Port Mirroring - Linksys LGS308 User Manual

• Timeout—Enter the length of time that the system waits for a frame to return
before declaring it lost, or select Use Default.
3. Click Start. The operation is performed.
A page appears showing the Round Trip Time (RTT) and status for each trip in free text containing
the following information:
• Index—Displays the number of the hop.
Host—Displays a stop along the route to the destination.
•
• Round Trip Time (1-3)—Displays the round trip time in (ms) for the first through third
frame and the status of the first through third operation.

Port Mirroring

Port mirroring is used on a network device to send a copy of network packets seen on one or
multiple device ports, to a network monitoring connection on another port on the device. This is
commonly used for network appliances that require monitoring of network traffic, such as an
intrusion-detection system. A network analyzer connected to the monitoring port processes the
data packets for diagnosing, debugging, and performance monitoring. Up to four sources can be
mirrored. This can be any combination of four individual ports.
A packet that is received on a network port assigned to a VLAN that is subject to mirroring is
mirrored to the analyzer port even if the packet was eventually trapped or discarded. Packets
sent by the device are mirrored when Transmit (Tx) mirroring is activated.
Mirroring does not guarantee that all traffic from the source port(s) is received on the analyzer
(destination) port. If more data is sent to the analyzer port than it can support, some data might be
lost.
Only one instance of mirroring is supported system-wide. The analyzer port is the same for all the
mirrored ports.
To enable mirroring:
1. Click Maintenance > Diagnostics > Port Mirroring.
The following fields are displayed:
• Destination Port—Port to which traffic is to be copied; the analyzer port.
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