Port Spanning question

TechGromitTechGromit Completely CluelessOntario, NY Posts: 1,855Member ■■■■■■■□□□
I have a request to do a port span an interface on a Cisco 6500 series switch, the official Cisco documents I read last updated in 2014 say that port spanning has no impact on a switches performance, but some sources I've read say that when you get into the 1 gigabit full duplex range, this starts to have an impact on a switches performance. Opinions on this? Thanks.
Still searching for the corner in a round room.
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