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Software Configuration Guide—Release 12.2(25)SG
OL-7659-03
Chapter 37 Configuring SPAN and RSPAN
Configuring SPAN
• Configuration Scenario, page 37-10
• Verifying a SPAN Configuration, page 37-10
Note Entering SPAN configuration commands does not clear previously configured SPAN parameters. You
must enter the no monitor session command to clear configured SPAN parameters.
SPAN Configuration Guidelines and Restrictions
Follow these guidelines and restrictions when configuring SPAN:
• You must use a network analyzer to monitor interfaces.
• You cannot mix source VLANs and filter VLANs within a SPAN session. You can have source
VLANs or filter VLANs, but not both at the same time.
• EtherChannel interfaces can be SPAN source interfaces; they cannot be SPAN destination interfaces.
• When you specify source interfaces and do not specify a traffic type (Tx, Rx, or both), “both” is used
by default.
• If you specify multiple SPAN source interfaces, the interfaces can belong to different VLANs.
• You must enter the no monitor session number command with no other parameters to clear the
SPAN session number.
• The no monitor command clears all SPAN sessions.
• SPAN destinations never participate in any spanning tree instance. SPAN includes BPDUs in the
monitored traffic, so any BPDUs seen on the SPAN destination are from the SPAN source.