3. Remote Loop Free Alternate (RLFA)
3.1 Solution
The Fast ReRoute "Remote Loop Free Alternate" (Remote LFA) solution is an extension of LFA. RLFA is specified in RFC 7490 [ IETF 7490 ]. RLFA is similar to LFA, except that the backup next-hop is not necessarily directly connected to the PLR by a physical link, but can be remote and joined by a virtual, tunnel-type link. In this case, RLFA uses an IP or MPLS tunnel to send its packets directly to this RLFA node.
Figure 8 illustrates a ring topology for which LFA cannot find a solution. RLFA finds a solution when the metrics of the links in the ring are close enough. Router "S" uses a tunnel (in blue)...
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Remote Loop Free Alternate (RLFA)
Preferences between several backup next-hops
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