La. Stat. tit. 33 § 4288
The governing authority of a municipality which issues certificates of indebtedness under this Sub-part, may authorize the issuance of certificates of indebtedness for the purpose of refunding outstanding certificates.
Refunding certificates may either be sold and the proceeds applied to the retirement of the outstanding certificates, or may be delivered in exchange for the outstanding certificates. The refunding certificates shall be authorized in all respects as original certificates are herein required to be authorized, and the governing authority shall provide for the security of the refunding certificates and for the rights of the holders thereof in all respects as those herein authorized to be provided for under the authority of this Sub-part. The governing authority may also provide that the refunding certificates shall have the same priority of lien on the revenues pledged for their payment as was enjoyed by the certificates refunded.
La. R.S. § 33:4288