LevelOne FGL-2870 - Manual (Page 290)

Configuring the Switch
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CLI – This example shows the switch configured with Protocol Group 2 mapped to
VLAN 2.
Configuring VLAN Mirroring
You can mirror traffic from one or more source VLANs to a target port for real-time
analysis. You can then attach a logic analyzer or RMON probe to the target port and
study the traffic crossing the source VLAN(s) in a completely unobtrusive manner.
Command Usage
• All active ports in a source VLAN are monitored for ingress traffic only.
• All VLAN mirror sessions must share the same target port.
• When VLAN mirroring and port mirroring are both enabled, they must use the same
target port.
• When VLAN mirroring and port mirroring are both enabled, the target port can
receive a mirrored packet twice; once from the source mirror port and again from
the source mirrored VLAN.
• The target port receives traffic from all monitored source VLANs and can become
congested. Some mirror traffic may therefore be dropped from the target port.
Note: Spanning Tree BPDU packets are not mirrored to the target port .
Command Attributes
• Mirror Sessions – Displays a list of current mirror sessions.
• Source VLAN – A VLAN whose traffic will be monitored. (Range: 1-4094)
• Target Port – The destination port that receives the mirrored traffic from the source
VLAN. (Range: 1-28/52)
Web – Click VLAN, VLAN Mirror Configuration. Select the source VLAN, select a
target port that is not a member of the source VLAN, and click Apply.
Figure 3-135 VLAN Mirror Configuration
Console(config)#protocol-vlan protocol-group 2 vlan 2 4-322
Console(config)#