Issue description:
On the interface of switch, we find have the discard packets, it is like below.
<HUAWEI> display interface gigabitethernet 0/0/1
GigabitEthernet 0/0/1 current state : UP       
Line protocol current state : UP     
Description:                         
Switch Port,Link-type : access(negotiated),  PVID :    1, TPID : 8100(Hex), The Maximum Frame Length is 9216   
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 0025-9ef4-abcd
Current system time: 2012-06-05 18:56     
Port Mode: COMMON FIBER, Transceiver: 1000_BASE_SX_SFP    
Speed : 1000,   Loopback: NONE                
Duplex: FULL,   Negotiation: ENABLE        
Mdi   : -, Flow-control: DISABLE         
Last 300 seconds input rate 9707408 bits/sec, 13678 packets/sec                          
Last 300 seconds output rate 326788584 bits/sec, 32824 packets/sec                          
                                                                                                          
Input:  37059350917 packets, 3285287717246 bytes                                                     
  Unicast:                          37056668221,  Multicast:                           56216  
  Broadcast:                        2626480,  Jumbo:                               0 
  Discard:                          0,  Pause:                               0 
  Frames:                           0   
 
  Total Error:                      0
  CRC:                              0,  Giants:                              0 
  Jabbers:                          0,  Fragments:                           0 
  Runts:                            0,  DropEvents:                          0 
  Alignments:                       0,  Symbols:                             0 
  Ignoreds:                         0
                                                                               
Output:  74176982789 packets, 90378130553106 bytes                                                    
  Unicast:                         74170825249 ,  Multicast:                           1592999  
  Broadcast:                        4564541,  Jumbo:                               0 
  Discard:                          5079924,  Pause:                               0 
 
  Total Error:                      0                                          
  Collisions:                       0,  ExcessiveCollisions:                 0 
  Late Collisions:                  0,  Deferreds:                           0 
  Buffers Purged:                   0               
                                                                               
    Input bandwidth utilization threshold : 80.00%                            
    Output bandwidth utilization threshold: 80.00%                            
    Input bandwidth utilization  :    0.97%                                       
    Output bandwidth utilization :    32.68%
 
Issue analysis:
We can use the command: reset counters interface gigabitethernet 0/0/1
<HUAWEI> reset counters interface gigabitethernet 0/0/1
And then check the interface counters again, if we observe the counter of discard packets is growing, We can basically judge that it is due to insufficient bandwidth or burst traffic in the network.
Solution description:
We need to expand the bandwidth.
We can create eth-trunk interface bind two or more physical interfaces. This post was last edited by l00188222 at 2012-06-05 18:56.