By default, ENA utilization metrics use values that are retrieved from managed devices to identify their capability. However, these might not always be correct.
For example, in Frame Relay environments, port line speed and DLC CIRs are usually set within equipment that is external to the managed routers, and the values returned by the routers are manually configured by network administrators. Because of this dependence on manually setting device values, there is scope for inaccuracy through adminstrators:
- entering incorrect values.
- not changing the settings from their factory-shipped defaults.
- setting values once, but then failing to update them as the line speeds or CIRs are changed.
- deliberately setting bandwidth statements to values other than the real line speeds, to influence routing behavior.
Entuity recommends that administrators validate that the line speeds ENA discovers are a true reflection of the network, particularly WAN port and Frame Relay DLCI CIR line speeds.