> # ST Port Characteristics

> ST ports have the following characteristics:

> - ST ports perform the RSPAN encapsulation of the FC frame.
> - ST ports do not use BB_credits.
> - One ST port can only be bound to one FC tunnel.
> - ST ports cannot be used for any purpose other than to carry RSPAN traffic.
> - ST ports cannot be configured using Storage Services Modules (SSMs).

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