3Com SuperStack II, NETBuilder SI manual Override Option, To enable Ospf on a specified port, use

106CHAPTER 8: CONFIGURING BRIDGING AND ROUTING

This command adds the address 130.10.112.0 with subnet mask 255.255.255.0 to the routing table.

Override Option

If a destination network is reachable with both a static route and a learned route, the router uses the static route unless you specify the optional Override value in the ADD ROUte command. In that case, if a learned route is available to the same network, regardless of metric, it overrides the static route. You should specify Override for a path you want to use for route redundancy. The Override value is entered at the end of the command.

To add the same static route as described earlier with the Override value included, enter:

ADD -IP ROUte 130.10.112.0 255.255.255.0 130.10.109.5 3 Override

Learning Routes OSPF is a dynamic routing protocol that creates routing tables

with OSPF automatically. For information about other dynamic routing protocols like RIP, see Using Enterprise OS Software.

Every 30 minutes or every time the router learns a route change for a network, it uses multicast packets to report to its neighbors the following types of information:

■The networks and the directly connected routers

■The metric associated with each directly connected router and network

In an unchanging topology, OSPF only sends updates every 30 minutes while RIP sends updates every 30 seconds. OSPF provides a significant savings in network overhead when compared to RIP.

To enable OSPF on a specified port, use:

SETDefault !<port> -OSPF CONTrol = Enable

After OSPF is enabled, the router exchanges routing information with other routers using OSPF.

For more information about fine-tuning your OSPF configuration, see

Using Enterprise OS Software.