On Wed, 16 Apr 2014 09:45:48 +1200 Karthik Sharma <[email protected]> wrote:
> O.K.From where does topology application get the switch and link > information? > Does topology application inturn poll the switches via OpenFlow control > channel to get that information? > > Or does it pre-compute and store it (somewhere) if I run the application > with > > $ sudo ryu-manager --observe-links ryu/app/simple_switch.py > > What I am trying to understand are the following. > > 1) Is the topology information stored in some data structure in the > controller ? Yes. The topology application uses LLDP to find links and caches the information: http://en.wikipedia.org/wiki/Link_Layer_Discovery_Protocol > 2) When I query the topology via (get_switch() and get_links() ) does it > impose any channel overhead on the control channle? No. ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech _______________________________________________ Ryu-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/ryu-devel
