H3C Technologies H3C S10500 Series Switches - Manual (Page 95)

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• When an NBMA network becomes fully meshed through address mapping—any two routers in the
network have a direct virtual circuit in between, you can change the network type to broadcast to
avoid manual configuration of neighbors.
• When some routers in the broadcast network do not support multicast, you can change the network
type to NBMA.
• An NBMA network must be fully meshed. If it is partially meshed, you can change the network type
to P2MP to simplify configuration and save network costs.
• If a router on an NBMA network has only one neighbor, you can change the network type to P2P
to save network costs.
If two interfaces on a link are both configured as the broadcast, NBMA, or P2MP network type, they
cannot establish a neighbor relationship unless they are on the same network segment.
Configuration prerequisites
Before configuring OSPF network types, complete the following tasks:
• Configure IP addresses for interfaces, making neighboring nodes accessible with each other at
network layer
• Configure OSPF basic functions
Configuring the OSPF network type for an interface as
broadcast
Follow these steps to configure the OSPF network type for an interface as broadcast:
To do… Use the command… Remarks
Enter system view system-view —
Enter interface view
interface interface-type
interface-number
—
Configure the OSPF network type
for the interface as broadcast
ospf network-type broadcast
Required
By default, the network type of an
interface depends on the link layer
protocol.
Configure a router priority for the
interface
ospf dr-priority priority
Optional
The default router priority is 1.
Configuring the OSPF network type for an interface as NBMA
After configuring the network type of an interface as NBMA, you must make some special configurations.
Because NBMA interfaces cannot find neighbors via broadcasting hello packets, you must specify
neighbors and their router priorities. (A router priority of 0 means the router does not have the DR election
right. A router priority greater than 0 means the router has the DR election right.)
Follow these steps to configure the OSPF network type for an Interface as NBMA: