Sfm Components - Juniper M40E Hardware Manual

M40e Multiservice Edge Router Hardware Guide

SFM Components

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Transfer of outgoing data packets—The second Distributed Buffer Manager ASIC
passes notification of the forwarding decision for each packet to an I/O Manager ASIC
so that data cells for the outgoing packet can be reassembled for transmission to the
network.
Transfer of exception and control packets—The Internet Processor II ASIC passes
exception packets to the microprocessor on the SFM, which processes almost all of
them. The SFM sends any remaining exception packets to the Routing Engine for further
processing. When the SFM detects an error originating in the Packet Forwarding Engine,
it sends it to the Routing Engine using system logging (syslog) messages.
Each SFM is a two-board system, as shown in Figure 11 on page 20. 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
labeled . "M40e SFM LEDs" on page 23 describes the LED states.
FAIL
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
M40e SFM LEDs on page 23
Replacing an SFM in an M40e Router on page 206.
M40e Chassis Description on page 8
and an yellow one
OK
command.
show chassis sfm detail
Copyright © 2010, Juniper Networks, Inc.