Light module is to use the cisco single module, plug in to use the Access connection without any problems, but instead to trunk can't communication, I use the mouth is normal, what problem, consult!


I A switch to establish vlan20, B switches establish vlan20, two switch the same model, level connection mouth is light, the access is normal, no problem, trunk is impassability, why?

CodePudding user response:

Both light mouth on VLAN20? If in, then use the access, or both is set to the trunk, pay attention to is not belong to any VLAN trunk, some switches may provide a trunk allow through which VLAN