Put on the interfaces to be used as one of the fields when routing protocol calculates the best path if not given it takes the defualt speed of the port or the speed of the link which ever is less by default .
So I have 2 serial connections with the same bandwidth it will load balance right, If I change this statement to a higher bandwidth will it use that link or would it un-equal cost load balance ?
The bandwidth command certainly does not change the physical characteristics of the interface or affect the actual throughput of the interface.
In addition to routing protocols that use bandwidth in their calculation of metrics (EIGRP and OSPF) the bandwidth (configured or default) is used to calculate the load on the interface. Anyone who monitors load of interfaces (gathered by show command, or by SNMP for network reporting and things like MRTG) should be careful that the bandwidth assigned to the interface is realistic.
If you change the configured bandwidth it may change the calculated EIGRP metric.
For several reasons I believe that if you want to change the EIGRP calculated metric it is better to manipulate the interface delay.
An interface of a router bydefault uses only 75% of available bandwith on a router.
bandwidth command enables a router to utilize the bandwidth specified in the statement.
For example you have a 2mb link, the statement would be
Pls rate if works.