Per-SAP loopback with MAC swap is only supported on the 7210 SAS-K 2F1C2T, 7210 SAS-K 2F6C4T, and 7210 SAS-K 3SFP+ 8C.
The 7210 SAS-K 2F1C2T, 7210 SAS-K 2F6C4T, and 7210 SAS-K 3SFP+ 8C provide per-SAP loopback support with MAC swap. When the SAP loopback command is enabled, all the packets that are sent out the SAP configured with loopback are looped back at the egress of the SAP back into the ingress of the SAP. The node swaps the MAC addresses before the packet hits the ingress of the SAP. After it is received back at SAP ingress, it processes these packets as per the service configuration for the SAP. Only traffic sent out of the test SAP is looped back. The loopback does not affect other SAPs and services configured on the same port. Per-SAP loopback is supported for use with both VPLS and Epipe services.