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Cisco Bug: CSCut02317 - prm_server_to runs out of memory with non-contiguous high scale RIB

Last Modified

Aug 06, 2018

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases


Description (partial)

prm_server_to or prm_server_ty memory consumption is unexpectedly high. If the allocated maximum is reached, the process crashes:

LC/0/2/CPU0:Feb 17 10:56:32.702 : dumper[55]: %OS-DUMPER-7-DUMP_REQUEST : Dump request for process pkg/bin/prm_server_to 
LC/0/2/CPU0:Feb 17 10:56:32.705 : dumper[55]: %OS-DUMPER-7-DUMP_ATTRIBUTE : Dump request with attribute 7 for process pkg/bin/prm_server_to 
LC/0/2/CPU0:Feb 17 10:56:32.705 : dumper[55]: %OS-DUMPER-4-SIGNAL_NUMBER : Thread 1 received SIGNAL 31, si code 0, si errno 0

Observed on Typhoon and Tomahawk generation of line cards of the ASR9000 series routers when a high number of sparsely populated prefixes is advertised by the peers. The more contiguous the learned prefixes, the less memory is required by the prm_server_to or prm_server_ty process for storing the prefixes in the memory.   This failure will only be seen with very large scale, ie millions of routes.
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