Enhanced procedure to compute LFAs with IGP max metric
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United States of America Patent
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Aug 2, 2016
Grant Date -
Dec 3, 2015
app pub date -
May 27, 2014
filing date -
May 27, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A method and implementing system calculates a loop free alternative (LFA) next hop as a backup for a primary path next hop for an interior gateway protocol (IGP). The method enables consideration of the LFA next hop where a link to the next hop has a reverse cost that has a maximum value. The method includes selecting a next candidate next hop from a set of candidate next hops in the network, checking whether a link to the next candidate next hop is an administratively allowable link, and checking whether the link has a maximum forward cost. The method further checks whether the link is bi-directional and computes the LFA using the next candidate next hop where the link is administratively allowable link, where the link does not have a maximum forward cost and where the link is bi-directional without consideration of reverse cost of the link.
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