Unblocking Ports (Protection From Spanning Tree); Enabling Or Disabling Mirroring Status - Alcatel OmniSwitch 6800 Series Network Configuration Manual

Port Mirroring
This command line specifies mirroring session 6, with the source (mirrored) port located in slot 2/port 3,
and the destination (mirroring) port located in slot 3/port 4.
Note. Neither the mirrored nor the mirroring ports can be a mobile port. See
to VLANs," for information on mobile ports.
Only one destination per standalone switch or two or more switches in a stack is supported. However, the
same destination port can be shared by up to four sessions. In the following example sessions 1, 5, and 6
mirror source ports 1/2, 2/1, and 2/3 on destination port 2/4:
-> port mirroring 1 source 1/2 destination 2/4
-> port mirroring 5 source 2/1 destination 2/4
-> port mirroring 6 source 2/3 destination 2/4

Unblocking Ports (Protection from Spanning Tree)

If the mirroring port will monitor mirrored traffic on an RMON probe belonging to a different VLAN than
the mirrored port, it should be protected from blocking due to Spanning Tree updates. To create a mirror-
ing session that protects the mirroring port from being blocked (default) due to changes in Spanning Tree,
enter the port mirroring source destination
number, source and destination slot/ports, and unblocked VLAN ID number, as shown in the following
example:
-> port mirroring 6 source 2/3 destination 2/4 unblocked 750
This command line specifies mirroring session 6, with the source (mirrored) port located in slot 2/port 3,
and the destination (mirroring) port located in slot 2/port 4. The mirroring port on VLAN 750 is protected
from Spanning Tree updates.
Note. If the unblocked VLAN identifier is not specified, the mirroring port could be blocked due to
changes in Spanning Tree.

Enabling or Disabling Mirroring Status

Mirroring Status is the parameter by which you can enable or disable a mirroring session (i.e., turn port
mirroring on or off). There are two ways to do this:
Creating a Mirroring Session and Enabling Mirroring Status or Disabling a Mirroring Session
•
(Disabling Mirroring Status). These procedures are described below and on the following page.
Enabling or Disabling a Port Mirroring Session—"shorthand" versions of the above commands that
•
require fewer keystrokes. Only the port mirroring session ID number needs to be specified, rather than
the entire original command line syntax (e.g., source and destination slot/ports and optional unblocked
VLAN ID number). See
for details.
Note. A port that is part of an aggregate link cannot be mirrored.
page 24-12
CLI command, and include the port mirroring session ID
"Enabling or Disabling a Port Mirroring Session (Shorthand)" on page 24-14
OmniSwitch 6800 Series Network Configuration Guide
Diagnosing Switch Problems
Chapter 6, "Assigning Ports
November 2004