H3C s3600 series Command Manual page 360

View
Interface view
Parameters
broadcast: Specifies the network type as broadcast.
nbma: Specifies the network type as NBMA.
p2mp: Specifies the network type as point-to-multipoint.
unicast: Sends packets to unicast addresses.
p2p: Specifies the network type as point-to-point.
Description
Use the ospf network-type command to configure the network type for an interface.
Use the undo ospf network-type command to restore the default network type.
OSPF divides networks into four types based on link layer protocol:
Broadcast: If Ethernet or FDDI is adopted, OSPF defaults the network type to broadcast.
Non-Broadcast Multi-access (NBMA): If Frame Relay, ATM, HDLC or X.25 is adopted, OSPF
defaults the network type to NBMA.
Point-to-Multipoint (P2MP): OSPF will not default the network type of any link layer protocol to
P2MP. The general undertaking is to change a partially connected NBMA network to P2MP
network.
Point-to-point (P2P): If PPP, LAPB or POS is adopted, OSPF defaults the network type to P2P.
If there is any router not supporting multicast addresses on a broadcast network, the network type of the
interface can be changed to NBMA.
For a non-broadcast multi-accessible network to be of NBMA type, any two routers in the network must
be directly reachable to each other through a virtual circuit. In other words, the network must be
fully-meshed.
For a network not meeting this condition, the network type of the interface must be changed to
point-to-multipoint. In this way, routing information can be exchanged between two routers not directly
reachable to each other through another router that is directly reachable to the two routers.
If only two routers run OSPF in the same network segment, the network type of the interface can also be
changed to point-to-point.
For a P2MP interface,
If the unicast keyword is not specified, the interface sends packets to multicast addresses.
If the unicast keyword is specified, the interface sends packets to unicast addresses. In this case,
you must use the peer command to specify the neighbor.
Note that you must use the peer command to configure the peer if the network type of the interface is
NBMA or manually changed to NBMA with the ospf network-type command.
Related commands: ospf dr-priority.
Examples
# Set the network type of the interface VLAN-interface 10 to NBMA.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
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