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MX SCB Troubleshooting Subroutine (called from Resolution Guide - Troubleshoot Fabric Plane)

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Article ID: KB23068 KB Last Updated: 19 Dec 2012Version: 5.0
Summary:

This article provides the steps to be taken on the MX SCB when troubleshooting Fabric Issues. 

This series of steps is a subroutine that is called from the KB23173 - Resolution Guide - Troubleshoot Fabric Plane.



Symptoms:

Cause:
 
Solution:

Perform the following steps for MX SCB Troubleshooting:

Note: For the flowchart version of these steps, click the flowchart icon:
[Collect logs]

Step 1.   As a proactive step, collect logs on the MX, in case they are needed later for diagnosing a problem. The logs to collect are in the KB22637 - [M, MX, T Routers] Data Collection Checklist under the 'MX Fabric Plane' section..



[Identify Plane(s) with error]

Step 2. Identify the planes with errors by running the following commands:

show chassis fabric planes   
show chassis fabric fpcs

Note: If you already identified the faulty planes in the KB23173 - Resolution Guide - Troubleshoot Fabric Plane, then you can continue to Step 3.

 Example output:
user@router> show chassis fabric fpcs
Jan 17 17:42:24
Fabric management FPC state
FPC 0
PFE #0
Plane 0: Link error
Plane 1: Plane enabled
Plane 2: Plane enabled
Plane 3: Plane enabled
Plane 4: Plane enabled
Plane 5: Plane enabled

user@router> show chassis fabric plane
Fabric management PLANE state
Plane 0
Plane state: ACTIVE
FPC 0
PFE 0 :Links ok
PFE 1 :Links ok
FPC 1
PFE 0 :Links ok
PFE 1 :Link error
PFE 2 :Links ok
PFE 3 :Links ok
In the above example, Plane 0 is reporting an error on FPC1 (PFE1) (which is a type2 MPC card). Example outputs of single Plane reporting errors and multiple Planes reporting errors are shown in KB23382 - Example outputs for DPC/MPC reporting errors.

Note: The number of PFEs under each FPC will vary according to the card type present in that slot. MPC type1 cards have one PFE. MPC type2 cards have 2 PFEs. MPC 16x10GE and DPC have 4 PFEs.




[Offline / Online the Plane with error]

Step 3. Offline and then Online the Planes with errors (identified in step 2).  

CAUTION: In a mixed MPC and DPC card environment, since all the planes are in the active state, if any plane is offlined it will result in degradation in available fabric bandwidth. Hence it is strongly recommended to perform this step in a maintenance window.

TIP:  
Refer to
KB23067 - Offline/Online Routine for MX Fabric Plane and MX SCB for guidelines on how to offline/online planes.


Then observe the outputs of 'show chassis alarms' and 'show chassis fabric fpcs'.

Is the link error reported in step 2 corrected, and are the alarms cleared (after performing the Offline/Online of the plane)?

  •   No - Continue to Step 4

  •   Yes - If this is the first occurrence of any Fabric or SCB related link errors on this Fabric Plane, then monitor the SCB for a period of time.. If the errors reappear or if this has happened before on this Fabric Plane, then open a case with your technical support representative.



[Offline / Online the SCB with error]            

Step 4. Now Offline and then Online the SCB, associated with the plane with errors.

CAUTION: In a mixed MPC and DPC card environment, since all the planes are in the active state, if any plane is offlined it will result in degradation in available fabric bandwidth. Hence it is strongly recommended to perform this step in a maintenance window.

TIP:
 Refer to
KB23067 - Offline/Online Routine for MX Fabric Plane and MX SCB for guidelines on how to offline/online SCBs.


Then observe the outputs of 'show chassis alarms' and 'show chassis fabric fpcs'.

Is the link error reported in step 2 corrected, and are the alarms cleared (after performing the Offline/Online of the SCB)?

  •   No - Continue to Step 5

  •   Yes - If this is the first occurrence of any Fabric or SCB related link errors on this Fabric Plane, then monitor the Fabric Plane for a period of time. If the errors reappear or if this has happened before on this Fabric Plane, then collect the information in the KB22637 - [M, MX, T Routers] Data Collection Checklist under the 'MX Fabric Plane' section, and open a case with your technical support representative..



[Reseat the SCB]

Step 5.  Now physically reseat the SCB.
 
 
For guidelines, refer to the following:         

Then observe the outputs of 'show chassis alarms' and 'show chassis fabric fpcs'.    


Is the link error reported in step 2 corrected, and are the alarms cleared (after reseating the SCB)?





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