Opendaylight: Getting notification on flow miss event

Question

I want to build an Opendaylight Boron application which needs to field notifications from MDSAL when a flow miss event is encountered and the packet is sent up to the controller for processing. How can I solicit such events?

If it were possible to register for ALL openflow notifications, that would suffice.

Any pointers or code snippets to do this?

Thank you,

Ranga

Answer 1

Packets that are sent from the switch to the controller are called PacketIn packets.

You need to create a Java class that listens for PacketIn by implementing the OpenDaylight PacketProcessingListener interface.

Here's an example tutorial.

And here is an example of a class I wrote in the SFC project that handles PacketIn packets sent to the controller from OVS:

Answer 2

Add a flow such that the default action is punt to controller and all the other flsow with higher priority, such that missed matches will be forwarded to controller.

cookie=0x3900000, duration=1s, table=0, n_packets=0, n_bytes=0, priority=10 in_port=1 actions=output:2
cookie=0x2900000, duration=1s, table=0, n_packets=0, n_bytes=0, priority=0 actions=CONTROLLER:65535