Link State Route Calculations

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Presentation transcript:

Link State Route Calculations Calculate shortest path for node s Dijkstra’s Algorithm: s source node. Dn cost of the least-cost path from node s to node n M = {s}; for each n  M Dn = dsn; while (M  all nodes) do Find w  M for which Dw = min{Dj ; j  M}; Add w to M; Dn = minw [ Dn, Dw + dwn ]; Update route; enddo Malathi Veeraraghavan (originals by Jörg Liebeherr)

Example Malathi Veeraraghavan (originals by Jörg Liebeherr)

Example (at node 1) Iteration M D1 D2 D3 D4 D5 D6 Init Malathi Veeraraghavan (originals by Jörg Liebeherr)

Answer Dijkstra’s algorithm – add in routes at each step Malathi Veeraraghavan (originals by Jörg Liebeherr)

Resulting Routing Tree The tree is translated into a routing table at node 1: Destination Next Hop 2 2 3 4 4 4 5 4 6 4 Malathi Veeraraghavan (originals by Jörg Liebeherr)