Understanding EIGRP #2

prepared by SURAJ (imeansuraj@gmail.com)
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The Metrics used for the calculations of distance to the destination are follows:
  • Load: 1-255 where 255 is the most saturated
  • Reliability: 1-255 where 255 is the most reliable
  • MTU: Maximum Transmission Unit. This is not used for metric calculation.
  • Hop Count: 1-255, by default it is 100, any router above the hop count of 255 is deemed unreachable. This is not used for metric calculation.
  • Bandwidth: this is the width of a channel or channel capacity measured in kilobits.
Understanding EIGRP packets:


  • Hello: EIGRP sends hello packets every 5 seconds on high bandwidth links and every 60 seconds on low bandwidth multipoint links. If it doesn’t receive a hello packet in return it doesn’t establish a connection. Hello intervals can be changed manually through commands. The time it waits after sending a hello is called the hold timer. Normally that time is 3 times that of the hello timer (15 and 180) but if it’s changed then it won’t change to three times to that of the changed one.
  • Update: this packet is only sent when there’s an update available
  • Query: Queries are used to ask neighbours whether they have a path to a route which was recently lost
  • Reply: It is the packet sent in response to the query. It may be reply reachable meaning the route is reachable through the path or reply unreachable meaning the route is unreachable.
(notes compiled and collected from various sources)

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