vtp pruning vs. switchport trunk vlan allowed
smcclenaghan
Member Posts: 139
in CCNP
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.
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.
Comments
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kohr-ah
Member Posts: 1,277
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
Member Posts: 139
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. -
koz24
Member Posts: 766 ■■■■□□□□□□
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.