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Topic review - Quagga ospf neighbour stuck in ExStart/DROther state
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Post subject: Quagga ospf neighbour stuck in ExStart/DROther state  |  Post Posted: Mon Dec 12, 2011 4:12 pm
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).
quagga-router# sh ip ospf neighbor 

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

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