When the value of tmnxMsdpPeerAuthKeyEncrypted is 'true', the
password specified by tmnxMsdpPeerAuthKey is in the encrypted
form.
When the value of tmnxMsdpPeerAuthKeyEncrypted is 'false', the
password specified by tmnxMsdpPeerAuthKey is in plain text.
tmnxMsdpPeerAuthKey and tmnxMsdpPeerAuthKeyEncrypted, which indicates
whether or not the password string is encrypted, must be set
together in the same SNMP request PDU or else the set request
will fail with an inconsistentValue error.