Juniper JUNOS - NETWORK OPERATION GUIDE REV1 User Manual

Understanding Key Router Components ! 101
Chapter 12: Monitoring Key Router Components
Data Flow Through the M320 Router and T640 Routing Node Packet Forwarding
Engine
Data flows through the M320 routing node Packet Forwarding Engine in the
sequence shown Figure 20.
Figure 20: M320 Router Packet Forwarding Engine Components and Data Flow
1. Packets arrive at an incoming PIC interface.
2. The PIC passes the packets to the FPC, where the Layer 2/Layer 3 Packet
Processing ASIC performs Layer 2 and Layer 3 parsing and divides the packets
into 64-byte cells.
3. The Switch Interface ASIC extracts the route lookup key, places it in a
notification and passes the notification to the Internet Processor ASIC. The
Switch Interface ASIC also passes the data cells to the Queuing and Memory
Interface ASICs for buffering.
4. The Queuing and Memory Interface ASICs pass the data cells to memory for
buffering.
5. The Internet Processor ASIC performs the route lookup and forwards the
notification to the Queuing and Memory Interface ASIC.
RDRAM
Internet
Processor
ASIC
Internet
Processor
ASIC
PIC
PIC
Switch
Fabric
Switch
Fabric
RDRAM
Midplane
g003467
Layer 2/Layer 3
Packet
Processing
ASIC
Layer 2/Layer 3
Packet
Processing
ASIC
Queuing and
Memory
Interface
ASICs
Queuing and
Memory
Interface
ASIC
Switch
Interface
ASIC
Queuing and
Memory
Interface
ASIC
Switch
Interface
ASIC
Switch
Interface
ASIC
Switch
Interface
ASIC
Queuing and
Memory
Interface
ASICs
Packets
in
Packets
out

Juniper JUNOS - NETWORK OPERATION GUIDE REV1 Specifications

General

Brand	Juniper
Model	JUNOS - NETWORK OPERATION GUIDE REV1
Category	Software
Language	English