Alcatel Carrier Internetworking Solutions Switch/Router 사용자 설명서

Page 19-58

where 

 is the slot number of the module containing the mirrored port, and 

 is the 

port number of the mirrored port. For example, if the Admin Status of a port displayed as

then you would know this port is mirroring traffic for Port 2 on the module in Slot 3.

If a cable is not attached to the Mirrored port, port mirroring will not take place. In this case, 
the Mirroring Port reverts back to its normally operational state and will bridge frames as if 
port mirroring were disabled.

Port mirroring is a helpful monitoring tool when used in conjunction with an external 

RMON

 

probe. Once you set up port mirroring, the probe can collect all relevant 

RMON

 statistics for 

traffic on the mirrored port. You can also move the Mirrored Port so that the Mirroring Port 
receives data from different ports. In this way, you can roam the switch and monitor traffic at 
various ports.

If you attach an external 

RMON

 probe to a mirroring port, that probe must have an IP address 

that places it in the same 

VLAN

 as the mirrored port. In addition if you change the mirrored 

port, then you must again make sure that the 

RMON

 probe is in the same 

VLAN

 as that new 

mirrored port.

Frames received from an 

RMON

 probe attached to the Mirroring Port can be seen as being 

received by the Mirrored Port. These frames from the Mirroring Port are marked as if they are 
received on the Mirrored Port before being sent over the switch backplane to an 

NMS

 station. 

Therefore, management frames from an 

NMS

 station that are destined for the 

RMON

 probe are 

first forwarded out the Mirrored Port. After being received on the Mirrored Port, copies of the 
frames are mirrored out the Mirroring Port—the probe attached to the Mirroring Port receives 
the management frames. The illustration on the following page shows this data flow.

Must be in same VLAN.