BFD Generic Cryptographic Authentication
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This document proposes an extension for Bidirectional Forwarding
Detection (BFD) to allow the use of any cryptographic authentication
algorithm in addition to the already documented authentication
schemes, described in the base specification. Although this
document has been written specifically to introduce two new
Authentication types it describes how BFD can use National Institute
of Standards and Technology (NIST) Secure Hash Standard family of
algorithms (SHS) to authenticate the control packets, the method
described in this document is generic and can be used to extend BFD
to support any cryptographic hash function in the future.