A parks department runs OSPF over DMVPN mGRE and needs stable adjac…

Question

A parks department runs OSPF over DMVPN mGRE and needs stable adjacencies without treating the overlay like a broadcast LAN full of unexpected DR elections. Which approach is most appropriate?

Accepted Answer

Choose an OSPF network type suited to the hub-spoke mGRE model (commonly point-to-multipoint) so adjacencies form without fragile broadcast DR assumptions — OSPF network type on mGRE is the seating chart: pick point-to-multipoint (typical for hub-spoke) so you are not electing a DR across a fake broadcast cloud over the Internet. Wrong network type means flapping adjacencies and parks WAN pain.

Answer

Force OSPF broadcast network type on every spoke and rely on the highest router ID as a permanent DR across the Internet underlay

Answer

Disable OSPF hellos on the tunnel and use LDP between spokes instead

Answer

Map OSPF areas one-to-one with MPLS RTs so adjacency state follows VPN import policy

A parks department runs OSPF over DMVPN mGRE and needs stable adjacencies without treating the overlay like a broadcast LAN full of unexpected DR elections. Which approach is most appropriate?

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