* [[http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a008015c612.shtml#topic5|Catalyst Switched Port Analyzer (SPAN) Configuration Example]]
  * [[http://www.cisco.com/en/US/docs/switches/lan/catalyst2950/software/release/12.1_19_ea1/configuration/guide/swspan.html|Configuring SPAN and RSPAN]]
  * [[https://supportforums.cisco.com/docs/DOC-3693|The limitations of SPAN and RSPAN on the Cisco Catalyst 2950, 3550, 3560 and 3750 swtiches]]