EIGRP UPDATE

Hi people,

I have problems understanding the process of EIGRP update.  A word containing document to a Wireshark capture screenshots, is attached.  Please, take a look at them and offer your thought.  Thank you.

Hello.

Draft RFC Cisco recently released for EIGRP, where you can find all the answers - https://www.ietf.org/id/draft-savage-eigrp-04.txt

Basically:

  • section 5.3.3 - 4 says about INIT-flag to start the process of initial update (NULL INIT-package);
  • next hop is 0.0.0.0 - means we use Neighbor IP address as the next hop (that we can announce another figuring the next hop IP address);
  • update of unicast retransmission may come, 192.168.1.2 did not recognize multicast update (in this case, we spend in unicast mode).

Ps1: I would say that you are testing EIGRP on 15.2 + free, as the project is most likely covers the latest version.

PS2: If you repeat the test with 15.2 + version, please attach file OCAP and your questions.

Tags: Cisco Network

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