eigrp hello packet
CCNA
EIGRP Hello Protocol: Timers, Configuration, and Troubleshooting
EIGRP neighbors don’t just form a relationship once and assume it stays healthy forever — they actively check in with each other on a regular schedule, using small Hello packets sent at a configurable interval. If those check-ins stop arriving, the neighbor relationship gets torn down, and every route learned through it disappears from the...
CCNA
EIGRP Packet Types: Hello, Update, Acknowledgment, Query, and Reply Explained
EIGRP uses five different types of packets to communicate with its neighbors: Hello, Update, Acknowledgment, Query, and Reply. Depending on the packet type, EIGRP sends them with reliable or unreliable delivery, and as unicast, multicast, or sometimes both. These packet types are sometimes also referred to as EIGRP packet formats or EIGRP messages. Here’s a...