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Cisco Bug: CSCta84988 - CRS1 multiple planes MCAST DOWN after router reload

Last Modified

May 12, 2018

Products (11)

  • Cisco Carrier Routing System
  • Cisco CRS-1 Line Card Chassis (Dual)
  • Cisco CRS-1 16-Slot Line Card Chassis
  • Cisco CRS-1 Line Card Chassis (Multi)
  • 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 3.8.2.BASE 3.8.3.BASE 3.9.0.BASE

Description (partial)

Symptom:
 
 CRS1 systems may not reload successfully due to fabric planes remaining in MCAST DOWN
 state until manually recovered.
 
 Description: 
 
 Occasionally on CRS-1 Multi-chassis systems with greater than 2 active planes the system may come 
 up with one or more fabric planes in the MCAST DOWN state following a system reload. The fabric 
 plane state is found by issuing the admin show controllers fabric plane all command as shown in the 
 example below. Should all odd or all even planes be MCAST DOWN, the system will not come up and 
 will eventually reload. 
 
 Example of fabric plane states in a failed condition:
 
 RP/0/RP0/CPU0:router# admin
 RP/0/RP0/CPU0:router(admin)# show controllers fabric plane all
 
 Plane  Admin   Oper   up->dn        Down    Total     Down
 Id     State   State  counter       Flags   Bundles   Bundles
  ------------------------------------------------------------
  0     UP     MCAST_DOWN 0          m          27        18
  1     UP     UP         0                     27        15
  2     UP     MCAST_DOWN 0          m          27        18
  3     UP     UP         0                     27        15
  4     UP     UP         0                     27        15
  5     UP     UP         0                     27        15
  6     UP     UP         0                     27        15
  7     UP     UP         0                     27        15
 
  
 Conditions:
  
 May occur after system reload
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