[Ns-bugs] [Bug 114] global routing doesn't handle multi-hop layer-2 subnets

[bugzilla-daemon@nsnam-www.ece.gatech.edu]

http://www.nsnam.org/bugzilla/show_bug.cgi?id=114


tomh at tomh.org changed:

           What    |Removed                     |Added
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                 CC|                            |ns-bugs at isi.edu
         AssignedTo|ns-bugs at isi.edu             |craigdo at ee.washington.edu




------- Comment #3 from tomh at tomh.org  2008-09-11 17:05 -------
we discussed this last Friday.  There likely is new API necessary for a
NetDevice to make this work:  NetDevice::IsBridge().

Basically, the global routing code crawls the network, link-by-link.  If it
encounters a bridge node, it will first encounter a NetDevice type that is a
real interface (such as CSMA).  It needs to determine whether the CSMA
interface is part of a bridge group and, if so, find all of the
bridged-together NetDevices and recursively crawl each of those channels
looking for more NetDevices in the same broadcast domain.

If there is a NetDevice::IsBridge() method, the code can iterate the devices on
a target node and look for bridge devices.  For each bridge device found, it
can iterate and look whether the device in question is part of that bridge
group.  

A more direct way would be to ask the target device (i.e., the CSMA interface)
whether it is itself part of a bridge group (e.g., NetDevice::IsBridged() 
-note the trailing "d") but that would require devices to know whether they are
in a bridge or not and is not strictly required to make this global routing
work.  So, we agreed to try for a solution that would add NetDevice::IsBridge()
and set it to true for any device that considers itself a bridge.


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