vtp pruning vs. switchport trunk vlan allowed

Does Cisco publish any clear criteria explaining when vtp pruning should be favored over 'switchport trunk vlan allowed' or vice versa?

My best attempts at criteria after a lot of net scouring seem to be:
1) If you have to apply the pruning to specific vlans or specific trunks, choose the 'switchport trunk vlan allowed' method.
2) vtp pruning is an enhancement to a spanning-tree design. So if you're modifying a spanning-tree design, choose vtp pruning.

Without violating NDA from exams, I'd love to hear some of your thoughts on this.

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Comments

kohr-ah

VTP Pruning = I dont want to tell others about my VLANs
Switchport trunk vlan allowed = I want this specific device to use these VLANs only

Perfect Example I have 15 Vlans and I have a wireless controller. The wireless controller utilizes 4 of them. I trunk the wireless controller to my switch and dont want the other 11 vlans to have their information sent over that trunk. I would do switchport trunk vlan allowed and do the 4 vlans the controller needs.

smcclenaghan

I appreciate the insight.

It's a fine line and we're often asked to choose between these two options. I just don't want to screw it up on the exam. Thanks again.

linuxabuser

It also matters when you don't run VTP!

koz24

When in doubt, switchport trunk allowed vlan is probably the more correct answer. The "Cisco" answer. I had a lot of these types of questions on my exam. Not necessarily vtp pruning vs allowed, but questions where it seemed like there was more than 1 correct answer.