Computer and Networking:troubleshooting the problems: November 2009

You can create an EIGRP default route with the ip default-network network-number global configuration command. The configured router advertises the specified network listed as the gateway of last resort. Other routers use their next-hop address to the advertised network as their default route.

The network specified must be reachable by the router before it announces the network as a candidate default route to other EIGRP routers. The network must also be passed to other EIGRP routers so that those routers can use this network as their default network and gateway of last resort. Therefore, the network must be either an EIGRP-derived network in the routing table or generated using a static route that has been redistributed into EIGRP.
Multiple default networks can be configured. Downstream routers use the EIGRP metric to determine the best default route

Cable Type               Bandwidth                    Maximum Length            Cost

CAT 5 UTP             10Mbps to 100Mbps         100 meters            Inexpensive

Thinnet                     10Mbps                             185 meters            Inexpensive

Thicknet                   10Mbps                             500 meters            Expensive

Fiber optic             100Mbps to 2Gbps+           2 kilometers            Expensive

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