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Exam HP2-Z31 topic 1 question 77 discussion

Actual exam question from HP's HP2-Z31
Question #: 77
Topic #: 1
[All HP2-Z31 Questions]

Refer to the exhibit.

A network engineer wants to use dpctl to make flow modifications directly on an HP 3800 switch flow table. Can the engineer make the changes using dpctl on the switch in the exhibit?

  • A. The engineer is unable to connect to the switch directly. Dpctl requires OpenFlow 1.0, and (he switch is currently configured to use OpenFlow 1.3.
  • B. The engineer is able to connect to the switch directly using dpctl, but is unable to use dpctl to update the flow entries on the switch. Ovs-ofctl is required to make flow modifications when using OpenFlow 1.3.
  • C. The engineer is able to connect to the switch directly using dpctl. The engineer will then need to use the correct OpenFlow 1 3 syntax to make flow modifications using dpctl.
  • D. The engineer is unable to connect to the switch directly. Once the correct configuration is completed on the switch, the engineer will be able to connect directly and then use the correct OpenFlow 1.3 syntax to make flow modifications using dpctl
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Suggested Answer: C 🗳️
dpctl
The HP supports a passive listening port per OpenFlow instance. This is super-useful when you want to debug an individual switch without going through the controller.
Add a listener port:
openflow listener ptcp:6633
Then use dpctl. Examples:
dpctl dump-tables tcp:<switch>:<port>
dpctl dump-flows tcp:<switch>:<port>
dpctl add-flow tcp:<switch>:<port> 'in_port=104 actions=output:98'

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