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Redundant CFEBs on the M10i Router
On the M10i router, the CFEB performs the following functions:
- Route lookups—Performs route lookups using the forwarding
table stored in synchronous SRAM (SSRAM).
- Management of shared memory—Uniformly allocates
incoming data packets throughout the router’s shared memory.
- Transfer of outgoing data packets—Passes data packets
to the destination Fixed Interface Card (FIC) or Physical Interface
Card (PIC) when the data is ready to be transmitted.
- Transfer of exception and control packets—Passes
exception packets to the microprocessor on the CFEB, which processes
almost all of them. The remainder are sent to the Routing Engine for
further processing. Any errors originating in the Packet Forwarding
Engine and detected by the CFEB are sent to the Routing Engine using
system log messages.
The M10i router has two CFEBs, one that is configured to act
as the master and the other that serves as a backup in case the master
fails. You can initiate a manual switchover by issuing the request
chassis cfeb master switch command. For more information, see
the JUNOS System Basics and Services Command Reference.
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