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What are two causes of EIGRP neighbor instability? (Choose two)
Holding time expired.
Stuck-in active routes.
Uptime is expired.
A destination route in passive state.
Holding time expires when an EIGRP packet is not seen for the duration of the hold time and it is typically casued by congestion or physical errors. A stuck-in active route is when a router goes into active state. The normal state of an EIGRP route is passive. When there is a route in active state, it means that the route is lost or stuck and there are no feasible successors. The router is actively looking for an alternative path. If k-values mismatch, the EIGRP router would simply not form an adjacency. For more information refer to: http://www.cisco.com/c/en/us/td/docs/ios/122/iproute/command/reference/fiprrpr/1rfeigrp.html
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