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"memory allocation failed" when configuring NetFlow with SCTP

After I configured a 2811 router with "ip flow-export destination 10.10.100.100 9995 sctp", the router showed errors of  "%SYS-2-MALLOCFAIL: Memory allocation of 1708 bytes failed from 0x40394258, alignment 32, Pool: I/O  Free: 480  Cause: Not enough free memory". After that OSPF adjacency came down and router became non-responding. Here is the complete NetFlow config:

ip flow-export source Loopback0

ip flow-export version 9

ip flow-export destination 10.10.100.100 9995 sctp

backup destination 10.10.100.101 9995

backup mode fail-over

                

Does "ip flow-export sctp" command have memory requirement? I searched Cisco command reference but didn't see any. Have anyone seen similar errors on other router platforms or IOS? I'm running IOS 12.4(24)T2 advanced enterprise.

Thanks

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