Hello Ibrahim,
according to the following link
https://iebmedia.com/ethernet.php?id=9393&parentid=74&themeid=255&showdetail=true
ITU T G.8032 is a standardization of L2 protocols like Cisco RER (Resilient Ethernet Ring).
These protocols are L2 protocols specalized on ring topologies and are an alternative to RSTP or MST on these topologies providing less then 50 msec recovery time.
This protocol has been derived from SDH ring protection protocols but works on ethernet switches.
BFD is a Layer 3 protocol originally thought to provide IP fast convergence on point to point links using lightweight UDP messages instead of using low timers on routing protocols. BFD provides fast detection to protocols like OSPF, IS-IS, EIGRP and BGP.
BFD can be used also to validate static route next-hops.
In more recent times BFD has been extended to work in a LAN multipoint environment in an attempt to make it more scalable. The idea is to use multicast destination in BFD packets and listing inside all the BFD neighbors.
So G.8032 is an alternative to Rapid STP or MST in ring topologies and BFD performs fast detection at OSI layer 3 using UDP messages on point to point links.
Hope to help
Giuseppe
