Collect Crash Data for the Packet Forwarding Engine Microkernel

Purpose

Each of the following Packet Forwarding Engine components of a Juniper Networks router runs a microkernel:

•         Flexible PIC Concentrator (FPC) on M-series platforms except for the M5 and M10 Internet routers
• Gibson Flexible PIC Concentrator (GFPC) on T640 and T320 Internet routing nodes
• Switched Printed Mezzanine Board (SPMB) on T640 and T320 Internet routing nodes
•         Forwarding Engine Board (FEB) on M5 and M10 Internet routers
•         System Switching Board (SSB) on an M20 Internet router
• System Control Board (SCB) on an M40 Internet router
•         Switching and Forwarding Module (SFM) on M160 and M40e Internet routers

When a crash occurs, crash stack traceback and registration information is placed into nonvolatile random access memory (NVRAM) on the different components. Table 60 shows where the NVRAM is located for the components for each router.

Table 60: NVRAM Location on the Microkernel of the Packet Forwarding Engine Components

Router Type	NVRAM Location
M5 and M10	FEB
M20	SSB and crash stack traceback and register information for the FPC
M40	SCB and crash stack traceback and register information for the FPC
M40e	FPC SFM
M160	FPC SFM
T320	GFPC SPMB
T640	GFPC SPMB

Steps To Take

To collect crash data for the Packet Forwarding Engine microkernel, follow these steps:

1. Display the Crash Stack Traceback and Registration Information
2. Clear the NVRAM Contents
3. Check Packet Forwarding Engine Microkernel Core Files
4. Collect and Send Crash Data to JTAC