1. Ethernet private line (EPL)
The EPL has two service access points, which are used to transparently transmit the Ethernet MAC frames of users in a point-to-point manner. Different users do not need to share SDH bandwidths. Therefore, there are strict bandwidth guarantee and user isolation mechanisms, and other QoS and security mechanisms are not required. MAC addresses do not need to be learned because it is point-to-point transmission.
2. Ethernet virtual private line (EVPL)
The major difference between EVPL and EPL lies in that different EVPL users need to share SDH bandwidths. Therefore, VLAN IDs or other mechanisms are required to distinguish user data. A QoS mechanism is required if different service qualities need to be provided for different users. If sufficient bandwidth resources are configured, EVPL services similar to EPL services can be provided.

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