How to Master CCNP ROUTE
GNS3Vault.com – René Molenaar Page 16 of 357
Hello packets don’t have to be acknowledged since EIGRP uses a holddown time. If a
router doesn’t receive hello packets in an X amount of time it will drop the neighbor
adjacency.
So which packets should be acknowledged? Think about routing information, if there’s a
change in the network you want to make sure all routers receive this routing update.
Let me show you all the different EIGRP packets:
Hello
Update
Query
Reply
ACK (Acknowledgement)
Hello packets are used for neighbor discovery. As soon as you send hello packets and
receive them your EIGRP routers will try to form the neighbor adjacency.
Update packets have routing information and are sent reliable to whatever router that
requires this information. Update packets can be sent to a single neighbor using unicast or
to a group of neighbors using multicast.
Query packets are used when your EIGRP router has lost information about a certain
network and doesn’t have any backup paths. What happens is that your router will send
query packets to its neighbors asking them if they have information about this particular
network.
Reply packets are used in response to the query packets and are reliable.
ACK packets are used to acknowledge the receipt of update, query and replay packets. ACK
packets are sent by using unicast.
EIGRP Neighbor Table
EIGRP Topology Table
Global Routing Table
Lists all directly connected neighbors:
Next Hop Router
Interface
Lists all learned routes from all EIGRP neighbors:
Destination
Metric
Best routes from EIGRP topology table will be
copied to the routing table.
Instead of using just a single routing table EIGRP will use multiple tables. The first one is
the neighbor table and this is where EIGRP stores all information of directly connected
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