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Hierarchical routing may be used in conjunction with Session simulations
(see Chapter ![[*]](crossref.png)
). Session-level simulations which are used
for running multicast simulations over very large topologies, gains
additionally in terms of memory savings if used with hierarchical
routing. See simulation script ~ns/tcl/ex/newmcast/session-hier.tcl
for an example of sessionsim over hier rtg.