The article explains the reasons for  directly connected interfaces not able to ping each other

• The directly  connected interfaces will not be able to ping each other.
• The two device can see each other lldp but can't ping
• No arp is learned on the directly connected interfaces  
• SFP is seen from the PFE level 
• Diagnostics  of optics for the affected interfaces does not have any values , all values and threshold are set to 0 .

TFXPC0(labroot vty)# show sfp 1 diagnostics   
 temperature           :  0.000 degrees C  ; raw 0000
 voltage             :  0.000 Volts    ; raw 0000
 tx power            :  0.000 mW     ; raw 0000
 rx power            :  0.000 mW     ; raw 0000
 bias current          :  0.000 mA     ; raw 0000

 Temp hi alarm thresh      :  0.000 degrees C  ; raw 0000
 Temp lo alarm thresh      :  0.000 degrees C  ; raw 0000
 Temp hi warning thresh     :  0.000 degrees C  ; raw 0000
 Temp lo warning thresh     :  0.000 degrees C  ; raw 0000

 Voltage hi alarm thresh     :  0.000 volt    ; raw 0000
 Voltage lo alarm thresh     :  0.000 volt    ; raw 0000
 Voltage hi warning thresh    :  0.000 volt    ; raw 0000
 Voltage lo warning thresh    :  0.000 volt    ; raw 0000

 Bias current hi alarm thresh  :  0.000 mA     ; raw 0000
 Bias current lo alarm thresh  :  0.000 mA     ; raw 0000
 Bias current hi warning thresh :  0.000 mA     ; raw 0000
 Bias current lo warning thresh :  0.000 mA     ; raw 0000

 tx power hi alarm thresh    :  0.000 mW     ; raw 0000
 Tx power lo alarm thresh    :  0.000 mW     ; raw 0000
 Tx power hi warning thresh   :  0.000 mW     ; raw 0000
 Tx power lo warning thresh   :  0.000 mW     ; raw 0000

 Rx power hi alarm thresh    :  0.000 mW     ; raw 0000
 Rx power lo alarm thresh    :  0.000 mW     ; raw 0000
 Rx power hi warning thresh   :  0.000 mW     ; raw 0000
 Rx power lo warning thresh   :  0.000 mW     ; raw 0000
TX Laser             : Enabled

TFXPC0(labroot vty)# show sfp list
SFP Toolkit summary:
 <<>>>
SFP periodic diagnostics polling count:   4

                                                      diag
Index  Name       Presence   ID Eprom PNO     SNO     calibr  Toxic

-----  --------------  ----------  -------- ---------- ----------- ------- -------

  <<<>>>>

  7  sfp-0/0/10(10)   Present  Complete NON-JNPR D45B0E1     int  Unknown

  8  sfp-0/0/12(12)   Present  Complete NON-JNPR N4550C8     int  Unknown

  9  sfp-0/0/13(13)   Present  Complete NON-JNPR E030573     int  Unknown

  10  sfp-0/0/14(14)   Present  Complete NON-JNPR N027BQA     int  Unknown <<<<<<<<< SFP is present 

  11  sfp-0/0/15(15)   Present  Complete NON-JNPR NB1E23CA     int  Unknown

• Remove and insert the optics and check if we are seeing transmit and receive  power on the affected interfaces 
• Replace the optics and check if we can see the the transmit and receive power are seen and check if we can ping the other end
• If replacing optics and changing cables doesn't  help, reboot  the device to clear the issue
• If issue is not resolved, reach out to JTAC for further troubleshooting