EIGRP: SIA-Query and SIA-Reply Packets

SIA-Query and SIA-Reply are used when the diffusing computation takes a long amount of time to verify if a neighbor that has not yet sent a Reply to a Query is truly reachable and still participating in the diffusing computation.

The SIA-Query packet is used to ask a neighbor to confirm if they are still working on the original Query.

If the neighbor is still engaged in the diffusing computation and awaiting the original Reply, it sends a SIA-Reply to the originator of the SIA-Query.

This resets the timer that governs the max time alloted for the diffusing computation to complete.

SIA-Query is assigned Opcode of 10

SIA-Reply is assigned Opcode of 11


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