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Cisco Bug: CSCvt01199 - The cef output chain become unresolved when BGP peer flapping occurs.

Last Modified

Aug 29, 2020

Products (11)

  • Cisco IOS
  • Cisco Catalyst 9800-40 Wireless Controller
  • Cisco Catalyst 9800-L-C Wireless Controller
  • Cisco Embedded Wireless Controller on Catalyst 9120AX Access Points
  • Cisco Embedded Wireless Controller on Catalyst 9115AX Access Points
  • Cisco Embedded Wireless Controller on Catalyst 9117AX Access Points
  • Cisco Catalyst 9800-80 Wireless Controller
  • Cisco Cloud Services Router 1000V
  • Cisco Catalyst 9800-L-F Wireless Controller
  • Cisco Catalyst 9800-CL Wireless Controller for Cloud
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Known Affected Releases

16.12.2s 16.9.3 16.9.4 17.1.1

Description (partial)

Symptom:
The cef output chain becomes unresolved when BGP flapping occurs and it causes packet forwarding failure.
This unresolved status can be confirmed 'show ip cef internal' command.

Conditions:
This issue can be seen under the following conditions.

1. Both BGP and LISP have the same route.
2. Using MPLS.
3. When BGP peer flaps.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
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