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12sept/16

Oracle RAC 11gR2 need multicast

After AIX / Oracle RAC migration to new Datacenter, the DBA encountered a problem to start Oracle RAC with network heartbeat error...
Root cause: Network Team has dropped multicast beetween Datacenter.

cat $GRID_HOME/log/grac2/cssd/ocssd.log
2016-09-11 21:15:55.296: [    CSSD][382113536]clssnmPollingThread: node 2, orac002 (1) at 90% heartbeat fatal, removal in 2.950 seconds, seedhbimpd 1
2016-09-11 21:15:56.126: [    CSSD][388421376]clssnmvDHBValidateNCopy: node 2, orac002, has a disk HB, but no network HB, DHB has rcfg 269544449, wrtcnt, 547793, LATS 2298

Workaround: Run tcpdump and grep multicast MAC on Oracle Interconnect Interface and send multicast address for Network Team. That's work better after.

root@orac002:/root #  tcpdump -en -i en0 |  grep "01:00:5e"

21:43:24.678611 76:82:b2:99:ac:0b > 01:00:5e:00:00:fb, ethertype IPv4 (0x0800), length 1202: 192.168.10.217.42424 > 224.0.0.251.42424: UDP, length 1160
21:43:24.678798 76:82:b2:99:ac:0b > 01:00:5e:00:01:00, ethertype IPv4 (0x0800), length 1202: 192.168.10.217.42424 > 230.0.1.0.42424: UDP, length 1160

Oracle Doc ID 1212703.1
Bug 9974223 : GRID INFRASTRUCTURE NEEDS MULTICAST COMMUNICATION ON 230.0.1.0 ADDRESSES WORKING

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