| 摘要 |
An edge Bridge ( 2 A) executes Ethernet encapsulation. Even when redundant MAC addresses are used in the network of a customer, the MAC address of the customer is not referred to in a backbone network ( 1 ). Since forwarding is done on the basis of a MAC address added by the edge Bridge ( 2 A), correct forwarding is possible. Additionally, in the edge Bridge ( 2 A), a Service VLAN ID based on the customer-facing port which has received a customer MAC frame and the VLAN ID in the customer MAC frame is added to the customer MAC frame, thereby building a completely closed network for each customer. The customer can belong to a plurality of Service VLANs through a single customer-facing port and select, by a VLAN ID, a Service VLAN to which he/she should belong.
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