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Next: MultiPath Routing Up: 23.2 Other Configuration Mechanisms Previous: 23.2 Other Configuration Mechanisms Asymmetric Routing

Asymmetric routing occurs when the path from node n1 to node n2 is different from the path from n2 to n1. The following shows a simple topology, and cost configuration that can achieve such a result:

Nodes n1 and n2 use different paths to reach each other. All other pairs of nodes use symmetric paths to reach each other.


    \$ns cost \$n1 \$r1 2
    \$ns cost \$n2 \$r2 2
    \$ns cost \$r1 \$n2 3

Any routing protocol that uses link costs as the metric can observe such asymmetric routing if the link costs are appropriately configured 23.3.