Application Example Diagnosing Switch Problems
page 35-20 OmniSwitch 6800/6850/9000 Network Configuration Guide March 2008
Creating a Mirroring Session
Before port mirroring can be used, it is necessary to create a port mirroring session. The port mirroring
source destination CLI command can be used to create a mirroring session between a mirrored (active)
port and a mirroring port. One (1) port mirroring session is supported in a standalone switch or in a stack
consisting of two or more switches. In addition, “N-to-1” port mirroring is supported, where up to 24
(OS6800) or 128 (OS6850/OS9000) source ports can be mirrored to a single destination port.
Note. To prevent the mirroring (destination) port from being blocked due to Spanning Tree changes, be
sure to specify the VLAN ID number (from 1 to 4094) for the port that will remain unblocked (protected
from these changes while port mirroring is active). This parameter is optional; if it is not specified,
changes resulting from Spanning Tree could cause the port to become blocked (default). See Unblocking
Ports (Protection from Spanning Tree) below for details.
To create a mirroring session, enter the port mirroring source destination command and include the port
mirroring session ID number and the source and destination slot/ports, as shown in the following example:
-> port mirroring 6 source 2/3 destination 2/4
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.
To create a remote port mirroring session, enter the port mirroring source destination command and
include the port mirroring session ID number, the source and destination slot/ports, and the remote port
mirroring VLAN ID as shown in the following example:
-> port mirroring 8 source 1/1 destination 1/2 rpmir-vlan 1000
This command line specifies remote port mirroring session 8, with the source (mirrored) port located on
slot 1/port 1, the destination (mirroring) port on slot 1/port 2, and the remote port mirroring VLAN 1000.
Note. Neither the mirrored nor the mirroring ports can be a mobile port. See Chapter 10, “Assigning Ports
to VLANs,” for information on mobile ports.
Creating an “N-to-1” port mirroring session is supported, where up to 24 (OS6800) or 128 (OS6850/
OS9000) source ports can be mirrored to a single destination port. In the following example, port 1/2, 2/1,
and 2/3 are mirrored on destination port 2/4 in session 1:
-> port mirroring 1 source 1/2 destination 2/4
-> port mirroring 1 source 2/1 destination 2/4
-> port mirroring 1 source 2/3 destination 2/4
As an option, you can specify a range of source ports and/or multiple source ports. In the following exam-
ple, ports 1/2 through 1/6 are mirrored on destination port 2/4 in session 1:
-> port mirroring 1 source 1/2-6 destination 2/4
In the following example, ports 1/9, 2/7, and 3/5 are mirrored on destination port 2/4 in session 1:
-> port mirroring 1 source 1/9 2/7 3/5 destination 2/4
In the following example, 1/2 through 1/6 and 1/9, 2/7, and 3/5 are mirrored on destination port 2/4 in
session 1:
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