You can do that either by using dot1q tunnelling or port based EoMPLS. For a description of these two features, please refer to the following document:
http://www.cisco.com/en/US/products/sw/iosswrel/ps5013/products_feature_guide09186a0080088187.html
Hope this helps,
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