An Interface Does Not Go Up

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An Interface Does Not Go Up

Common Causes

This fault is commonly caused by the following:

l   The interface is in Error-Down state.

l   The transmission medium is problematic.

l   The configuration is incorrect.

Troubleshooting Procedure

If an interface does not go Up, perform the following steps to locate the fault (save operation records):

Step 1 Check whether the interface is in Error-Down state.

<HUAWEI> display interface 10ge 1/0/1                                          
10GE1/0/1 current state : ERROR DOWN(link-flap) (ifindex: 5)                        
Line protocol current state : DOWN 
……

l   If the interface is in Error-Down state, rectify the fault according to:

           Enterprise network technical support website: CloudEngine Series Switches Error-Down Mechanism.

           Carrier network technical support website: CloudEngine Series Switches Error-Down Mechanism.

l   If the interface is not in Error-Down state, go to step 2.

Step 2 Check whether optical module information is correct.

<HUAWEI> display interface 10ge 1/0/3 transceiver verbose 
                                                                                
 10GE1/0/3 transceiver information:                                             
-------------------------------------------------------------------             
 Common information:                                                            
   Transceiver Type                    :10GBASE_SR                            
   Connector Type                        :LC                                    
   Wavelength (nm)                       :850                                   
   Transfer Distance (m)              :30(62.5um/125um OM1)                  
                                          80(50um/125um OM2)                    
                                          300(50um/125um OM3)                   
                                          400(50um/125um OM4)                   
……
-------------------------------------------------------------------             
 Alarm information:                                                             
    LOS Alarm                                                                   
-------------------------------------------------------------------             
 Diagnostic information:                                                        
   Temperature (Celsius)                 :34.68                                 
   Voltage (V)                           :3.36                                  
   Bias Current (mA)                     :7.03                                  
   Bias High Threshold (mA)              :10.00                                 
   Bias Low Threshold (mA)               :2.60                                   
   Current RX Power (dBm)                :-50.00                                
   Default RX Power High Threshold (dBm) :1.50                                  
   Default RX Power Low Threshold (dBm)  :-14.00                                 
   Current TX Power (dBm)                :-2.22                                 
   Default TX Power High Threshold (dBm) :-1.00                                 
   Default TX Power Low Threshold (dBm)  :-8.00                                  
-------------------------------------------------------------------

l   View the Transceiver Type field to check whether the local optical module type matches the remote optical module type. For example, if a GE optical module is installed on the remote interface and a 10GE optical module is installed on the local interface, the interfaces do not go Up. You can replace the optical module on the local or remote interface based on actual requirements so that the local and remote optical modules have the same rate.

l   View the Transfer Distance field to check the transmission distance of the optical module, and determine whether the optical fiber length is within the allowed transmission distance range of the optical module based on the optical fiber type. In the preceding command output, the transmission distance supported by OM1 optical fibers is 30 m. If the actual transmission distance exceeds 30 m, use an optical fiber with a longer transmission distance.

l   View the Current TX Power and Current RX Power fields under Diagnostic information to check whether the transmit and receive optical power of the optical module are normal.

For example, if the value of the Current RX Power field is between values of the Default RX Power High Threshold (dBm) and Default RX Power Low Threshold (dBm) fields, the receive optical power is normal. Otherwise, the receive optical power is abnormal. Check whether the remote optical module is normal or connects to an optical fiber correctly. Similarly, if the value of Current TX Power exceeds the allowed range, the transmit optical power is abnormal. Check whether the local optical module is normal or connects to an optical fiber correctly.

l   Check the Alarm information field to determine whether the optical module is certified for Huawei Ethernet switches. If the alarm message "Non-Huawei-Certified Transceiver" or "Non-Huawei-Ethernet-Switch-Certified Transceiver" is displayed, the optical module is not certified for Huawei Ethernet switches. Replace it with one that is certified for Huawei Ethernet switches.

If values of the preceding fields are normal, go to step 3.

Step 3 Check whether the configurations of the local and remote interfaces are different.

<HUAWEI> system-view
[~HUAWEI] interface 10ge 1/0/1
[~HUAWEI-10GE1/0/1] display this
#                                                                                                                                   
interface 10GE1/0/1                                                                                                                    
 device transceiver 1000BASE-X                                                                                                      
 negotiation disable                                                                                                                 
#                                                                                                                                   
Return
[~HUAWEI-10GE1/0/1] display this interface
10GE1/0/1 current state : DOWN (ifindex: 3109)                                  
Line protocol current state : DOWN                                              
Description:                                                                    
Switch Port, PVID :    1, TPID : 8100(Hex), The Maximum Frame Length is 9216    
Internet protocol processing : disabled                                         
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 0019-7459-3301 
Port Mode:    COMMON COPPER,     Port Split/Aggregate:         DISABLE 
Speed:                 AUTO,     Loopback:                        NONE          
Duplex:                FULL,     Negotiation:                  DISABLE          
Input Flow-control: DISABLE,     Output Flow-control:          DISABLE          
……

l   View the display this command output to check whether the configuration of the local interface is the same as that of the remote interface, for example, check whether the interface is shut down or configured with the training function.

l   View the Negotiation, Speed, and Duplex fields in the display this interface command output to check whether the auto-negotiation mode, rate, and duplex mode of the local and remote interfaces match.

If the configurations are different, modify the configurations so that the local and remote interfaces have the same auto-negotiation mode, rate, and duplex mode. If the configurations are the same, go to step 4.

Step 4 Collect the following information and contact technical support personnel:

l   Results of the preceding troubleshooting procedure

l   Configuration file, logs, and alarms of the device

Relevant Alarms and Logs

Relevant Alarms

DEVM_1.3.6.1.4.1.2011.5.25.219.2.4.5 hwOpticalInvalid

If the preceding alarm is displayed, collect information about optical modules on the local and remote interfaces and configurations of the interfaces, and contact technical support personnel.

Relevant Logs

DEVM/4/hwOpticalInvalid

You can also find the answer in Typical Fault Troubleshooting Guide in Maintenance and Troubleshooting.

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