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IP CEF error on a slot

Posted on 2007-03-28
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Last Modified: 2011-09-20
I get the following error on my GSR router on slot 2.  I have enclosed the outpu of the relevent commands.


SLOT 2:Mar 28 09:46:06.378: %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

Cairo#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                32        G        

2    E2_Rx_TLU                75        Y        

4    E3 Rx PLU                25        G        

4    E3_Rx_TLU                28        G        

5    E3 Rx PLU                25        G        

5    E3_Rx_TLU                27        G        

6    E3 Rx PLU                25        G        

6    E3_Rx_TLU                28        G        

9    E3 Rx PLU                25        G        

9    E3_Rx_TLU                28        G        

11   E3 Rx PLU                25        G        

11   E3_Rx_TLU                28        G        

Cairo#show ip cef summary

IP Distributed CEF with switching (Table Version 136151876), flags=0x0

  229026 routes, 0 reresolve, 0 unresolved (0 old, 0 new), peak 215320

  134440412 instant recursive resolutions, 2 used background process

  13028 load sharing elements, 228960 references

  1410603 in-place/0 aborted modifications

  55345620 bytes allocated to the FIB table data structures

  universal per-destination load sharing algorithm, id 917EF70F

  2(0) CEF resets

  Resolution Timer: Exponential (currently 1s, peak 4s)

  Tree summary:

   8-8-8-8 stride pattern

   short mask protection disabled

   229026 leaves, 14159 nodes using 21139632 bytes

  Transient memory used: 2760, max: 6430952

  Table epoch: 0 (229026 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                32        G        

2    E2_Rx_TLU                75        Y        

4    E3 Rx PLU                25        G        

4    E3_Rx_TLU                28        G        

5    E3 Rx PLU                25        G        

5    E3_Rx_TLU                27        G        

6    E3 Rx PLU                25        G        

6    E3_Rx_TLU                28        G        

9    E3 Rx PLU                25        G        

9    E3_Rx_TLU                28        G        

11   E3 Rx PLU                25        G        

11   E3_Rx_TLU                28        G    
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Question by:mayambanzumba
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jaredcall earned 500 total points
ID: 18821771
http://www.cisco.com/en/US/products/ps5845/products_system_message_guide_chapter09186a00806a2b7b.html lists a similar error:

<paste>Error Message    

%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. </paste>

I hope this helps.
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