UplinkFast has sense in the case there are blocked ports on the switch (backup root paths).
1) In your topology:
Who is the root?
And who is blocking the 100Mbps port?
If it is a Cisco switch blocking 100Mbps port it has a sence to enable UplinkFast on it.
2) AFAIK, there is no UplinkFast protocol.
UplinkFast is using flood dummy packets with the different MAC addresses
that the switch has in its CAM table as a source. Its destination is a Cisco proprietary multicast MAC address that ensures that the packet will be flooded on the whole network and will update the necessary CAM tables on the other switches.
So there should be no problem with Cabletron receiving these multicasts.
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