Using A Port Mirror For Analysis; Port Trunk Configuration - Alcatel OmniStack 8008 User Manual

Using a Port Mirror for Analysis

You can mirror traffic from any source port to a target port for real-time analysis. You
can then attach a network sniffer 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 configured in the same VLAN and be
operating at the same duplex mode as the source port (see VLAN Static List on page
3-27).
You can use the port mirror configuration screen to designate a single port pair for
mirroring as shown below:
Parameter
Status
Mirror Source Port
Mirror Target Port

Port Trunk Configuration

Port trunks can be used to increase the bandwidth of a network connection or to
ensure fault recovery. You can configure up four trunk connections (combining 2~4
ports into a fat pipe) between any two Omnistack
making any physical connections between devices, use the Trunk Configuration
menu to specify the trunk on the devices at both ends. When using a port trunk, note
that:
• Ports can only be assigned to one trunk.
• The ports at both ends of a connection must be configured as trunk ports.
• The ports at both ends of a trunk must be configured in an identical manner,
including duplex mode and VLAN assignments.
• None of the ports in a trunk can be configured as a mirror source port or mirror
target port.
• All the ports in a trunk have to be treated as a whole when moved from/to, added
or deleted from a VLAN.
• The Spanning Tree Algorithm will treat all the ports in a trunk as a whole.
• Enable the trunk prior to connecting any cable between the switches to avoid
creating a loop.
• Disconnect all trunk port cables or disable the trunk ports before removing a port
trunk to avoid creating a loop.
Description
Enables/disables port mirroring.
The port whose traffic will be monitored.
The port that will duplicate or "mirror" all the traffic happening on the
monitored port.
Using a Port Mirror for Analysis
® 8008 switches. However, before
3-37