Dell PowerConnect B-FCXs Configuration Manual page 683

Configuration notes
The following rules apply to VLAN-Based Mirroring configurations.
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PowerConnect B-Series FCX Configuration Guide
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A VLAN must have at least one port member configured before "monitor" can be configured.
Multiple VLANs can have monitor enabled at the same time, and the maximum number of
monitor-configured VLANs is 8.
The mirror port is subject to the same scheduling and bandwidth management as the other
ports in the system. If the amount of traffic being sent to the mirror port exceeds the available
bandwidth, some of that traffic may be dropped.
All incoming traffic (tagged and untagged) in the VLAN is mirrored. Mirroring is "as-is", and is
not affected by the configuration of the mirror port itself. Incoming tagged traffic is sent out
tagged and incoming untagged traffic is sent out untagged, regardless of which VLANs the
mirror port belongs to, and whether the mirror port is tagged or untagged.
This feature is supported on Layer 2 and Layer 3 images.
VLAN-based mirroring
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