Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 877
Generating a Default Route, Summarize Routes, Controlling Route Metrics, FastEthernet 0/0
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Interface FastEthernet 0/0 Routing for Networks: 10.0.0.0 Recv 2 Send 1 2 Routing Information Sources: Gateway Distance Last Update Distance: (default is 120) Dell# Generating a Default Route Traffic is forwarded to the default route when the traffic's network is not explicitly listed in the routing table. Default routes are not enabled in RIP unless specified. Use the default-information originate command in ROUTER RIP mode to generate a default route into RIP. Default routes received in RIP updates from other routes are advertised if you configure the default-information originate command. • Specify the generation of a default route in RIP. ROUTER RIP mode default-information originate [always] [metric value] [route-map route-mapname] - always: Enter the keyword always to always generate a default route. - value The range is from 1 to 16. - route-map-name: The name of a configured route map. To confirm that the default route configuration is completed, use the show config command in ROUTER RIP mode. Summarize Routes Routes in the RIPv2 routing table are summarized by default, thus reducing the size of the routing table and improving routing efficiency in large networks. By default, the autosummary command in ROUTER RIP mode is enabled and summarizes RIP routes up to the classful network boundary. If you must perform routing between discontiguous subnets, disable automatic summarization. With automatic route summarization disabled, subnets are advertised. The autosummary command requires no other configuration commands. To disable automatic route summarization, enter no autosummary in ROUTER RIP mode. NOTE: If you enable the ip split-horizon command on an interface, the system does not advertise the summarized address. Controlling Route Metrics As a distance-vector protocol, RIP uses hop counts to determine the best route, but sometimes the shortest hop count is a route over the lowest-speed link. To manipulate RIP routes so that the routing protocol prefers a different route, manipulate the route by using the offset command. Routing Information Protocol (RIP) 877
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