Inter bridge VLAN registration protocol for IP subnet VLAN

VLAN learning may be performed via inspection of the received frame. Some bridges will not be able to perform VLAN learning via frame inspection due to MAC bridging, VLAN filtering and IP routing process. End-stations attached to these bridges will not be able to join into their VLAN unless all the bridges exchange learnt VLAN information between each other. Exchange of learnt VLAN information will also prevent unnecessary forwarding of traffic to the network segment where VLAN membership no longer exists. A prototype implementation of the VLAN registration protocol for an IP subnet VLAN is described. Some recommendations for more efficient implementation are also given