/mcpOf Exit [FPOE] can be misprogrammed, which can cause packets to be directed to the wrong Fabric exit channel and sent to the wrong linecards. The result is that they are looped back to the Fabric and replicated multiple times when they exit on the correct linecard.
<#root> C6509# show mls ip multicast capability Current mode of replication is Egress Auto replication mode detection is ON
Slot Multicast replication capability 1 Egress 2 Egress 3 Egress 4 Egress 5 Egress 6 Egress 7 Egress
Possible Fix 2 As a workaround, change to ingress replication mode. During a change from egress- to ingress-replication mode, traffic interruptions can occur because the shortcuts are purged and reinstalled.
mls ip multicast replication-mode ingress
Upgrade the Cisco IOS software to a release not affected by Cisco bug ID CSCeg28814 in order to permanantly resolve the issue.