BIRD in Mininet

Hello everyone, I tried to run BIRD in Mininet but it failed with the error "I found another BIRD running". The calls look something like this: /usr/lib/bird -c routerID.conf -P /tmp/routerID.pid > routerID.log 2>&1 Does anyone know how to run multiple instances of BIRD in this manner within Mininet or is it possible at all? Thank you in advance, Mario Cekic