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. |
