Did you read the FAQ?
Q: How do I configure mirroring of all traffic to a GRE tunnel?
A: The following commands configure br0 with eth0 and tap0 as trunk
ports. All traffic coming in or going out on eth0 or tap0 is also
mirrored to gre0, a GRE tunnel to the remote host 192.168.1.10; any
traffic arriving on gre0 is dropped:
ovs-vsctl add-br br0
ovs-vsctl add-port br0 eth0
ovs-vsctl add-port br0 tap0
ovs-vsctl add-port br0 gre0 \
-- set interface gre0 type=gre options:remote_ip=192.168.1.10 \
-- --id=@p get port gre0 \
-- --id=@m create mirror name=m0 select-all=true output-port=@p \
-- set bridge br0 mirrors=@m
To later disable mirroring and destroy the GRE tunnel:
ovs-vsctl clear bridge br0 mirrors
ovs-vcstl del-port br0 gre0
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