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• M40e SFM Components and LEDs    

• Related Topics
• M40e Switching and Forwarding Module (SFM) Description
• Installing an SFM in an M40e Router
• M40e Chassis Description

M40e SFM Components and LEDs

Each SFM is a two-board system, as shown in Figure 1. It has the components:

• Two Distributed Buffer Manager ASICs—Process incoming and outgoing packets: one distributes data cells (which the I/O Manager ASIC on each FPC derives from incoming packets) to the shared memory buffers on the FPCs, while the second forwards notification of routing decisions to the I/O Manager ASICs.
• One Internet Processor II ASIC—Performs route lookups and makes routing decisions.
• Parity-protected SSRAM—Stores the forwarding table.
• Processor subsystem—Manages SFM functions and handles exception packets. The processor has the components:
  • One PowerPC 603e processor
  • Parity-protected Level 2 cache
  • Parity-protected DRAM
• EEPROM—Stores the serial number and revision level.
• Offline button—Prepares the SFM for removal from the router when pressed.
• Two LEDs—Indicate SFM status. There is a green one labeled OK and an yellow one labeled FAIL. Table 1 describes the LED states.
• Ejector handles and locking tabs—Control the locking system that secures the SFM in the chassis.

Note: For specific information about SFM components (for example, the amount of SSRAM and DRAM), issue the show chassis sfm detail command.

Figure 1: M40e Switching and Forwarding Module

Table 1: States for M40e SFM LEDs

Label	Color	State	Description
OK	Green	On steadily	SFM is functioning normally.
		Blinking	SFM is starting up.
FAIL	Yellow	On steadily	SFM has failed.