EIGRP Notes – Message Types
Please correct if I’m being stupid…which is a lot of the time.
Hello : Discovers and maintains neighbors
Destination: 184.108.40.206 Important fields: K values
Update : An update to the topology such as a route withdrawal or a metric change
Destination: 220.127.116.11 -or- unicast during neighbor discovery Important fields: Message sequence number Route being updated including k values to compute metric
Query : Used to ask a neighbor if it has a route to a certain network; see casino online for free stuck-in-active
Destination: 18.104.22.168 Important fields: Message sequence number Network being queried
Reply : Sent in response to a query message telling a router whether or not it has a route
Destination: Important fields: Message sequence number Sequence number of message to ack Network being queried along with k values to compute metric
Ack : Used to acknowledge updates, queries, replies
Destination: Unicast address of router Important fields: Sequence number of message to ack
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I know it’s rarely mentioned but isn’t there a goodbye message too?
There is a goodbye message, Steven, but it’s a fairly new feature introduced around 12.3(2). A long time ago, but still not testable, I guess, since it’s not mentioned in any of my reading. It looks to be only used when you shut down the EIGRP process gracefully.