ProCurve 6200yl Management And Configuration Manual page 533

Monitoring and Analyzing Switch Operation
Traffic Mirroring
C a u t i o n
A mirroring exit port should be connected only to a network analyzer, IDS, or
other network edge device that has no connection to other network resources.
Allowing a mirroring exit port connection to a network can result in serious
network performance problems, and is strongly discouraged by ProCurve
Networking.
B-73