This reports the VLAN sharing type, per CucsFabricAVlanSharing, configured for this specific VLAN -- e.g. whether it's a standard, primary, isolated, or community private VLAN. This field on this row determines the actual traffic isolation behavior for devices on this specific VLAN; getting it wrong, e.g. expecting isolation but the VLAN is actually configured as a standard non-PVLAN type, would mean hosts that were supposed to be isolated from each other can actually communicate. A sharing value of 'isolated' on this specific VLAN means hosts on it can talk to the primary VLAN's promiscuous ports but not to each other directly.