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Date: Sat, 29 Sep 2018 11:46:45 -0700 (PDT) From: David Miller <davem@...emloft.net> To: jon.maloy@...csson.com Cc: netdev@...r.kernel.org, gordan.mihaljevic@...tech.com.au, tung.q.nguyen@...tech.com.au, hoang.h.le@...tech.com.au, canh.d.luu@...tech.com.au, ying.xue@...driver.com, tipc-discussion@...ts.sourceforge.net Subject: Re: [net 1/1] tipc: fix failover problem From: Jon Maloy <jon.maloy@...csson.com> Date: Wed, 26 Sep 2018 21:00:54 +0200 > From: LUU Duc Canh <canh.d.luu@...tech.com.au> > > We see the following scenario: > 1) Link endpoint B on node 1 discovers that its peer endpoint is gone. > Since there is a second working link, failover procedure is started. > 2) Link endpoint A on node 1 sends a FAILOVER message to peer endpoint > A on node 2. The node item 1->2 goes to state FAILINGOVER. > 3) Linke endpoint A/2 receives the failover, and is supposed to take > down its parallell link endpoint B/2, while producing a FAILOVER > message to send back to A/1. > 4) However, B/2 has already been deleted, so no FAILOVER message can > created. > 5) Node 1->2 remains in state FAILINGOVER forever, refusing to receive > any messages that can bring B/1 up again. We are left with a non- > redundant link between node 1 and 2. > > We fix this with letting endpoint A/2 build a dummy FAILOVER message > to send to back to A/1, so that the situation can be resolved. > > Signed-off-by: LUU Duc Canh <canh.d.luu@...tech.com.au> > Signed-off-by: Jon Maloy <jon.maloy@...csson.com> Applied.
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