Troubleshooting traffic mirroring
If mirrored traffic does not reach the configured remote destination (endpoint) switch or remote exit port, check the following configurations:
If the destination for mirrored traffic is on a different VLAN than the source, routing must be correctly configured along the path from the source to the destination.
CAUTION:
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. Configuring a mirroring exit port connection to a network can result in serious network performance problems, and is strongly discouraged.