transmission.
In case PCs in the same VLAN can't communication with each other, you should check:
1、VLANs already existent:
Switch# show vlan
member port information for related VLANs
switch# show vlan 2
vlan 2 port map
(-=None,M=Tagged,U=Untagged)
switch# show vlan 3
vlan 2 port map