Reject route

Hi !!! I need reject one route to AS coming from one AS particular... Is there are possibility ? The objective are use other link to upstream... Thank so much ! Elder Costa Network Analyst / Analista de Redes Phone / Telefone (+55) 019 3522-8310 Extension / Ramal 288 elder.costa@talklink.com.br [ mailto:rafael.menicatti@talklink.com.br ]