[ns] Hierarchical Routing Implementation question

[Gaurav Navlakha <navlakha@students.uiuc.edu>]

Hi,

I'm currently looking at ns version 2.1b7a.

I have a question on hierarchical routing in particular, and the routing
implementation in general, in NS.

The functions for calculating the hierarchical routing routes all seem to
be 'centralized' in the file route.cc and route.h

My question is:

Does NS calculate all the routes (according to the specified hierarchy of
nodes) centrally, and do each of the 'node's just look up the route in
this central location in order to route packets? (As opposed to each node
implementing the routing protocol by sending routing updates to each of
the neighboring nodes, and using these updates to calculate the routes)

If yes, then does NS not simulate the actual sending of routing update
messages between routers at all (in both normal, and hierarchical routing)

I wish to implement a "different" Hierarchical Routing Protocol in NS
in order to compare it with the existing one (perhaps). But I'm not sure
if NS was also built with spec-conforming implementations of Routing
Protocols such as OSPF, BGP, etc.. that could be tweaked/replaced by other
routing protocols to study comparative performance.

Any help will be greatly appreciated.

Thank you,
Gaurav.

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 Gaurav Navlakha
 Graduate Student
 Computer Science
 University of Illinois, Urbana Champaign.

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