47
Fault Tolerance
•Non-minimal
adaptive routers are inherently fault-tolerant because a faulty neighbor
is indistinguishable
from a busy neighbor
•Chaos
router requires special design considerations to be fault tolerant …
•Back
out of an output frame
•Packet
reassembly is a good place to recognize lost packets … but they may just be
slow
•Time out on reassembly, force a halt, deliver everything,
apply
diagnostics, restart if everything is OK