CCIE Routing and Switching (legacy) — Question 32

After implementing VTP, the extended VLANs are not being propagated to other VTP switches.
What should be configured for extended VLANs?

Answer options

• A. VTP does not support extended VLANs and should be manually added to all switches.
• B. Enable VTP version 3, which supports extended VLAN propagation.
• C. VTP authentication is required when using extended VLANs because of their ability to cause network instability.
• D. Ensure that all switches run the same Cisco IOS version. Extended VLANs will not propagate to different IOS versions when extended VLANs are in use.

Correct answer:

Explanation

The correct answer is B because VTP version 3 is specifically designed to support extended VLAN propagation, unlike earlier versions. Option A is incorrect as extended VLANs can be propagated with the right VTP version. Option C is misleading; while authentication adds security, it is not specifically required for extended VLANs. Option D is also incorrect since VTP version 3 allows for interoperability across different IOS versions regarding extended VLANs.