Alternate routing > Reduce blocking probability Primary Path If the shortest path is unavailable Origin Node the call can try other paths Destination Nor 0 · Edge-disjoint Problem Alternate 1) Alternate traffic usually use more pa resources than primary traffic 2)This inefficiency may lead to increase in blocking probability. Solution 1)Limit the number of choices of alternate paths 2) Add threshold to the alternate traffic certain capacity is exclusively reserved for primary traffic➢ Reduce blocking probability If the shortest path is unavailable, the call can try other paths. • Edge-disjoint Problem: 1) Alternate traffic usually use more resources than primary traffic. 2) This inefficiency may lead to increase in blocking probability. Solution: 1) Limit the number of choices of alternate paths. 2) Add threshold to the alternate traffic￾certain capacity is exclusively reserved for primary traffic. Alternate Routing Origin Node Destination Node Primary Path Alternate path 7