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Cisco Bug: CSCul24345 - ASR901: VCC WP flow creation fails with flow already exists Tracebacks

Last Modified

Jan 31, 2017

Products (16)

  • Cisco ASR 901 Series Aggregation Services Routers
  • Cisco ASR 901-6CZ-F-D Router
  • Cisco ME 3600X-24TS-M Switch
  • Cisco ASR 901-4C-FT-D Router
  • Cisco ASR 901S-4SG-F-D Router
  • Cisco ASR 901S-2SG-F-D Router
  • Cisco ASR 901-6CZ-F-A Router
  • Cisco ASR 901-6CZ-FT-A Router
  • Cisco ASR 901-12C-FT-D Router
  • Cisco ME 3600X-24FS-M Switch
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Known Affected Releases

15.4(1)S

Description (partial)

Symptom:
On an ASR901 router, IMA pseudowire traffic may fail with many Winpath errors and Tracebacks getting dumped as given below :
Nov  6 01:07:46.454 PST: Error Traceback:
	File = ../sources/iw/classifier/wpi_iw_dfc.c
	Function=WPI_IwSystemCreateEmc
	Line = 1499
	error_index=574 [WP_INVALID_IW_EMC_FLOW_EXISTS_IN_HASH]

Nov  6 01:07:46.454 PST: -Traceback= 26ACAC4z 5C514ECz 5D390B4z 5DC5854z 5D8B924z 5DEEDA0z 5CED1A4z 5CDB44Cz 5C35C3Cz 5C3FA24z 5C3FEF8z 6087920z 3E546F0z 6D6172Cz 6D617D8z 3E531D8z
 
Nov  6 01:07:46.454 PST: Error Traceback:
	File = ../sources/iw/core/wpi_iw_flow.c
	Function=WP_IwFlowDelete
	Line = 523
	error_index=126 [WP_ERR_IW_FLOW_UNINITIALIZED]

Nov  6 01:07:46.454 PST: -Traceback= 26ACAC4z 5C514ECz 5D390B4z 5DABD20z 5CE8F84z 5CEA9C0z 5CEE2F4z 5CDB5ACz 5C35C3Cz 5C3FA24z 5C3FEF8z 6087920z 3E546F0z 6D6172Cz 6D617D8z 3E531D8z
 
Nov  6 01:08:04.894 PST: Error Traceback:
	File = ../sources/iw/core/wpi_iw_rx_binding.c
	Function=WP_IwRxBindingCreate
	Line = 576
	error_index=17 [WP_ERR_HANDLE]

Nov  6 01:08:04.894 PST: -Traceback= 26ACAC4z 5C514ECz 5D390B4z 5DEB664z 5CEC6CCz 5CDB3D0z 5C35C3Cz 5C3FA24z 5C3FEF8z 6087920z 3E546F0z 6D6172Cz 6D617D8z 3E531D8z 3E53E04z 3E4A34Cz

Conditions:
IMA VCC pseudowire redundancy and MPLS TE FRR are configured and with the backup L3 path unavailable "clear ip route *" is executed multiple times on the head-end router and the next-hop router.
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