I've had this issue myself when i was investigating DMVPN using
OpenNHRP.
It's a simple patch to remove the check / enforcement needed in bird,
can't remember where now though since it was a while ago.
When the check was removed i could set the interface to any type i
wanted and i got ospf routing to work.
No drawbacks detected during the testing.
2015-03-02 21:49 skrev Clint Armstrong:
I am trying to use BIRD to run OSPF inside a Phase 3 DMVPN
using OpenNHRP. The problem I'm seeing is that it appears to be
impossible to force type broadcast on a GRE interface. When I try,
the
message "Cannot use interface gre1 as broadcast, forcing nbma" is
logged.
This may normally make sense, but the OpenNHRP daemon captures
multicast traffic on it's interface and forwards it appropriately.
A configuration parameter to bypass this protection and allow
broadcast on a GRE interface would be very helpful.
