Why cannot information be displayed after an instance with a non-zero instance ID is configured on an S series switch

S (except the S1700) series switches support the MSTP protocol, which is compatible with STP and RSTP. An instance with a non-zero instance ID takes effect only in MSTP mode. When STP works in STP or RSTP mode, only instance 0 takes effect. To query information about an instance with a non-zero instance ID, run the stp mode mstp command to set the STP working mode to MSTP.

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