9 questions on "EIGRP - EIGRP Metrics, Packets, and Adjacencies - EIGRP Packets"

What are the 7 different types of EIGRP packets
  • Hello
  • Acknowledgement packets
  • Update packets
  • Query packets
  • reply packets
  • SIA-Query packets
  • SIA-Reply packets
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Which EIGRP packets are unreliable?
  • Hello
  • Acknowledgement packets
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What is the command for statitics about send and revieved EIGRP packets?

R1#sh ip eigrp traffic
EIGRP-IPv4 Traffic Statistics for AS(1)
  Hellos sent/received: 5/4
  Updates sent/received: 3/2
  Queries sent/received: 0/0
  Replies sent/received: 0/0
  Acks sent/received: 2/1
  SIA-Queries sent/received: 0/0
  SIA-Replies sent/received: 0/0
  Hello Process ID: 153
  PDM Process ID: 137
  Socket Queue: 0/10000/2/0 (current/max/highest/drops)
  Input Queue: 0/2000/2/0 (current/max/highest/drops)
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What multicast address do the EIGRP hello packets use?
IPv4 224.0.0.10
IPv6 FF02::A
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What is the function of an EIGRP Acknowledgement packet?
To acknowledge selected received EIGRP packets to facilitate their reliable delivery.
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How does the EIGRP ACK packet look like?
Like a hello packet (empty body), with no TLV's, carrying the common EIGRP packet header.
The acknowledgement field is set to non-zero. This non-zero value is set to the Sequence number of the reliable packet being acknowledged.
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What does te EIGRP message Update consist?
Informs neighbors about updated routing information
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What is the function of a SIA query in EIGRP?
To ask the neighbor for confirmation that it is still working on the original query.
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What is the function of a SIA Reply in EIGRP?
If the neighbor is reachable and is till engaged in the diffusing computation of the destination specified in the SIA-query, it will immediately respond with an SIA-reply packet
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