On 2018-10-15, open...@kene.nu <open...@kene.nu> wrote: > in theory. But when WAN links are composed of IPSEC and GRE (which > does not have link state) OSPF falls to pieces as the core idea of is > link-state.
OSPF primarily uses hellos. Link-state is also used to speed up failover up but is not required. There was a bug in ospfd with DR selection that results in problems (specifically multiple routers thinking they were all DR) after a netsplit if there was no link-state change. This was already fixed though so if you are running 6.3+ and still seeing problems, please send a bug report with some information.
