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Cisco® Field Manual: Catalyst® Switch Configuration by Steve McQuerry, Dave Hucaby

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12-3. Switched Port Analyzer

  • Switched Port Analyzer (SPAN) mirrors traffic from one or more source switch ports or a source VLAN to a destination port. This allows a monitoring device such as a network analyzer to be attached to the destination port for capturing traffic.

  • SPAN source and destination ports must reside on the same physical switch.

  • Multiple SPAN sessions can be configured to provide several simultaneous monitors.

  • Remote SPAN (RSPAN) provides traffic mirroring from a source on one switch to a destination on one or more remote switches.

  • RSPAN is carried from source to destination over a special RSPAN VLAN.

  • RSPAN is only available on the Catalyst 4000 and 6000 switch families.

NOTE

What happens if a speed mismatch occurs between the SPAN ...

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