Understanding the CFEB ! 419
Chapter 32: Monitoring the CFEBs
Understanding the CFEB
Purpose Monitor the CFEB so that it can provide route lookup, filtering, and switching on
incoming data packets and direct outbound packets to the appropriate interface for
transmission to the network.
What Is an CFEB The CFEB processes 16 Mpps. 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 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.
! (M7i router only) Built-in tunnel interface—Encapsulates arbitrary packets
inside a transport protocol, providing a private, secure path through an
otherwise public network.
The built-in tunnel interface on the CFEB is configured the same way as a PIC.
For information about configuring the built-in tunnel interface, see the JUNOS
Services Interfaces Configuration Guide.
! (M7i router only) Optional Adaptive Services PIC–Integrated (ASP–I)—Provides
one or more services on one PIC. See “Adaptive Services PIC–Integrated
(ASP–I)” on page 11 for more information.
Figure 168 shows the M7i router CFEB component.
Figure 168: M7i Router CFEB
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