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Unknown frame Src: fe:80:00:00:00:00 Dst: fc:11:20:f1:fc:e8

We are having some strange activity on the network, with intermittent slowing down. Wireshark scans produce multiple results from the same source frames are bombarding the network heavily:

Ethernet II, Src: fe:80:00:00:00:00 (fe:80:00:00:00:00), Dst: fc:11:20:f1:fc:e8 (fc:11:20:f1:fc:e8)

frame data shows nothing just same string in every packet and it looks like "T 4 P I" and some garbage.

image description

Any initial thoughts?