Understanding Key Router Components ! 93
Chapter 12: Monitoring Key Router Components
For M-series routers, the Packet Forwarding Engine is implemented in ASICs that
are located on the System Control Board (SCB): a Forwarding Engine Board (FEB)
(M5/M10 router), System and Switch Board (SSB) (M20 router), SCB (M40 router), or
Switching and Forwarding Module (SFM) (M40e and M160 routers). It uses a
centralized route lookup engine and shared memory. For T-series routers, the Packet
Forwarding Engine is implemented in ASICs that are physically located on the
Flexible PIC Concentrator (FPCs) and Physical Interface Card (PICs).
Table 29 lists the Packet Forwarding Engine components for each routing platform.
Table 29: Router Packet Forwarding Engine Components Per Routing Platform
Data Flow Through the Router Packet Forwarding Engine
This section describes the sequence in which data flows through each router Packet
Forwarding Engine.
! Data Flow Through the M5 and M10 Router Packet Forwarding Engine on
page 94
! Data Flow Through the M7i Router Packet Forwarding Engine on page 95
! Data Flow Through the M10i Router Packet Forwarding Engine on page 96
! Data Flow Through the M20 Router Packet Forwarding Engine on page 97
! Data Flow Through the M40 Router Packet Forwarding Engine on page 98
! Data Flow Through the M40e Router Packet Forwarding Engine on page 99
! Data Flow Through the M160 Router Packet Forwarding Engine on page 100
Component
M5/
M10
M7i M10i M20 M40 M40e M160 M320 T320 T640
Midplane X XXXXX X X
PIC X XXXXX X X XX
FPC Built-in X X X X X X X
FIC X
CFEB X X
FEB X
SSB X
SCB X
SFM XX
Layer 2/Layer 3 Packet Processing ASIC X X
Queuing and Memory Interface ASICs X X X
T-series Internet Processor XXX
Switch Interface ASICs XXX
Media-specific ASICs on the PICs X XXXXX X X XX
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