Why is the MAC address of a BPDU replaced with a multicast MAC address in BPDU tunneling on S series switches

On S series (except the S1700) and E series switches, the MAC address of a BPDU from a user-side device is replaced so that the BPDU can be transparently transmitted across the ISP network. Otherwise, the BPDU will be processed by the ISP network as a protocol packet and cannot reach the remote user-side device, and network flapping will occur.

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