3Com 4007, Implementation Manual, Page: 620 / 684

620 C
HAPTER
23: D
EVICE
M
ONITORING
Key Guidelines for
Implementation
To enable the monitoring of ports on a system, follow these general
steps:
1 Add the port on which you want to attach the network analyzer.
2
Start roving analysis.
a Select the port that you want to monitor.
b Enter the analyzer port’s MAC address.
The system provides commands to add and remove (define and undefine)
the analyzer port, to display the current analyzer and monitor ports, and
to start and stop analysis.
See the “Roving Analysis” chapter in the
Command Reference Guide
for
details.
Important
Considerations
■
The monitor port and the analyzer port must be on the same module.
■
On Layer 2 modules, you can connect one network analyzer to a
module
■
On Multilayer Switching Modules, you can connect as many network
analyzers as there are ports on the module, up to a maximum of 12.
■
The network analyzer cannot be located on the same bridge port as
the port that you want to monitor.
■
For more accurate analysis, attach the analyzer to a dedicated port
instead of through a repeater.
■
When the analyzer port is set, it cannot receive or transmit any other
data. Instead, it receives only the data from the port(s) to be
monitored.
■
If Spanning Tree Protocol was enabled on the analyzer port, it is
automatically disabled. When the analyzer port is undefined, the port
returns to its configured Spanning Tree state and functions as it did
before it was set as an analyzer port.
■
When you configure a port that is part of a virtual LAN (VLAN) as an
analyzer port, the port is removed from all VLANs of which it is a
member. When you remove the analyzer port, it becomes a member
of the default VLAN. You have to manually add it back to its original
VLANs.
■
You cannot use roving analysis to monitor trunk ports or resilient link
ports.