Abstract
This paper studies how to employ the incremental shortest path first algorithm to reduce the computational overhead of the DC (Downstream Criterion) implementation, and proposes an efficient Intra-domain routing protection algorithm based on i-SPF (ERPISPF). Theoretical analysis indicates that the time complexity of ERPISPF is less than that of constructing a shortest path tree. The experiment results show that ERPISPF reduce more than 93% computation overhead compared to the DC, and can provide the same protection ratio with DC.
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