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Cisco Bug: CSCtb00155 - V2 GE SPA sends frame with corrupted MAC header

Last Modified

May 16, 2018

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 CRS-1 4-Slot Single-Shelf System
  • Cisco IOS XR Software
  • Cisco CRS-1 8-Slot Line Card Chassis
  • Cisco CRS-1 Fabric Card Chassis
  • Cisco CRS-1 8-Slot Single-Shelf System
  • Cisco CRS-1 16-Slot Single-Shelf System
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Known Affected Releases

3.6.1.LC

Description (partial)

Symptom:
    
  Under very specific circumstances, GE SPA (5x1GE, 8x1GE, 10x1GE) may get
 latched into a state where it corrupts all egress traffic. Ingress traffic is
 not impacted. Packets transmitted have a corrupted MAC header. The frame is
 prepended with 16 bytes from a previous frame. Due to the corrupted MAC header,
 the next hop will  drop the frame because it's not its destination MAC address
 or because  it's an unknown layer 2 ethertype when the frame is processed
 because it has a multicast MAC address (the destination MAC address is random
 as this depends on the pattern in the previous frame).
 
 Please contact your technical representative for more details of the specific
 scenarios.
    
    Conditions:
    
   Following a very short loss-of-signal period, with signal restoration within
   less than 10msec, this issue can occasionally be observed. As this is SPA
 dependant, both CRS-1 & C12K platforms are impacted.
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Bug Details Include

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