Fast-switching is the default (per destination). (ip route-cache command)
You can disable per-destination and do process-switched (per packet; hits CPU) by doing 'no ip route-cache' on the interface.
CEF is the recommended method to use nowadays. You enable it globally with 'ip cef' and by default it does per-destination. you can configure CEF to do per-packet with 'ip load-sharing per-packet' on the interface.
IOS will equal cost route across 4 paths by default. This can be increased to a max of 6 however. With EIGRP you can use the variance command to do unequal load balancing across multiple paths.
Thanks for your response. A follow up question. Does the destination router have to have the same configuration? If not, how does the destination router know in what order the received packets should be reordered?. Sequence numbers? Thanks.
Regarding your follow up question, the destination router works according to its configuration. But its better you have same configuration (like CEF) on all your routers, this helps in case you are running VoIP or Video applications.
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