Refer to the exhibit. Which purpose does the highlighted flow entry fulfil?

Question

Exhibit

Options

• AIt helps the HP VAN SDN Controller discover links between OpenFlow switches.
• BIt helps the HP VAN SDN Controller discover interfaces that are creating a loop.
• CIt help the HP VAN SDN Controller discover system information about OpenFlow switches.
• DIt helps the HP VAN SDN Controller discover end nodes connected to the network.

• A
  84% (21)
• B
  4% (1)
• C
  4% (1)
• D
  8% (2)

Explanation

From the exhibit we see that the flow entry matches on the bddp protocol. 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 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.

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