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Ashwini,

I'm not sure what method ovs uses to pick it's mac address when you create the bridge, but I know it's not using the same one each time. The switch mac address that it connects to the controller with is converted to decimal and used as the id number. You can specify the mac address to use, with a command like this:

sudo ovs-vsctl set bridge s1 other-config:hwaddr=\"00:00:00:00:00:01\"

However, if you are seeing two switches connected to your controller with different IDs with only a single ovs instance, then you are hitting some kind of bug or environment issue. If this is the case, can you provide more details (e.g. ifconfig -a, on your ovs system, output of a rest call to controller @ /restconf/operational/opendaylight-inventory:nodes

JamO