[pox-dev] Install actions to indirectly connected switches

[Ayush Dusia]

Hi Lucas,

Thanks for your reply!

I have installed a permanent rule in S1 to forward the packets to S2 that
have destination address of S2.

Topology: C0 - S1 - S2

Now, when I want to install rules in S2, how should I go about it?

1) Should I create a ofp_packet_out with destination of S2, attached
ofp_flow_mod packet (rules for S2) as data to it and send it to S1?

2) Should I create a ofp_flow_mod packet which has destination address of
S2 and send it to S1?

I would really appreciate your help!

Thanks,
Ayush


On Wed, Apr 22, 2015 at 8:19 AM, Lucas Brasilino <lrbbs at cin.ufpe.br> wrote:

> Hi Ayush,
>
> Since controller connects to switch using a TCP session, if S1 acts like a
> learning switch or already has rules on its flow table
> allowing TCP connections from C0 to S2, C0 will control S2.
>
> Just be aware that if S1 is an OF switch and those rules mentioned above
> expires, you will lost control over S2, even for a while.
> What I mean is that until you restore S1 rules, some switch-to-controller
> messages like 'Packet In', 'Port Status', 'FlowRemoved' and
> so forth can be lost, leading for a network's state mismatch.
>
> --
> Att
> Lucas Brasilino
> MSc Student @ Federal University of Pernambuco (UFPE) / Brazil
> twitter: @lucas_brasilino
>
>
>
> 2015-04-22 0:10 GMT-03:00 Ayush Dusia <adusia at udel.edu>:
>
> Hello Everyone,
>>
>> I have a question regarding installation of actions in switches.
>>
>> If I assume that a controller does not have direct connections to all the
>> switches in a network. In that case how can a controller install actions in
>> a switch to which it is not directly connected?
>>
>> e.g. for a topology like: C0 - S1 - S2
>>
>> How can C0 install actions in S2 through S1?
>>
>> Thanks,
>> Ayush
>>
>
>
>
>
>
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