I am experiencing an issue I can't seem to get a grasp on. I have VLANS being automatically configured on my switches and can't determine why this is happening. I hope I provide enough information below, any suggestions on what could be happening here?
FE/4 = 3000UP, 901T (Connected to 3745) - changes to: FE/4 = 1UP, 13T, 901T, 3000T
FE/5 = 3000UP, 901T (Connected to SF300 #2) - changes to: FE/5 = 1UP, 13T, 901T, 3000T
FE/8 = 901UP (10.205.240.2, Connected to SF300 #1)
VLAN 1UP on all other ports with x.x.x.x as public IP
Route set for all traffic to go out 10.205.240.2
**** I am not having problems with data or traffic going through, I am however having an issue with the switches reconfiguring the VLANS. When I plug something else into SF300 #1, the particular port I plug into changes from 3000U to 1UP, 13T, 901T, 3000T. If I plug another SF300 #3 switch into SF300 #1 it switches the interface the same and when I plug anything into #3 that particular interface changes the same.
I believe what is happening here has to do with Smartports. When you plug in another switch, the 300 detects that and switches to the SmartPort profile for a switch, which is to set it as a trunk with all VLANs allowed. When you unplug the other switch from the SG300 do the settings revert back? If so that is Smartport working.
You can disable it per interface or for the entire switch. Just note that when you disable it for the entire switch it will default all of the VLAN port settings, so you may just want to disable it for the switch ports.
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