Restrictions for Configuring Link-State Tracking
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You can configure only two link-state groups per switch.
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An interface cannot be a member of more than one link-state group.
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An interface that is defined as an upstream interface in a link-state group cannot also be defined as a downstream interface in the link-state group.
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Do not enable link-state tracking on individual interfaces that will part of a downstream EtherChannel interface.
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Add the upstream interfaces to the link state group before adding the downstream interfaces. Otherwise, the downstream interface is put in error-disabled state.
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When a downstream interface is configured as a SPAN destination port, it is placed in error-disabled state when all upstream interfaces in its group are down. When an upstream interface is configured as a SPAN destination port, it is considered as a link-down event on the interface.