Network Router User Manual

Chapter 11: OSPF Configuration Guide
118 SmartSwitch Router User Reference Manual
• Point-to-Point. A point-to-point interface can be a serial line using PPP. By default, an
IP interface associated with a serial line that is using PPP is treated as an OSPF point-
to-point network. If an IP interface that is using PPP is to be treated as an OSPF
broadcast network, then use the type broadcast option of the interface create
command.
• Non-Broadcast Multiple Access (NBMA). An example of a NBMA network is a fully-
meshed Frame Relay or ATM network with virtual circuits. Because there is no general
multicast for these networks, each neighboring router that is reachable over the NBMA
network must be specified, so that routers can poll each other. The SSR will unicast
packets to the routers in the NBMA network.
• Point-to-Multipoint (PMP). Point-to-multipoint connectivity is used when the network
does not provide full connectivity to all routers in the network. As in the case of NBMA
networks, a list of neighboring routers reachable over a PMP network should be
configured so that the router can discover its neighbors.
To configure OSPF for NBMA networks, enter the following command in Configure
mode:
Note:
When you assign an interface with the ospf add interface command, you must
specify type non-broadcast.
To configure OSPF for point-to-multipoint networks, enter the following command in
Configure mode:
Note:
When you assign an interface with the ospf add interface command, you must
specify type point-to-multipoint (instead of type non-broadcast).
Monitoring OSPF
The SmartSwitch Router provides two different command sets to display the various
OSPF tables:
• ospf monitor commands allow you to display the OSPF tables for the router on which
the commands are being entered, as well as for other remote SmartSwitch Routers
running OSPF. The ospf monitor commands can be used to display a concise version
of the various OSPF tables. All of the ospf monitor commands accept a destination
option. This option is only required to display the OSPF tables of a remote SmartSwitch
Router.
Specify an OSPF NBMA
neighbor.
ospf add nbma-neighbor <hostname-or-IPaddr>
to-interface
<name-or-IPaddr> [eligible]
Specify an OSPF point-to-
multipoint neighbor.
ospf add pmp-neighbor <IPaddr> to-interface
<name-or-IPaddr>