This is completely dependant on the switch. Some switches have it as a configurable option. Other switches decide whether or not to use dot1q trunk headers based on whether or not the port was made a trunk. On other switches is part of the span command itself. On yet other switches the span will always be dot1q packets and is not user configurable. And finally on other switches the span packets never have dot1q packets.
The only way to know is to closely read the documentation for your particular switch. Even different versions on the switch may act differently for span so be sure to check the documentation for your specific version.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...