This excerpt is from David Hucaby CCNP Switch - page 356, "when the local SPAN is enabled, STP is disabled on the destination port. This allows STP BPDUs to be captured and monitored but also allows the possibility for a bridging loop to form. NEVER CONNECT A SPAN SESSION'S DESTINATION PORT BACK INTO AN ACTIVE NETWORK". If STP is disabled why can't we connect port back and what disruption will it do to the network?
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SPAN
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I believe the answer is exactly what you've mentioned
STP is disabled.. Remember that without STP, bridging loop form. If you're adding a port which cannot be configured to work with STP then this port will remain open and BPDUs can come in from this port, when they are not supposed to.Cordially,
Ronnie Wong
Edutainer, ITProTV**if the post above has answered the question, please mark the topic as solved.
