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Cisco Bug: CSCus57583 - ASR 1K BGP Process Crash Due to EIGRP Route Redistribution

Last Modified

Dec 06, 2018

Products (25)

  • Cisco IOS
  • Cisco ASR 901-6CZ-FS-D Router
  • 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-AH Router
  • Cisco ASR 901-6CZ-F-A Router
  • Cisco ASR 901S-2SG-F-D Router
  • Cisco ASR 901-6CZ-FT-A Router
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Known Affected Releases


Description (partial)

An ASR 1K with EIGRP route redistribution into BGP may see a crash in the "BGP" process during periods of network instability (100's of peer flaps per minute.)

%DUAL-5-NBRCHANGE: EIGRP-IPv4 X: Neighbor X.X.X.X (TunnelX) is down: holding time expired
%DUAL-5-NBRCHANGE: EIGRP-IPv4 X: Neighbor X.X.X.X (TunnelX) is down: holding time expired
%DUAL-5-NBRCHANGE: EIGRP-IPv4 X: Neighbor X.X.X.X (TunnelX) is down: holding time expired

Exception to IOS Thread:

UNIX-EXT-SIGNAL: Segmentation fault(11), Process = BGP Router
-Traceback= 1#XXXXXXXX...

This defect affects IOS-XE platforms specifically including the ASR 1K series of routers. When redistributing EIGRP routes into BGP, BGP will directly access information from EIGRP routing database to obtain route attributes. However, under certain conditions while the BGP process is running, an EIGRP structure may be modified leading to BGP attempting to access invalid attribute data. As a consequence, a crash may be seen due to a timing issue in code. This issue is more prevalent during heightened periods of EIGRP instability when internal changes are actively occurring.
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