A port (or trunk) that is a member of C-VLANs cannot be moved into the S-VLAN space with conflicting configurations for the S-VLAN mode. The following is a list of conflicting protocols/features. If a port has any of these enabled, the feature must be disabled before the port can be moved in to the S-VLAN space.
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An interface has to beGVRP-disabled to move it from the C-VLAN to the S-VLAN space. This is because S-VLANs of mixed VLAN mode do not support provider-GVRP, and also because a GVRP-enabled configuration (when the port is a C-VLAN member) is in the context of customer-GVRP which must be disabled before the port can operate in the S-VLAN space.
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Interface should not have any mirroring or monitoring sessions when moving between C-VLANs and S-VLANs. The configuration on all mirror/monitor sessions that involve the port must be removed.
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An interface that has auth-vid or unauth-vid configuration cannot move into the S-VLAN space. They have to be unset.
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Interfaces cannot have LACP enabled (active or passive modes) when moving into the S-VLAN space. They have be disabled.