Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 593
Summarize routes, Control route metrics, Exercise caution when applying an
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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. The distance command also allows you to manipulate route metrics. Use the command to assign different weights to routes so that the ones with the lower weight or administrative distance assigned are preferred. To set route metrics, use either of the following commands in the ROUTER RIP mode: Command Syntax distance weight [ip-address mask [access-list-name]] offset access-list-name {in | out} offset [interface] Command Mode Purpose ROUTER RIP Apply a weight to all routes or a specific route and ACL. Configure the following parameters: • weight range: 1 to 255 (default is 120) • ip-address mask: the IP address in dotted decimal format (A.B.C.D), and the mask in slash format (/x). • access-list-name: name of a configured IP ACL. ROUTER RIP Apply an additional number to the incoming or outgoing route metrics. Configure the following parameters: • access-list-name: the name of a configured IP ACL • offset range: 0 to 16. • interface: the type, slot, and number of an interface. Use the show config command in the ROUTER RIP mode to view configuration changes. Routing Information Protocol | 593
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