Configure your Cisco switch to capture data/voip traffic by mirroring incoming – outgoing packets with SPAN on Catalyst 2940, 2950, 2955, 2960, 2970, 3550,3560, 3560−E, 3750 and 3750−E, 4507R Series Switches. Network monitoring via packet capturing-sniffing software, network analyser, IDS or IPS is possible using Cisco’s SPAN or RSPAN method covered extensively in this article. Understand SPAN Terminology.
http://www.firewall.cx/cisco-technical-knowledgebase/cisco-switches/940-cisco-switches-span-monitoring.html
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