This feature has been available since 12.0(22)S.
For more information on the availability of this feature or any other feature, please use the Feature Navigator on CCO:
http://tools.cisco.com/ITDIT/CFN/jsp/index.jsp
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