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NE40E and Cisco ATM connection PING packet loss

Publication Date:  2012-07-27 Views:  62 Downloads:  1
Issue Description
In the Customer network 0.2% of PING packets loss when PING between NE40E a Cisco router via Cisco ATM Switch (IGX). check the attachment for more information.
Alarm Information
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Handling Process
There is no any problem with normal ping between cisco router and Huawei NE40E the only problem happened when ping big size packet from cisco router to huawei NE40E one direction problem . the reason for that is because Cisco router ping speed is very fast (1ms) which generate high bandwidth more than 8Mbps. NE40E CPU has protoction policy (CP-CAR) which limite the bandwidth for PING packet to 4M to avoid PING attack . so when the PING packet exceed the limiteation the CPU will drop it .
[SANC-NE40E-01]cpu-defend policy 10
[SANC-NE40E-01-cpu-defend-policy-10]di th                                                                                           
#                                                                                                                                   
cpu-defend policy 10                                                                                                                
#                                                                                                                                   
return
[SANC-NE40E-01-cpu-defend-policy-10]car icmp cir 9000
[SANC-NE40E-01-cpu-defend-policy-10]quit
[SANC-NE40E-01]slot 2
[SANC-NE40E-01-slot-2]cp
[SANC-NE40E-01-slot-2]cpu-defend-policy 10
[SANC-NE40E-01-slot-2]quit
[SANC-NE40E-01]display  cpu-defend car  icmp statistics  slot  2                                                                    
 Slot               : 2                                    
                                                                         
 Application switch : Open                                        
                                                                  
 Default Action     : Min-to-cp                                        
                                                             
--------------------------------------------                                                                                        
 ICMP packet                                  
                                                                                      
 Protocol switch: Open                    
                                                                                          
 Packet information:     
                                                                                                           
  Passed packet(s)  : 421311                                  
                                                                      
  Dropped packet(s) : 300                                        
                                                                   
 Configuration information:          
                                                                                               
  Configged CIR : 9000    kbps       Actual CIR in NP : 9000    kbps                                                                
  Configged CBS : 40000   bytes      Actual CBS in NP : 40000  bytes                                                   
  Priority : middle        
    Min-packet-length : 128bytes
[SANC-NE40E-01]
Root Cause
 we did the following operation to analysis the problem in the site where the customer bandwdith is 10M the PING packet still has packet loss when PING packet size 1000 :
a.Add optical power attenuator.
b.Change the ATM subcard. 
c.CPU-CAR for protection propose drop bandwidth exceeded PING packets .check the attachment for more details.
Suggestions
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END