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Why "out bcast pkts" on a frame-relay PVC created on a subinterface?

On a Cisco3640 running IOS 12.2(6) IP-only the number of "out bcast pkts" and "out bcast bytes" are increasing even when on the subinterface CDP is disabled and the subinterface is passive for the routing protocol.Debugging the broadcast packets (on the router on the other side of the F/R PVC) learned me that the broadcast traffic is tftp traffic with source address the ip-address of the subinterface and destination address 255.255.255.255.Is it possible to stop this kind of traffic?It seems that this kind of traffic is related to the auto-install topic through tftp but I can't find the link.

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