Examples

The four examples use the bundled L2 P4 program and Go 1.26 or newer. Run their commands from a repository checkout at v2.0.1. Start BMv2 before running them.

Example	Behavior
Connect	Becomes primary, prints pipeline information when present and waits for Ctrl+C.
L2 forwarding	Installs the pipeline and writes one fixed destination MAC entry forwarding to port 1.
Packet I/O	Receives PacketIn and can send a frame through PacketOut at startup.
Counters	Reads the indirect counter indexed by egress port.

Run the L2 example before the Packet I/O and counter examples. It supplies a fixed entry rather than learning MAC addresses automatically.

CPU Packet I/O loopback uses port 255 and works through gRPC. Ethernet forwarding to data ports needs bound host interfaces. To obtain nonzero counter values, send traffic matching the L2 entry. The L2 fixture guide explains the P4 program, interfaces and packet headers.

For a complete controller that stays connected and receives packets, use the quickstart.