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Link Reversal Routing

Link Reversal Routing. “ Full ” Link Reversal Algorithm. The algorithm determines routes to one specific destination When there are multiple destination, one instance of the algorithm is used for each destination separately These slides focus on one instance of the algorithm

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Link Reversal Routing

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  1. Link Reversal Routing

  2. “Full” Link Reversal Algorithm • The algorithm determines routes to one specific destination • When there are multiple destination, one instance of the algorithm is used for each destination separately • These slides focus on one instance of the algorithm • In the example that follows, D is the chosen destination

  3. Link Reversal Algorithm A B F Links are bi-directional But algorithm imposes logical directions on them C E G Maintain a directed acyclic graph (DAG) for each destination, with the destination being the onlysink This DAG is fordestination node D D

  4. Link Reversal Algorithm A B F C E G Link (G,D) broke D Any node, other than the destination, that has no outgoing links reverses all its incoming links. Node G has no outgoing links

  5. Link Reversal Algorithm A B F C E G Represents a link that was reversed recently D Now nodes E and F have no outgoing links

  6. Link Reversal Algorithm A B F C E G Represents a link that was reversed recently D Now nodes B and G have no outgoing links

  7. Link Reversal Algorithm A B F C E G Represents a link that was reversed recently D Now nodes A and F have no outgoing links

  8. Link Reversal Algorithm A B F C E G Represents a link that was reversed recently D Now all nodes (other than destination D) have an outgoing link

  9. Link Reversal Algorithm A B F C E G D DAG has been restored with only the destination as a sink

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