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If it is reported and identified (by a SR and AWR) as a network problem, why are you posting the problem to an Oracle RAC forum?
Surely you need network and router administration/configuration/troubleshooting assistance, and not Oracle RAC?
To pin point this issue , you can do below things
1.Gather N/W stats (usinf some monitoign tool like cacti) on n/w interface for incoming/outgoing traffic between specific time period when problem is faced
2.Also Get nmon report (being AIX , nmon can be configured) to identify the processess causing huge n/w IO
3.Typical Process & their utilization in step 1/2 can be linked to AWR/Statspack taken for problematic time period to identify module/sql's causing this issue
What's the error?
are you doing backups over your network??? Some of network backup utilities can easily overrun the network.