Started with IOS 12.4(20)T version, EPC or Embedded Packet Capture, is a powerful feature to capture data packets flowing through, to, and from, a Cisco router. In contrast with SPAN feature, EPC permits to save the dump directly on the NVRAM and for this reason, Embedded Packet Capture is useful whenever a network protocol analyzer might be useful in debugging a problem, but when it's not practical to install such a device.
Info: http://www.ciscozine.com/2011/06/22/epc-an-embedded-packet-capture/
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