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DES-7200 Configuration Guide Chapter 4 OSPF
Configuration
4-8
The point-to-multipoint network interface can be seen as the marked
point-to-point interface of one or multiple neighbors. When the OSPF is
configured as the point-to-multipoint network type, multiple host routes will be
created. The point-to-multipoint network has the following advantages over the
NBMA network:
Easy configuration without the configuration of neighbors or the election of
the designated router.
Small cost without the need of fully meshed topology
To configure the network type, execute the following commands in the interface
configuration mode:
Command Function
DES-7200(config-if)# ip ospf network
{broadcast | non-broadcast |
point-to-point | {point-to-multipoint
[non-broadcast]} }
Configure the OSPF network type.
For different link encapsulation types, the default network type is shown as below:
Point-to-point network type
PPP, SLIP, frame relay point-to-point sub-interface, X.25 point-to-point
sub-interface encapsulation
NBMA (non-broadcast) network type
Frame relay, X.25 encapsulation (except point-to-point sub-interface)
Broadcast network type
Ethernet encapsulation
The default type is not the point-to-multipoint network type
It should be noted that the network type should be consistent at both sides.
Otherwise, the abnormality will occur, for instance, the neighbor is Full and the
calculation of the routing is incorrect.
4.2.3.1 Configuring Point-to-Multipoint
Broadcast Network
When routers are connected via X.25 and frame relay networks, if the network is
not a fully meshed network or you do not want the election of the designated
router, you can set the network type of the OSPF interface as the
point-to-multipoint type. Since the point-to-multipoint network sees the link as a
point-to-point link, multiple host routes will be created. In addition, all the
neighbors have the same cost in the point-to-multiple networks. If you want to
make different neighbors have different costs, you can set them by using the
neighbor command.