i am having problem with OSPF.
I have a network of 150 Branch router.
all these branches are available thorugh my fast ethernet interface (my media is MPLS).
i am migrating my network to DMVPN with OSPF, before this i was using GRE tunnel with static routes.
I have migrated 60 routers on it.
all of the are in area 1
when i see show ip ospf nei
I see 7-8 neighbour routers are stuck in exstart state.
i couldn't under stand whats the problem
i have also put ip ospf mtu-ignore.
set the mtu to 1400 on tunnel interface.
Can anybody please help.