Explanation/Reference:
From the exhibit we see that the flow entry matches on the bddp protocol.
OpenFlow BDDP
LLDP is used to discover other OpenFlow enabled switches that are directly connected. However, if two OpenFlow switches are separated by a non-OpenFlow switch, this process may fail. The intermediate switch may also be running LLDP and is thus subscribed to the LLDP multicast. In that case, the LLDP message from one OpenFlow switch is not seen by the other OpenFlow switch.
However, a broadcast frame (BDDP) will typically be forwarded by the intermediate switch within the same broadcast domain. BDDP has the same TLV information as LLDP.
Illustration OpenFlow BDDP.

References: HP Switch Software OpenFlow Administrator's Guide K/KA/WB 15.14
http://h20628.www2.hp.com/km-ext/kmcsdirect/emr_na-c03991489-1.pdf