SMC Networks TigerStack 100 1000BASE-X - Manual (Page 62)

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Using a Mirror Port for Analysis
You can mirror traffic from any source port 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 port in a completely
unobtrusive manner. When mirroring port traffic, note that the target port
must be included in the same VLAN as the source port. (See “Configuring
Virtual LANs” on page 2-56.)
You can use the Mirror Port Configuration screen to designate a single
port pair for mirroring as shown below.
Mirror Port Configuration
=========================
Mirror Source Port : Unit 1
Port 1
Mirror Target Port : Unit 1
Port 2
Status : DISABLED
<APPLY> <OK> <CANCEL>
Use <TAB> or arrow keys to move, other keys to make changes.
Parameter Description
Mirror Source Port The port whose traffic will be monitored.
Mirror Target Port The port that will duplicate or “mirror” all the traffic
happening on the monitored port.
Status Enables or disables the mirror function.