Troubleshooting the TX Matrix TX-SIBs and the Switching Planes

Problem

• The red FAIL LED below a TX-SIB on the craft interface is lit.
• TX or RX LED next to a fiber-optic array adapter is lit red
• The RX LED next to a fiber-optic array adapter is lit yellow.

Solution

To troubleshoot the switching plane connections between the TX-SIBs in the TX Matrix router and the T640-SIBs in the T640 routers:

1. Verify that the TX-SIBs and T640-SIBs are online by issuing the show chassis sibs command:
   user@host> show chassis sibs

   scc-re0:
   --------------------------------------------------------------------------
   Slot  State               Uptime
    0    Spare            133 days, 12 minutes, 41 seconds
    1    Online           133 days, 12 minutes, 41 seconds
    2    Online           133 days, 12 minutes, 41 seconds
    3    Online           133 days, 12 minutes, 41 seconds
    4    Online           133 days, 12 minutes, 41 seconds
   
   lcc0-re0:
   --------------------------------------------------------------------------
   Slot  State               Uptime
    0    Spare            133 days, 12 minutes, 2 seconds
    1    Online           133 days, 12 minutes, 2 seconds
    2    Online           133 days, 12 minutes, 2 seconds
    3    Online           133 days, 12 minutes, 2 seconds
    4    Online           133 days, 12 minutes, 2 seconds

2. Verify the state of the electrical and optical switch fabric links by issuing the show chassis fabric sibs command:
   user@host> show chassis fabric sibs

   scc-re0:
   --------------------------------------------------------------------------
   Fabric management SIB state:
   SIB #0
       plane state: S_SPARE                    
       LCC #0      : Links ok            
   SIB #1
       plane state: S_ACTIVE                    
       LCC #0      : Links ok            
   SIB #2
       plane state: S_ACTIVE                    
       LCC #0      : Links ok            
   SIB #3
       plane state: S_ACTIVE                    
       LCC #0      : Links ok
   SIB #4
       plane state: S_ACTIVE                    
       LCC #0      : Links ok                
   
   lcc0-re0:
   --------------------------------------------------------------------------
   Fabric management SIB state:
   SIB #0
       plane state: S_SPARE                     
       FPC #0
           PFE #0  : Links ok            
           PFE #1  : Links ok            
       SCC         : Links ok            
   SIB #1              
       plane state: S_ACTIVE                    
       FPC #0
           PFE #0  : Links ok            
           PFE #1  : Links ok            
       SCC         : Links ok            
   SIB #2
       plane state: S_ACTIVE                    
       FPC #0
           PFE #0  : Links ok            
           PFE #1  : Links ok            
       SCC         : Links ok            
   SIB #3
       plane state: S_ACTIVE                    
       FPC #0
           PFE #0  : Links ok            
           PFE #1  : Links ok            
       SCC         : Links ok            
   SIB #4
       plane state: S_ACTIVE                    
       FPC #0
           PFE #0  : Links ok            
           PFE #1  : Links ok            
       SCC         : Links ok

   Verify that the state of each link is Links ok.

3. Display the system log messages to obtain information about link failures. The /var/log/messages file is a commonly configured destination for system log messages. To display it, issue the show log messages command:
   user@host> show log messages

   For more information about system log messages, see the Junos OS System Log Messages Reference .

   Your customer support representative can assist you with using the information in the system log, along with the supplied fiber-optic array loopback connector and adapter, to determine if you have a faulty TX-SIB, T640-SIB, or fiber-optic array cable.

   Caution: Do not connect and disconnect a fiber-optic array cable connector, a loopback connector, or a loopback adapter more frequently than required to perform the procedures in this hardware guide. These fiber-optic components are rated for a limited number of insertions (approximately 100).

4. If the red FAIL LED below a TX-SIB on the craft interface is on, look at the display on the craft interface to check the status of the TX-SIB.
5. If an RX LED next to a fiber-optic array adapter is lit yellow, the fiber-optic array cable plugged into the adapter might be connected to the wrong T640-SIB. Check that the fiber-optic array cable is connected as specified in Fiber-Optic Array Cable Connections between TX-SIBs and T640-SIBs.
6. If a TX or RX LED next to a fiber-optic array adapter is lit red, look at the display on the craft interface to check the status of the TX-SIB. If an RX LED is lit red, the corresponding receive link either has detected errors or is not functioning normally.
7. Make sure the TX-SIB is properly seated in the midplane. Check that each ejector handle has been turned clockwise and is tight.