You can enable path optimization for fast reroute by configuring the fast reroute optimize timer. The optimize timer triggers a periodic optimization process that recomputes the fast reroute detour LSPs to use network resources more efficiently.
To enable fast reroute path optimization, specify the number of seconds including the fast-reroute optimize-timer statement:
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fast-reroute optimize-timer seconds;
You can include this statement at the following hierarchy levels: