Design considerations for BFD authentication

Supported BFD authentication modes

As per section 6.7 of RFC 5880, "implementations supporting authentication MUST support both types of SHA1 authentication. Other forms of authentication are optional." For the first release, only Keyed SHA1 and Meticulous Keyed SHA1 authentication schemes will be supported as per the RFC requirement.

Multiple authentication keys on a specific VLAN can not be configured. Each VLAN can have only one Authentication key to be configured.