Hi All,
I was wondering what would be the behavior of the NOX controller(using
routing app package) and of an Openflow switch upon link failures.
To be more specific, assume that there are already some flow
entries(FEs) in switch A which will output packets to port X (X is
connected to port Y on switch B). When this link fails, I guess that
both A and B will send ofp_port_status messages to the controller. My
question then is, what will happen to these flow entries(FEs)? Will they
be removed by the switch itself immediately, or they have to wait for
the hard timeout? During that period, will all the packets matched by
those entries be going to the dead link?
To my knowledge, the NOX routing app package does not remember the flow
entries it create(correct me if I am wrong). Then if it is the hard
timeout case, it seems that it will take some time for those entries to
get corrected by the controller. I really appreciate it if someone can
point me to a place where I can figure out this whole process.
Thank you so much in advance!
-Zheng Cai
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