> # RSPAN Configuration Guidelines

> The following guidelines apply for a SPAN configuration:

> - All switches in the end-to-end path of the RSPAN tunnel must belong to the Cisco MDS 9000 Family.
> - All VSANs with RSPAN traffic must be enabled. If a VSAN containing RSPAN traffic is not enabled, it is dropped.
> - The following configurations must be performed on each switch in the end-to-end path of the Fibre Channel tunnel in which RSPAN is to be implemented:
> - Trunking must be enabled (enabled by default) and the trunk enabled link must be the lowest cost link in the path.
> - VSAN interface must be configured.
> - The Fibre Channel tunnel feature must be enabled (disabled by default).
> - IP routing must be enabled (disabled by default).

> Note If the IP address is in the same subnet as the VSAN, the VSAN interface does not have to be configured for all VSANs on which the traffic is spanned.

> - A single Fibre Channel switch port must be dedicated for the ST port functionality.
> - Do not configure the port to be monitored as the ST port.
> - The FC tunnel’s IP address must reside in the same subnet as the VSAN interface.

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