RFC 7868, "Cisco's Enhanced Interior Gateway Routing Protocol (EIGRP)", May 2016

Errata ID: 8355
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Mike Harding
Date Reported: 2025-03-28
Verifier Name: Eliot Lear
Date Verified: 2025-04-01

Section 5.6.2.4 says:

   Transmission times derived from physical interfaces MUST be n units
   of picoseconds, converted to picoseconds prior to being exchanged
   between neighbors, or used in the composite metric determination.

   This includes delay values present in configuration-based commands
   (i.e., interface delay, redistribute, default-metric, route-map,
   etc.).

   The delay value is then converted to a "latency" using the formula:

                          Delay * EIGRP_WIDE_SCALE
        Latency = K3 *   --------------------------
                             EIGRP_DELAY_PICO

It should say:

   Transmission times derived from physical interfaces MUST be n units
   of picoseconds, converted to picoseconds prior to being exchanged
   between neighbors, or used in the composite metric determination.

   This includes delay values present in configuration-based commands
   (i.e., interface delay, redistribute, default-metric, route-map,
   etc.).

   The sum of the delay values are then converted to a "latency" using the formula:

                          Delay * EIGRP_WIDE_SCALE
        Latency = K3 *   --------------------------
                             EIGRP_DELAY_PICO

Notes:

It is perhaps useful to reference the point at which the delay values should be summed.

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