Excellent!.
1) If I were to attempt to build a database backed controller where the
database stores
1) topology information
2) flow table information
I could use the cached information to store the topology? Is my
understanding correct?
2) Can you point me to the datastructure where it caches the information
Thanks & Regards,
Karthik.
On 16 April 2014 09:45, FUJITA Tomonori <[email protected]>wrote:
> 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.
>
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