The main thing is to remove the private ASN before propagating the updates to the rest of the Internet.
Please refer to the following document for more information:
http://www.ciscotaccc.com/kaidara-advisor/iprout/showcase?case=K20870214
Regards,
Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México