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Not-via characteristics 100% coverage in all cases Intuitive repair paths Next best path Close to path used after re-convergence Requires tunnels But combining with LFAs reduces the volume of tunnelled traffic in most topologies Only required at protecting nodes, not all nodes on repair path Computational complexity about an order of magnitude worse than normal SPF Not-via typically < 100mS compute Slightly longer for complex SRLGs Requires an extra (private) address per interface Can assign a “group” to a router and allow automatic allocation. |