现象：
11.2.0.3 Grid Infrastructure/RAC database CVU/OUI multicast communication check fails:
Checking multicast communication…
Checking subnet “10.47.99.200” for multicast communication with multicast group “230.0.1.0”…
PRVG-11134 : Interface “10.47.99.1” on node “racnode1” is not able to communicate with interface “10.47.99.2” on node “racnode2”
The issue can happen during either fresh install or upgrade.
原因：
Due to bug 14516955
Duplicates: bug 14580001 bug 14311097
解决方法：
The bug is fixed in 11.2.0.4 and above. As 11.2.0.3 cssd uses both broadcast and multicast on private network to bootstrap, the warning can be ignored.
参考文档：
Linux: 11.2.0.3 Multicast Communication Failure: PRVG-11134 : Interface “n.n.n.n” on node “racnode1” is not able to communicate with interface “n.n.n.n” on node “racnode2” (文档 ID 1395273.1)
