While setting up a new VLAN at our main office I found that every port (in a stack of 6 switches) was set to switch port mode trunk. Trunk for computer, printers, etc. I asked the vendor why it was done this way long ago as I inherited it. See how many mistakes you can spot. Comments welcome on what they said.
That connection config indicates that VLAN 15 is the LAN network and VLAN 10 is for phones. Any place that has dual purpose ports or allows tethering uses trunking.
Because 15 is native, anything plugged in will default to that VLAN while a phone, which will get specific config instructions on boot normally, will switch over to VLAN 10 to segregate the traffic. You have to do that config unless you specifically want to dedicate LAN port and Phone ports.
Spanning tree isn’t an issue unless you introduce loops and don’t have it configured well.
If there’s no loop I have a hard time understanding how spanning-tree would come into play period. If spanning-tree did come into play, we would still have the same issue in general mode as ports would be have untagged VLANs.
The general recommended/best-practice in the industry for both Cisco and Dell has always been to utilize Trunk mode when 2 different networks come into play like, otherwise Access mode is normally recommended.
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