OSPF Network Types
OSPF Representation of routers and networks
| CLI | Network Types | LSA Type 1 or 2 | Use-case |
|---|---|---|---|
ip ospf network broadcast | Broadcast | 2 - DR Election | Ethernet, Token Ring, FDDI |
ip ospf network non-broadcast | NBMA | 2 - DR Election | X.25, frame-relay, ATM. Requires a full-mesh. |
ip ospf network point-to-point | Point-To-Point | 1 - No DR | Serial links, Unnumbered, TDM, HDLC, PPP (Full Adjacency) |
ip ospf network point-to-multipoint | Hub and Spoke on Ethernet | 1 - No DR | Hub and Spoke Topologies, like DMVPN or Frame Relay |
Moy Standards Track [Page 13]
RFC 2328 OSPF Version 2 April 1998
**FROM**
* |RT1|RT2|
+---+Ia +---+ * ------------
|RT1|------|RT2| T RT1| | X |
+---+ Ib+---+ O RT2| X | |
* Ia| | X |
* Ib| X | |
Physical point-to-point networks
**FROM**
+---+ *
|RT7| * |RT7| N3|
+---+ T ------------
| O RT7| | |
+----------------------+ * N3| X | |
N3 *
Stub networks
**FROM**
+---+ +---+
|RT3| |RT4| |RT3|RT4|RT5|RT6|N2 |
+---+ +---+ * ------------------------
| N2 | * RT3| | | | | X |
+----------------------+ T RT4| | | | | X |
| | O RT5| | | | | X |
+---+ +---+ * RT6| | | | | X |
|RT5| |RT6| * N2| X | X | X | X | |
+---+ +---+
Broadcast or NBMA networks