Hi community,
I found out something interesting in cloudshark and I even saw this in my GNS3 Lab I did when I traced neighbor adjacency.
Seems like that the initial Update Packet is Unicasted to it’s Neighbor after receiving a Hello Packet but that Update at that time doesn’t contain any Network Information, only a Flag is set (Init Flag).
The receiver of this seems to Acknowledge this Unicast Update Packet but not with an ACK as i thought it actually will use a Update Packet with the same Flag and also no information about the network yet.
Now the most confusing point is that the actual “Full Update” with all Network Information is sent as Multicast to all EIGRP Listeners (224.0.0.10) with a new Sequence number but later on it is also sent again as Unicast.
The full trace is here:
https://www.cloudshark.org/captures/bdcc74327b71
Can someone explain this trace to me ?
Best regards,
Marcel