On 7/30/12 4:41 PM, kashyap TA wrote:
Hi All,
I am looking for a use case in the real worl where we will be
putting the Multiple Flow Table concept in Openflow into action. Can
somebody let me know if there are any sample use cases? Please do let me
know.
If you have multiple orthogonal sets of things that you want to do to
packets (e.g. forwarding rules and QoS rules), using a single table may
create a cartesian product explosion of rules, which breaks your network
by immediately exhausting the table if you're using hardware switches.
This was discussed back in the beginning of OpenFlow time:
http://www.openflow.org/documents/OpenFlow_1_1_Multiple_Tables_06_22_2010.pdf
Also, switch chips have multiple tables, so it seems simpler to expose
them as multiple tables. Since no one has bothered to implement this we
haven't yet discovered how painful it will be.
--
Wes Felter
IBM Research - Austin
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