EIGRP Packet Types

In this article we will discuss EIGRP Packet Types, will make brief discussion on EIGRP Packet Types, In last article we discuss about Authentication in EIGRP.

EIGRP uses five different packet types, some in pairs. EIGRP packets are sent using either RTP reliable or unreliable delivery and can be sent as a unicast, multicast, or sometimes both.

EIGRP packet types are also called EIGRP packet formats or EIGRP messages.

Hello packets – Used for neighbor discovery and to maintain neighbor adjacencies.

  • Sent with unreliable delivery
  • Multicast (on most network types)

Update packets – Propagates routing information to EIGRP neighbors.

  • Sent with reliable delivery
  • Unicast or multicast

Acknowledgment packets – Used to acknowledge the receipt of an EIGRP message that was sent using reliable delivery.

  • Sent with unreliable delivery
  • Unicast

Query packets – Used to query routes from neighbors.

  • Sent with reliable delivery
  • Unicast or multicast

Reply packets – Sent in response to an EIGRP query.

  • Sent with reliable delivery
  • Unicast

EIGRP for IPv4 messages use IPv4 as the network layer protocol. The IPv4 protocol field uses 88 to indicate the data portion of the packet is an EIGRP for IPv4 message. EIGRP for IPv6 messages are encapsulated in IPv6 packets using the next header field of 88. Similar to the protocol field for IPv4, the IPv6 next header field indicates the type of data carried in the IPv6 packet.

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