Dell Force10 E1200i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 828

www.dell.com | support.dell.com Generate 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 the ROUTER RIP mode to generate a default route into RIP. In FTOS, default routes received in RIP updates from other routes are advertised if the default-information originate command is configured. To configure FTOS to generate a default route, use the following command in the ROUTER RIP mode: Command Syntax default-information originate [always] [metric value] [route-map route-map-name] Command Mode ROUTER RIP Purpose Specify the generation of a default route in RIP. Configure the following parameters: • always: enter this keyword to always generate a default route. • value range: 1 to 16. • route-map-name: name of a configured route map. Use the show config command in the ROUTER RIP mode to confirm that the default route configuration is completed. 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 the 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 command autosummary requires no other configuration commands. To disable automatic route summarization, in the ROUTER RIP mode, enter no autosummary. Note: If the ip split-horizon command is enabled on an interface, then the system does not advertise the summarized address. Control 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, you must manipulate the route by using the offset command. Exercise caution when applying an offset command to routers on a broadcast network, as the router using the offset command is modifying RIP advertisements before sending out those advertisements. 828 | Routing Information Protocol