EIGRP Neighbor and Topology Table Explained

Hi Victor,

EIGRP uses this formula to calculate the metric:

https://networklessons.com/eigrp/eigrp-k-values-formula/

Here is an example of a directly connected gigabit interface with a network that is advertised in EIGRP:

R1#show ip eigrp topology 192.168.12.0/24
EIGRP-IPv4 Topology Entry for AS(1)/ID(11.11.11.11) for 192.168.12.0/24
  State is Passive, Query origin flag is 1, 1 Successor(s), FD is 2816
  Descriptor Blocks:
  0.0.0.0 (GigabitEthernet0/1), from Connected, Send flag is 0x0
      Composite metric is (2816/0), route is Internal
      Vector metric:
        Minimum bandwidth is 1000000 Kbit
        Total delay is 10 microseconds
        Reliability is 255/255
        Load is 1/255
        Minimum MTU is 1500
        Hop count is 0
        Originating router is 11.11.11.11

You can see the metrics that are used for the formula (bandwidth and delay by default) and the FD which is 2816.

Rene

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