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Cisco Bug: CSCuq07432 - Ingress SPAN and ABF pointing to egress BVI can cause NP lockup

Last Modified

Sep 12, 2019

Products (7)

  • Cisco ASR 9000 Series Aggregation Services Routers
  • Cisco ASR 9922 Router
  • Cisco IOS XR Software
  • Cisco ASR 9010 Router
  • Cisco ASR 9006 Router
  • Cisco ASR 9001 Router
  • Cisco ASR 9912 Router

Known Affected Releases

4.3.4.BASE 4.3.4.LC

Description (partial)

Symptom:
Possible to see NP lockup reported and causing NP fast reset on Typhoon based linecards.  
Example:

LC/0/3/CPU0:Jun 18 00:15:50.257 GMT: pfm_node_lc[287]: %PLATFORM-NP-2-NP_DIAG : Set|prm_server_ty[176210]|Network Processor Unit(0x1008002)| NP diagnostics warning on NP2.
LC/0/3/CPU0:Jun 18 00:16:06.910 GMT: prm_server_ty[297]: %PLATFORM-NP-4-FAULT : Fast Reset NP2 - successful auto-recovery of NP
LC/0/3/CPU0:Jun 18 00:16:06.910 GMT: pfm_node_lc[287]: %PLATFORM-NP-2-NP_DIAG : Clear|prm_server_ty[176210]|Network Processor Unit(0x1008002)| NP diagnostics warning on NP2.

Conditions:
This has been seen with SPAN on ingress direction with ABF configured where the nexthop interface is a BVI.  Sending packets at or near the MTU of the BVI can cause the lockup.

In the NPdatalog written you will see RSV_PUNT_IP_MTU_EXCEEDED.
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