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"If the A bit is set and no authentication is in use (bfd.AuthType is zero), the packet MUST be discarded."
"If the A bit is clear and authentication is in use (bfd.AuthType is nonzero), the packet MUST be discarded."
How do we know the value of bfd.AuthType? Is it a configured value or is it derived from the "Auth Type" field of the received BFD packets? if it is derived from received BFD packets the value zero is reserved for "Auth Type" and is not defined.
Any explanations?
Also I noticed that the text says SHA1 is mandatory and others are optional. Which SHA1 does it mean? the Keyed or Meticulous Keyed SHA1? Can we change then Mandatory to Simple Password?
Thanks,
Shahram