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According to OpenFlow Spec 1.3.5, OFPT_PORT_STATUS messages with the reason value OFPPR_MODIFY should be sent the BOTH port state and config have changed. On the other hand, OVS does not send OFPT_PORT_STATUS messages when the port config has changed and only sends when the port state has changed. But, other switch implementation, e.g. Lagopus, sends messages when the both port state and config have changed. Therefore, simple_switch_stp_13.py will overproduce the topology recalculation events and will fail to recalculate the topology. This patch checks the port state in OFPT_PORT_STATUS messages and ignores the message if the port state is not changed. Reported-by: Hong Panha <c011361065@edu.teu.ac.jp> Signed-off-by: IWASE Yusuke <iwase.yusuke0@gmail.com> Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>