RSPAN & CDP issue

I ran into an issue last night with a lab and while troubleshooting the issue I noticed that there were a number of CDP devices showing up on a trunk port that did not belong on that trunk port.

By process of elimination I was able to isolate the issue to a monitor session I had with RSPAN.

Just wondering if this is normal when using RSPAN that any device on the source VLAN may show up as belonging to trunk port links?

For reference this was on real hardware, cisco 3750's and 3845's.

Thanks in advance for any input.

Andy

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