OSPF Network Type – Point-to-Multipoint

Points to remember about Point-to-Multipoint OSPF network type.

1. No Designated Router (DR) and Back Designated Router(BDR) election. 2. Uses multicast to send OSPF hello. 3. Changes next-hop IP address. 4. Advertises /32 host route instead of a network route. 5. All routers in the segment must agree on the network type.

L0:10.0.0.1/24 L0:20.0.0.2/24 Spoke […]

OSPF Network Type – Point-to-Point

Points to remember about Point-to-Point OSPF network type.

1. No Designated Router (DR) and Back Designated Router(BDR) election. 2. Uses multicast to send OSPF hello. 3. Default network type on HDLC, PPP and point-to-point NBMA. 4. Only supports adjacency of two neighbors on a segment.

S0/1 .—–. 12.0.0.2/30 .—–. | R01 |< --------------------->| R02 | […]

OSPF Network Type – Non-Broadcast

Points to remember about Non-Broadcast OSPF network type.

1. Designated Router (DR) and Back Designated Router(BDR) election occurs. BDR sends LS to multicast address 224.0.0.6 which is the DR and DR sends LS to multicast address 224.0.0.5 which is all routers within the area. 2. No pre-emption meaning when the DR goes down, BDR takes […]

OSPF Network Type – Broadcast

Points to remember about Broadcast OSPF network type.

1. Designated Router (DR) and Back Designated Router(BDR) election occurs. BDR sends LS to multicast address 2240.0.6 which is the DR and DR sends LS to multicast address 224.0.0.5 which is all routers within the area. 2. No pre-emption meaning when the DR goes down, BDR takes […]