JUNOS Internet Software Network Operations Guide: Hardware
618 ! Understanding Redundant CFEBs
Understanding Redundant CFEBs
Purpose Monitor redundant CFEBs so they 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 Are Redundant
CFEBs
Two CFEBs are installed in the M10i router. The M10i router CFEB processes 16
Mpps.
The CFEB performs the following functions:
! Route lookups—Performs route lookups using the forwarding table stored in the
synchronous SRAM (SSRAM).
! Shared memory management—Uniformly allocates incoming data packets
throughout the router’s shared memory.
! Outgoing data packets transfer—Passes data packets to the destination FIC or
PIC when the data is ready to be transmitted.
! Exception and control packet transfer—Passes exception packets to the
microprocessor on the CFEB, which processes almost all of them. The rest 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
Network Interfaces and Class of Service 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.
One or two CFEBs can be installed into the midplane from the rear of the chassis, as
shown in Figure 233 on page 619. Only one CFEB is active at a time; the optional
second CFEB is in standby mode. By default, the CFEB in slot
CFEB 0 is active. To
modify the default, include the appropriate
cfeb statement at the [edit chassis
redundancy]
hierarchy level of the configuration, as described in the section about
CFEB redundancy in the JUNOS System Basics Configuration Guide.
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