EIGRP - EIGRP Metrics, Packets, and Adjacencies - EIGRP Packet Format

In the EIGRP packet, what values can the Opcode field have?
1 = Update
3 = Query
4 = Reply
5 = Hello/Ack
10 = SIA Query
11 = SIA Reply
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What is abbreviation for EIGRP TLV and what does it consist? 5
Type-length-value triplets

-EIGRP and TLV versions
-Control information to facilitate reliable multicasting (CR-mode)
-Hold timers
-K-values
-Route reachability information

vochkar
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Of what fields consists the EIGRP Packet
  • Version (always 2)
  • Opcode
  • Checksum
  • Flags
  • Sequence number
  • Acknowledgment Number
  • Virtual Router ID
  • Autonomous system number
  • TLV
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What does the TLV field do?
This field is uesed to carry route entries as well as provide EIGRP DUAL information
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What are the different TLV types:

  • 0x0001 EIGRP Parameters ( General TLV Types )
  • 0x0002 Authentication Type ( General TLV Types )
  • 0x0003 Sequence ( General TLV Types )
  • 0x0004 Software Version ( General TLV Types )
  • 0x0005 Next Multicast Sequence ( General TLV Types )
  • 0x0102 IPv4 Internal Routes ( IP-Specific TLV Types )
  • 0x0103 IPv4 External Routes ( IP-Specific TLV Types )
  • 0x0402 IPv6 Internal Routes ( IP-Specific TLV Types )
  • 0x0403 IPv6 External Routes ( IP-Specific TLV Types )
  • 0x0602 Multi Protocol Internal Routes ( AFI-Specific TLV Types )
  • 0x0603 Multi Protocol External Routes ( AFI-Specific TLV Types )
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