The value to be used as the Authentication Key in Level 1
and Point-to-Point hello packets that are receivied from
the neighboring Systems, whenever the corresponding instance
of isisCircL1AuthType has a value of plaintext or md5.
Authentication of the received LSP is successful, when
authentication is successful on using any one of the
RecvPwd?. A modification of the corresponding instance of
isisCircL1AuthType does not modify the
hwIsisCircL1RecvPassword1 value.
Reading this object always results in an OCTET
STRING of length zero; authentication may not
be bypassed by reading the MIB object.