To illustrate the discussion in rtgarea about the importance of
using the configured link metrics vs using hop count when looking at LFA
here's a comparison of LFA's coverage, considering the percentage of
links that are fully covered by LFAs in various topologies.
It shows the coverage with configured metrics vs. coverage with hop count.
ISPs A, D, and E are national ISPs. ISPs B and C are Tier-1 ISPs
Note that the results for ISPE have *not* been swapped.
ISPA : 46% vs 12%
ISPB : 50% vs 40%
ISPC : 66% vs 46%
ISPD : 31% vs 21%
ISPE : 7% vs 46%
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