I have an Ubuntu host. I have installed openvswitch on that. I have created bridges like br-int, br-tun on that. What I observed is that after some time/duration, these bridges does down and I have to manually bring them up using "ifconfig br-int up". I want to automate the procedure that whenever the link/bridge goes down, system internally fires this command to bring the interfaces up. How can I achieve that? I don't want to run cronjob after specific duration of time to keep on bringing the interfaces/bridges up. Is there any other alternative possible?