Command Reference Guide

220 ● ospf network-type 3Com Router 5000 Family and Router 6000 Family
Command Reference
ospf network-type
Purpose Use the ospf network-type command to configure the network type of OSPF
interface.
Use the undo ospf network-type command to restore the default network
type of the OSPF interface.
Syntax ospf network-type { broadcast | nbma | p2mp | p2p }
undo ospf network-type
Parameters broadcast
Changes the interface network type to broadcast.
nbma
Changes the interface network type to Non-Broadcast
Multicast Access.
p2mp
Changes the interface network type to
point-to-multipoint.
p2p
Changes the interface network type to point-to-point.
Example Set the interface serial1/0/0 to NBMA type.
[3Com ] interface serial1/0/0
[3Com -serial1/0/0] ospf network-type nbma
View This command can be used in the following views:
■ Interface view
Description OSPF divides networks into four types by link layer protocol:
■ Broadcast: If Ethernet is adopted, OSFP 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 if the NBMA network is not
fully-meshed.
■ Point-to-point (p2p): If PPP or LAPB is adopted, OSPF defaults the network type to
p2p.
If there is a router not supporting multicast address on the broadcast network, the
interface network type can be changed to NBMA. The interface network type can
also be changed from NBMA to broadcast.
A network that can be called an NBMA network or can be changed to a broadcast
network should satisfy the following condition: there is a virtual circuit directly