Cabletron Systems 9032578-05 manual Monitoring Ospf

Chapter 11: OSPF Configuration Guide

•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:

Specify an OSPF NBMA neighbor.

ospf add nbma-neighbor <hostname-or-IPaddr>to-interface <name-or-IPaddr>[eligible]

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:

Specify an OSPF point-to- multipoint neighbor.

ospf add pmp-neighbor <IPaddr> to-interface <name-or-IPaddr>

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.

118 SmartSwitch Router User Reference Manual