While working on a network using VTP (without pruning yet), I noticed the STP topology (for VLAN 10 let say as an example) was including all switches even the ones not having any interface in the VLAN 10.
Is this having an impact on the convergence time for VLAN 10 knowing the network is using rapid-pvst? I would say no as RSTP seems insensitive to network size while propagating TC. No risk neither to flood more unicast (due to mac address tables being flushed) as those switches are not having any interface tied to our VLAN10.
If I enable VTP pruning, will the switches not having VLAN 10 interface will still create a RSTP instance for "their" local STP topology? Asking this because they will still have VLAN10 in vlan.dat but no trunk link allowing VLAN10 traffic to exchange BPDU for that VLAN? They will thus consider themselves as Root bridge for that topology instance?
I finally ended up with more than one question but that will help me to better understand how VTP and RSTP actually interconnects.
Official doc from Cisco about VTP (https://www.cisco.com/c/en/us/support/docs/lan-switching/vtp/10558-21.html) highlights some potential risks using VTP in parallel to STP but I'm not able to figure out what are they (if using RSTP, not STP).