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    Port Utilization

    Port utilization is derived from historical PM counters. In order to view the utilization, you must enable historical PMs on the network elements that you want to monitor.

    Port utilization is a measure of the amount of traffic on a link or a LAG relative to the link's or LAG's capacity over a period of time. The period over which the proNX Service Manager Dashboard reports a single utilization measurement is 15 minutes. This coincides with the 15-minute bins collected for performance monitoring, and it provides a meaningful measure by smoothing out the instantaneous bursts while providing sufficient granularity suitable for historical analysis.

    Port utilization is supported for the following ports:

    • GE, 10GE, and LAG ports on BTI7000 Series PVX modules.
    • GE, 10GE, and LAG ports on BTI800 Series devices.

    Port Utilization on Individual Links

    The port utilization for individual full duplex links (and individual LAG members) is determined as follows:

    • The transmitted and received octets in the 15-minute bins for the past 7 days are examined for the specified port.
    • The representative octet count for each 15-minute bin is determined. The representative octet count is the higher of the transmitted octet count and the received octet count for that bin. For example, if a 15-minute bin contains a transmitted octet count of 30000 and a received octet count of 1300, then the transmitted octet count of 30000 is used to represent this 15-minute bin.
    • The per-bin port utilization is calculated for all 15-minute bins, as follows:

      where octet_count is the representative octet count for that bin.

      The per-bin port utilizations are graphed and displayed in the Port Summary panel. (If the port is a LAG member, the per-bin port utilizations are also used to determine the LAG port utilization.)

    • From this list of per-bin port utilizations, the minimum, maximum, and average port utilizations are determined:
      • The minimum port utilization is the lowest per-bin port utilization from this list.
      • The maximum port utilization is the highest per-bin port utilization from this list.
      • The average port utilization is the average of all per-bin port utilizations from this list.

      The minimum, maximum, and average port utilizations are shown in the port utilization table.

    Port Utilization on LAGs

    The port utilization for a LAG is calculated based on the port utilizations of its members, as follows:

    • The per-bin port utilizations are determined for all LAG members.
    • The per-bin LAG port utilization is determined by averaging the per-bin port utilization of each LAG member for the corresponding bins. The corresponding bins are the bins that represent the same 15-minute interval. This calculation results in a list of per-bin LAG port utilizations.

      The per-bin LAG port utilizations are graphed and displayed in the Port Summary panel.

    • From this list of per-bin LAG port utilizations, the minimum, maximum, and average utilizations are determined:
      • The minimum LAG port utilization is the lowest per-bin utilization from this list.
      • The maximum LAG port utilization is the highest per-bin utilization from this list.
      • The average LAG port utilization is the average of all per-bin utilizations from this list.

      The minimum, maximum, and average LAG port utilizations are shown in the port utilization table.

    Modified: 2017-11-07