What would the impact be to servers that have a trunk running to them when/if I enable VTP Pruning?
I have a number of ESX Boxes with VMs on various VLANs... what would happen? Thanks.
If you enable VTP Pruning while having trunk lines to end hosts, the VLANs will be pruned from these trunks. The VTP Pruning feature requires the VTP Join messages to be received on a trunk port to decide whether a VLAN should be pruned or not. As the end hosts do not generate VTP Join messages, all VLANs will appear as unused to a switch so it will prune them off the trunk.
You can, however, configure a list of pruning-ineligible VLANs on a trunk, i.e., VLANs that should never be pruned. This is done using the command
switchport trunk pruning vlan none
This way, you can have the VTP Pruning turned on and at the same time prevent the VLANs from being pruned on a selected trunk interface.
Not sure because the servers don't participate in VTP.
However rather than use VTP pruning you should actually just be specific on the trunk link with the "switchport trunk vlan allowed.." command and only allow the vlans that the servers need access to.