HP 6125XLG R2306-HP 6125XLG Blade Switch Layer 3 - IP Routing Configuration Gu - Page 71

• Broadcast-When the link layer protocol is Ethernet or FDDI, OSPF classifies the network type as broadcast by default. • NBMA-When the link layer protocol is Frame Relay, ATM, or X.25, OSPF classifies the network type as NBMA by default. • P2P-When the link layer protocol is PPP, LAPB, or HDLC, OSPF classifies the network type as P2P by default. When you change the network type of an interface, follow these guidelines: • When an NBMA network becomes fully meshed, change the network type to broadcast to avoid manual configuration of neighbors. • If any routers in a broadcast network do not support multicasting, change the network type to NBMA. • An NBMA network must be fully meshed. OSPF requires that an NBMA network be fully meshed. If a network is partially meshed, change the network type to P2MP. • If a router on an NBMA network has only one neighbor, you can change the network type to P2P to save costs. Two broadcast-, NBMA-, and P2MP-interfaces can establish a neighbor relationship only when they are on the same network segment. Configuration prerequisites Before you configure OSPF network types, complete the following tasks: • Configure IP addresses for interfaces to ensure IP connectivity between neighboring nodes. • Enable OSPF. Configuring the broadcast network type for an interface Step 1. Enter system view. 2. Enter interface view. Command system-view interface interface-type interface-number Remarks N/A N/A 3. Configure the OSPF network type for the interface as broadcast. ospf network-type broadcast By default, the network type of an interface depends on the link layer protocol. 4. (Optional.) Configure a router priority for the interface. ospf dr-priority priority The default router priority is 1. Configuring the NBMA network type for an interface After you configure the network type as NBMA, you must specify neighbors and their router priorities because NBMA interfaces cannot find neighbors by broadcasting hello packets. To configure the NBMA network type for an interface: 60