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i know that rip do load balances (4 by default) and it is configurable to 6 equal it means that if i want that my one serial link goes downn it shd automatially switch over to other then the path shd b same hopcount??? the AD of rip is 120 how we can change it and in which secnerio we change its AD....and whats the command set for my first question how we configure load balance?? thanks a million in advance



Its usually not recommended to change admin distance. Here is a link how you change it.

If hop count is same, all four routes are installed in routing table. You will see the same route with 4 hops. If one route (interface) fails, it will show the remaining 3 hops. The loadbalancing algorithm used will be depending up on the type of switching configured on the outgoing interface for that particular route. By default most Cisco routers have either fast switching or CEF enabled, which causes packets to be load balanced per-destination. Hence you may see that all 4 routes installed in the routing table will be used for each destination ip address (fast switching) or each source-destination pair (CEF).

You can change the default behaviour to per-packet load balancing by disabling fast switching on the interface (no ip route-cache) but its not recommended. In case of CEF you may use "ip load-sharing per-packet" on each interface to enable per-packet load balancing. This type of LB is not usually recommended if the network is running VOIP. It can cause out-of-order packet delivery.


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