User`s manual

TN-5516/5518 Series Featured Functions
3-69
Using Diagnosis
The TN-5500 provides two important tools for administrators to diagnose network systems.
Mirror Port
The Mirror port function can be used to monitor data being transmitted through the specific ports. This is done
by setting up another port (the mirror port) to receive the same data being transmitted from, or both to and
from, the ports under observation. This allows the network administrator to sniff the observed ports and thus
keep tabs on network activity.
Take the following steps to set up the Mirror Port function:
STEP 1
Configure TN-5500’s Mirror Port function from either the Console utility or Web Browser interface. You will
need to configure three settings:
Monitored Port Select the port number for all ports whose network activity will be monitored.
Mirror Port Select the port number for all ports that will be used to monitor the activity of the
monitored ports.
Watch Direction Select one of the following two watch direction options:
• Input data stream
Select this option to monitor only those data packets coming into the TN-5500’s
ports.
• Output data stream
Select this option to monitor only those data packets being sent out through
TN-5500’s ports.
• Bi-directional
Select this option to monitor data packets both coming into, and being sent out
through, the TN-5500’s ports.
STEP 2
Be sure to activate your settings before exiting.
• When using the Web Browser interface, activate by clicking on the Activate button.
• When using the Console utility, activate by first highlighting the Activate menu option, and then press
Enter. You should receive the Mirror port settings are now active! (Press any key to continue)
message.