> # SD Port Characteristics

> An SD port has the following characteristics:

> - Ignores BB_credits.
> - Allows data traffic only in the egress (Tx) direction.
> - Does not require a device or an analyzer to be physically connected.
> - Supports only 1 Gbps or 2 Gbps speeds. The auto speed option is not allowed.
> - Multiple sessions can share the same destination ports.
> - If the SD port is shut down, all shared sessions stop generating SPAN traffic.
> - The outgoing frames can be encapsulated in Extended Inter-Switch Link (EISL) format.
> - The SD port does not have a port VSAN.
> - SD ports cannot be configured using Storage Services Modules (SSMs).
> - The port mode cannot be changed if it is being used for a SPAN session.

> Note If you need to change an SD port mode to another port mode, first remove the SD port from all sessions and then change the port mode.

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