CCIE Data Center (legacy) — Question 111

Consistency checks and compatibility checks are performed before a Virtual PortChannel (vPC) is created. During a compatibility check, one vPC peer conveys configuration information to the other vPC peer in order to verify that vPC member ports can actually form a PortChannel.
Which statements about a "Virtual PortChannel graceful consistent check" are true? (Choose two.)

Answer options

• A. Graceful consistency check is enabled by default.
• B. When graceful consistency check is enabled, only the links on the secondary peer device are suspended.
• C. Graceful consistency check is disabled by default, so to enable this feature, use graceful consistency-check command under VPC domain configuration mode.
• D. When graceful consistency check is enabled, only the inconsistent VLANs on the secondary peer device are suspended.

Correct answer: A, B

Explanation

The correct answers are A and B. A is right because the graceful consistency check feature is indeed enabled by default, which helps ensure seamless operations. B is also correct as it specifies that only the links on the secondary peer are suspended when this check is active. Options C and D are incorrect because they misstate the default setting and the behavior of the feature, respectively.