OSPF – Cost

Cost.
The outgoing cost for packets transmitted from this interface. Cost is the OSPF metric, expressed as an
unsigned 16-bit integer in the range of 1 to 65535. Cisco uses a default cost of 10^8/BW, expressed in
whole numbers, where BW is the configured bandwidth of the interface and 10^8 is the reference
bandwidth.If an interface is configured with a  configured bandwidth of 128K , so
the cost is 10^8/128K = 781.
The cost can be changed with the command ip ospf cost. This command is especially important when
configuring Cisco routers in a multivendor environment. If all routers do not
assign costs in the same manner, OSPF can route improperly.

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