Restrictions for EIGRP Loop-Free Alternate IP Fast Reroute
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IPv6 LFA IP FRR is not supported.
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LFA IP FRR is not supported with primary path or backup path as Multiprotocol Label Switching (MPLS).
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LFA IP FRR is not supported with primary path or backup path as Equal-Cost Multipath (ECMP).
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LFA IP FRR is only available in network-advantage license level.
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Generic Routing Encapsulation (GRE) tunnel as primary path is not supported.
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The convergence time may be higher in cases of high CPU utilisation.
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The convergence time is dependent on the primary link status detection, and so if the physical link goes down in cases of logical interfaces like Switched Virtual interface (SVI) and port channels, the convergence time is expected to be higher.