is necessary for GRE and IPsec encapsulation).
Code:
quagga-router# sh ip ospf neighbor 

    Neighbor ID Pri State           Dead Time Address         Interface            RXmtL RqstL DBsmL
172.16.0.34     128 Full/DROther       5.573s 172.16.0.41     tun0:172.16.0.42         0     0     0
172.16.0.5        1 ExStart/DROther    4.140s 172.16.0.45     tun1:172.16.0.46         0     0     0


Setting the same MTU value on both GRE endpoints fixed the issue.

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