I doublechecked it. Using fence-agents from HAE repository does not work with ipmilan, using an elder version from http://ftp.gwdg.de/pub/opensuse/repo....17.x86_64.rpm works.
Is it really possible that the official version from the HAE repository does not work, but an elder one i found in the internet, which is intended to be for SLES 11 SP2 ?
When i run now a zypper up my working fencing configuration is lost :-((.