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Cisco Bug: CSCtc87059 - Netio drops ICMP type 3 code 4 message under certain condition

Last Modified

Jan 10, 2017

Products (11)

  • 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 IOS XR Software
  • Cisco CRS-1 4-Slot Single-Shelf System
  • Cisco CRS-1 Fabric Card Chassis
  • Cisco CRS-1 8-Slot Line Card Chassis
  • Cisco CRS-1 8-Slot Single-Shelf System
  • Cisco CRS-1 Multishelf System
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Known Affected Releases

3.8.1.BASE

Description (partial)

Symptom:
 Netio drops ICMP type 3 code 4 message due to internal logic error.
 Due to this, Path MTU discovery does not work correctly for TCP session 
transiting over the router.
 That may lead to a stuck TCP session or BGP continuous flap problem.
 
 Condition:
 Problem happens when egress interface has LDP neighbor 
 The problem is specific to the CRS-1 platform running 3.8 code.
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Bug Details Include

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