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Cisco Bug: CSCun65949 - Provide carrier delay option to avoid traffic loss during line card OIR

Last Modified

May 12, 2018

Products (15)

  • Cisco Carrier Routing System
  • Cisco CRS-1 Line Card Chassis (Dual)
  • Cisco CRS-1 Line Card Chassis (Multi)
  • Cisco CRS-1 16-Slot Line Card Chassis
  • Cisco CRS-3 Multishelf System
  • Cisco IOS XR Software
  • Cisco CRS-1 4-Slot Single-Shelf System
  • Cisco CRS-3 8-Slot Single-Shelf System
  • Cisco CRS-3 16-Slot Single-Shelf System
  • Cisco CRS-1 8-Slot Line Card Chassis
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Known Affected Releases


Description (partial)

CRS-1 based line card OIR or reload

This is a rare event and but its possible if the following conditions are met:
1. Mix of CRS-3 line cards and CRS-1 line cards. The CRS-3 based line cards have faster CPUs and can be ready for forwarding much quicker as compared to a CRS-1 based line card following an OIR or reload event.
2. The router-under-test is learning the full BGP table for IP forwarding, therefore all of the BGP derived prefixes (several thousand) need to be programmed for hardware forwarding.
3. The ingress line card is CRS-3 based whereas the egress line card is CRS-1 based.
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Bug Details Include

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