![]() ![]() ![]() You can configure the network type for an OSPF interface to forcibly change its original network type. Therefore, the difference between OSPF configurations on different networks lies in the different packet sending configurations. Instead, a P2MP network must be forcibly changed from another type of network.Īs shown in the preceding table, OSPF sends packets in different ways depending on the specific type of network. OSPF does not regard a network as a P2MP network by default regardless of any link layer protocol. ![]() The mask lengths of the devices on the P2MP network must be the same. On a P2MP network, Hello packets are multicast DD, LSR, LSU, and LSAck packets are unicast. If the link layer protocol is either Point-to-Point Protocol (PPP) or LAPB, OSPF regards the network as a P2P network by default. On a P2P network, Hello, DD, LSR, LSU, and LSAck packets are multicast. That is, any two devices on the network must be directly reachable. On an NBMA network, Hello, DD, LSR, LSU, and LSAck packets are unicast. If the link layer protocol is either Ethernet or Fiber Distributed Data Interface (FDDI), OSPF regards the network as a broadcast network by default. On a broadcast network, Hello, LSU, and LSAck packets are multicast DD and LSR packets are unicast. Table 5-26 Network types supported by OSPF ![]()
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