Hi,

Using Role Request messages will help you:
http://ryu.readthedocs.io/en/latest/ofproto_v1_3_ref.html#role-request-message

Slave controllers do not receive OFPT_PACKET_IN, and are allowed read-only access to OpenFlow features:
https://3vf60mmveq1g8vzn48q2o71a-wpengine.netdna-ssl.com/wp-content/uploads/2014/10/openflow-switch-v1.3.5.pdf
    (See P.147)


Thanks,
Fujimoto

On 2018年03月17日 01:16, Soliman Awad Alshra´a Abdullah TU Ilmenau wrote:

Hello,

My topology has two controllers(C1, C2), and I need switches in some situations to send packet to C1 only( how !!)


Thanks

A.Soliman



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