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Cisco Bug: CSCvv17560 - BMP BGP server can lead to CPUHOG and crashes

Last Modified

Oct 04, 2020

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases

17.2.1

Description (partial)

Symptom:
Crash preceded by notifications such as:

BGP-3-BMP_MEMORY: BMP Memory Utilization currently at X, exceeds threshold Y

SYS-3-CPUHOG: Task is running for (Z)msecs, more than (2000)msecs (5/5),process = iosp_vty_100001_dmi_syncfd_fd_172.
memcmp, mdlist_insert_sorted, bgp_bmp_init_bgp_neighbor, bgp_bmp_neighbor_monitoring_activate, bgp_session_parse, bgp_neighbor_parse, bgp_neighbor, neighbor_command, parse_cmd_internal, parse_cmd, ios_portal_vty_run_cmd, iosp_vty_proc

where X and Y correspond to utilization and threshold in bytes, and Z is the number of milliseconds.

Conditions:
Slow response by BMP server. BGP BMP message transmission is getting backlogged due to TCP not able to transmit at the rate BGP BMP messages are generated. A typical example is a case of high BMP memory utilization and another BGP BMP neighbor being configured while the router is in this state.
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