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3 Configure CEF

Load balancing is based on a combination of source and destination packet information;

it allows you to optimize resources by distributing traffic over multiple equal-cost

connections for transferring data to a destination. You configure load balancing on

outbound interfaces on a per-destination or per-packet basis.

To enable CEF, use the following command in global configuration mode:

Router(config)# ip cef

Per-destination load balancing is enabled by default when you enable CEF. Typically,

you would disable per-destination load balancing when you want to enable per-packet

load balancing. To disable per-destination load balancing, use the following command

in interface configuration mode:

Router (config-if) # no ip load-sharing per-destination

To enable per-packet load balancing, use the following command in interface

configuration mode:

Router (config-if) # ip load-sharing per-packet

Hash bucket accounting to collect statistics is better to understand Cisco Express

Forwarding patterns in your network. Use the following command to enable it:

Router (config) # ip cef accounting load-balance-hash

Use the use the following commands in privileged EXEC mode to view the path-to-

bucket assignment result from the hash bucket accounting

Router# show ip cef {prefix} internal