Hellos – Identifies neighbors Used by the neighbor discovery and recovery process. Multicast Unreliable delivery Acknowledgements (ACK) – Acknowledges receipt Hello packets with no data Unicast Unreliable delivery Updates – Advertises routes Transmitted only when necessary Unicast when sent to a specific router Multicast when sent to multiple routers Reliable delivery Queries – Ask about a route (DUAL) Reliable delivery Multicast or Unicast Queries and Replies – Ask about a route and answer a query (DUAL) Reliable delivery Replies: Unicast.
