EIGRP - EIGRP Metrics, Packets, and Adjacencies - EIGRP Packets

9 important 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

Which EIGRP packets are unreliable?

  • Hello
  • Acknowledgement packets

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)

What multicast address do the EIGRP hello packets use?

IPv6 FF02::A

What is the function of an EIGRP Acknowledgement packet?

To acknowledge selected received EIGRP packets to facilitate their reliable delivery.

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.

What does te EIGRP message Update consist?

Informs neighbors about updated routing information

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.

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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