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Exam 300-620 topic 1 question 207 discussion

Actual exam question from Cisco's 300-620
Question #: 207
Topic #: 1
[All 300-620 Questions]



Refer to the exhibit. A client is configuring a new Cisco ACI fabric. All VLANs will be extended during the migration phase using the VPC connections on leaf switches 3, 4 and leaf switches 5, 6 toward the legacy network. The migration phase has these requirements:

• The legacy switches must be able to transfer BPDUs through the ACI fabric.
• If the legacy switches fail to break a loop, Cisco ACI must break the loop.

Which group settings must be configured on VPC interface policy groups ipg_vpc-legacy_1 and ipg_vpc-legacy_2 to meet these requirements?

  • A. MCP: enabled -

    BPDU Guard: disabled -

    BPDU Filter: disabled -
  • B. MCP: disabled -

    BPDU Guard: enabled -

    BPDU Filter: enabled -
  • C. MCP: enabled -

    BPDU Guard: enabled -

    BPDU Filter: disabled -
  • D. MCP: disabled -

    BPDU Guard: disabled -
    BPDU Filter: enabled
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
by Rododendron2 at May 11, 2023, 8:20 p.m.

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msalamehi
8 months, 1 week ago
Selected Answer: A
voting A
upvoted 1 times
...
Dash
1 year, 4 months ago
Selected Answer: A
definitely A
upvoted 1 times
...
thinqtanklearningDOTcom
1 year, 5 months ago
Selected Answer: A
MCP detects loops from external sources and will err-disable the interface on which ACI receives its own packet. Enabling this feature is a best practice and it should be enabled globally and on all interfaces, regardless of the end device. MCP works to stop Layer-2 loops, it should be enabled right away on an ACI Fabric prior to connecting Layer-2 devices for migration purposes. As explained in this article, ACI Operation with L2 Switches and Spanning-tree Link Types, by default, the STP link type on Legacy switches is P2P. ACI acts as a hub for BPDUs. By configuring the STP link type as Shared for your external switch interfaces which connect to ACI, you ensure that you allow the switches to take their time with the STP transition process, thereby protecting your environment from potential STP loop formation. Even though ACI does not generate STP BPDUs, ACI switches will forward STP BPDUs across EPGs on which they are received. This allows the externally connected switches to maintain a loop-free topology and avoid broadcast storms and other nastiness that goes hand-in-hand when layer-2 loops form!
upvoted 1 times
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Rododendron2
1 year, 5 months ago
Selected Answer: A
voting A
upvoted 2 times
...
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