[c-nsp] BFD, MPLS/Eth OAM, VRRP, FRR, RPR

[Kim Onnel]

Hello,

I have never worked with the above protocols, the only thing in common
between them is that they all sort of help networks to have high
availability, but its getting confusing actually, can anyone please
correct me if i am wrong about what they simply do:

BFD: a protocol that establishes a session between routers and
periodicly sends messages to detect router failure, not specific to
routing protocol or anything else, just some sort of smart ping, is
there anything more to it ? can it for example report to MPLS or IGP
or BGP its state ?

MPLS/Ethernet OAM: I have no idea what Ethernet OAM is but i know MPLS
OAM is also some sort of LSP failure detection method, it keeps
sending those CV/FFD and waits for BDI and if that fails it can
instruct control plane to take a different LSP

FRR: I thought thats for the purpose of configuring a backup LSP, so
what does it have that MPLS OAM doesnt do.

RPR: some sort of a datalink layer protocol that detects failure in a
ring topology and chooses a different path but thats all L2 only

VRRP: in an MPLS network, 2 PEs could run VRRP between them and be
able to run the MPLS VPNs in case one PE fails ?

Sorry if my description seems to lack alot of knowlege but its just
confusing, i'd welcome suggestions on a good source for the above
subjects, i've tried RFCs and drafts but they are too detailed and
related to be able to read them to get a high level idea of what they
do.

Private discussions are welcomed

Thanks,
Kim