Cisco Cisco IOS Software Release 12.4(24)T Fascicule

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Multicast FNF provides the ability to collect specific 
characteristics of Multicast Flows:

Support for IPv4 Multicast Flows

Account for replicated packets in both ingress and 
egress directions

Capture ingress reverse path forwarding (RPF) drops

Export multicast related information in V9 format

Allow replication factor to be collected as both a key 
and non-key field