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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