Have you ever done HCNP routing and switching experiment guide experiment 8.4 Co

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I would like to ask this question: is the serious fault hidden trouble the problem of RSTP? The G0 / 0 / 2 port of S4 is blocked, which makes S4 unable to connect with G0 / 0 / 2 of S2 through G0 / 0 / 2. I wonder if we can solve this problem by using the dual instance of MSTP and different main standby. It‘s too late. We are not testing accurately. Please give us some advice