HW_RES_FAIL-4-LOW_CEF_MEM

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SLOT 2:Jun 20 00:55:46.777: %HW_RES_FAIL-4-LOW_CEF_MEM: SLOT 2 is running low on E2_Rx_TLU resources.  CEF will begin resource constrained forwarding operation if problem persists.  For additional details please see show ip cef resource and show ip cef summary


r1-rr#show ip cef resource
Hardware resource allocation status summary
Green (Normal), Yellow (Caution) Red (Alarm)
Slot HW Resource Name        Util     Alert
2    E2_Rx_PLU                51        G         
2    E2_Rx_TLU                90        Y         
4    E3 Rx PLU                49        G         
4    E3_Rx_TLU                8         G         

r1-rr#show ip cef summary
IP Distributed CEF with switching (Table Version 887076094), flags=0x0
  300756 routes, 0 reresolve, 0 unresolved (0 old, 0 new), peak 298708
  883050515 instant recursive resolutions, 608 used background process
  319 load sharing elements, 294405 references
  2368449 in-place/0 aborted modifications
  53969192 bytes allocated to the FIB table data structures
  universal per-destination load sharing algorithm, id 56B50836
  2(0) CEF resets
  Resolution Timer: Exponential (currently 1s, peak 4s)
  Tree summary:
   16-4-4-4-4 stride pattern
   short mask protection disabled
   300756 leaves, 112623 nodes using 17694728 bytes
  Transient memory used: 50408, max: 8766832
  Table epoch: 0 (300756 entries at this epoch)
Hardware resource allocation status summary
Green (Normal), Yellow (Caution) Red (Alarm)
Slot HW Resource Name        Util     Alert
2    E2_Rx_PLU                51        G         
2    E2_Rx_TLU                90        Y         
4    E3 Rx PLU                49        G         
4    E3_Rx_TLU                8         G  


%FORWARDING-FIB-4-RSRC_LOW CEF running low on [chars] resource memory. CEF will now begin resource constrained forwarding. Only route deletes will be handled in this state, which may result in mismatch between RIB/CEF. Traffic loss on certain prefixes can be expected. The CEF will automatically resume normal operation, once the resource utilization returns to normal level
Explanation    The fib_mgr process has detected that average utilization for specified resource has risen above a predefined high watermark value, and has enterred resource contrained forwarding mode. In this mode, the cef will only handle route deletes which may potentially freeup some memory. Due to this operational mode, the CEF/RIB will be out of sync. Once routes are deleted and resource utilization level drops to acceptable levels again, cef will come out of this operational mode and resume normal operation.
Recommended Action    Run show cef resource command and check which resource(s) are running low on memory. Any action that reduces number of routes for this protocol (results in route delete events to free up resources below predefined level) will eventually result in the cef returning to normal operation after few seconds



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