EIGRP Packet Sorts: The Full Information in 2022

August 10, 2022

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As we all know, EIGRP i.e. Enhanced Inside Gateway Routing Protocol is a routing protocol that specify how routers or information switches talk with one another. It’s known as a Transport Layer Protocol because it runs on high of the IP. Not like software layer protocols (Telnet, BGP and so on.), EIGRP has its personal reliability mechanism.

EIGRP makes use of 5 packet varieties in communication with its neighbours. The routing data carried by the packets is shipped reliably via a sequence quantity. The sequence quantity is assigned to every dependable packet (i.e. Replace, Question, and Reply) and a clear-cut acknowledgment is required for that sequence quantity.

EIGRP makes use of Dependable Transport Protocol (RTP) to alternate packets between the neighbors in a dependable and ordered method.

On this article, we’ll talk about the packet kinds of EIGRP.

EIGRP Packet Sorts

The EIGRP packet varieties are mentioned intimately under –

Hello Packet

EIGRP makes use of good day packets within the discovery of neighbors. They’re multicast to 224.0.0.10. By default, EIGRP sends good day packets each 5 seconds (60 seconds on WAN hyperlinks with 1.544 Mbps speeds or much less). Vital options of Whats up Packet are:

Opcode 5
Neighbor discovery
It’s at all times multicast.
The periodical timer is 5 seconds. Maintain down timer is 15 seconds.

Acknowledgment (ACK) Packet

An acknowledgment packet acknowledges the reception of an replace packet. It’s a good day packet with no information. EIGRP sends acknowledgment packets to the unicast deal with of the sender of the replace packet. Vital options of ACK Packet are:

Opcode 5
Used to acknowledge the receipt of EIGRP packets (Replace, Question and Reply)
It’s at all times a Unicast

Replace Packet

Replace packets comprise routing data for locations. EIGRP unicasts replace packets to newly found neighbors; in any other case, it multicasts replace packets to 224.0.0.10 when a hyperlink or metric adjustments. Replace packets are acknowledged to make sure dependable transmission. Vital options of Replace Packet are:

Opcode 1
Used to convey/propagate EIGRP routing updates
May be Unicast or Multicast
Sequence Quantity & Acknowledgement Quantity
Makes use of RTP

Question Packet

EIGRP sends question packets to seek out possible successors to a vacation spot. Question packets are at all times multicast. Vital options of Question Packet are:

Opcode 3
Used to get particular data from neighbour router
May be Unicast or Multicast
Makes use of RTP
Sequence & Acknowledge numbers

Reply Packet

EIGRP sends reply packets to answer question packets. Reply packets present a possible successor to the sender of the question. Reply packets are unicast to the sender of the question packet. Vital options of Reply Packet are: