EIGRP Packet Types

Understand the five types of EIGRP packets and their roles in routing protocol operation.

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EIGRP uses five packet types:

Hello

Discovers neighbors, sent every 5 seconds on LANs.

Update

Shares routing info on topology changes.

Query

Seeks alternate paths when a route fails.

Reply

Responds to Queries with route details.

ACK

Confirms receipt of Updates, Queries, or Replies.

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