EIGRP: Hello Packets

EIGRP begins sending Hello packets once it has been enabled on a router interface.  These messages are used to identify neighbors, verify if these neighbors are compatible, and serve as a keepalive mechanism between neighbors.

Hello Packets are sent to multicast address 224.0.0.10 in IPv4 and FF02::A in IPv6.

If static neighbors are configured, messages are sent unicast and not multicast.

the default hello interval is 5 seconds on broadcast interfaces and 60 seconds on NBMA interfaces with bandwidth less than 1544kbps.

Hello packets have an Opcode of 5 and are not acknowledged.

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