Figure 33: Tx Matrix Plus Router Packet Forwarding Engine Components And - Juniper M Series Monitoring And Troubleshooting Manual

M Series and T Series Routers Monitoring and Troubleshooting Guide
136
Figure 33: TX Matrix Plus Router Packet Forwarding Engine Components
and Data Flow
Switch fabric
T1600 Router
TXP-T1600 SIBs
T1600 Router
Packets
Packet Forwarding
in
Engines
T1600 Router
TXP-T1600 SIBs
T1600 Router
Packets
Packet Forwarding
in
Engines
Packets arrive at an incoming PIC interface.
1.
The PIC passes the packets to the FPC, where the Layer 2/Layer 3 Packet Processing
2.
ASIC performs Layer 2 and Layer 3 parsing and divides the packets into 64-byte cells.
The Switch Interface ASIC extracts the route lookup key, places it in a notification,
3.
and passes the notification to the T Series Internet Processor. The Switch Interface
ASIC also passes the data cells to the Queuing and Memory Interface ASICs for
buffering.
The Queuing and Memory Interface ASICs pass the data cells to memory for buffering.
4.
The T Series Internet Processor performs the route lookup and forwards the notification
5.
to the Queuing and Memory Interface ASIC.
The Queuing and Memory Interface ASIC sends the notification to the Switch Interface
6.
ASIC facing the switch fabric, unless the destination is on the same Packet Forwarding
Engine. In this case, the notification is sent back to the Switch Interface ASIC facing
the outgoing ports, and the packets are sent to the outgoing port without passing
through the switch fabric (see Step 13).
TX Matrix Plus
TXP-F13 SIBs
Packets
out
T1600 Router
TXP-T1600 SIBs
Switch fabric
Packets
Packets
out in
T1600 Router
TXP-T1600 SIBs
T1600 Router
Packets
Packet Forwarding
in
Engines
T1600 Router
Packets
Packet Forwarding
out
Engines
Copyright © 2012, Juniper Networks, Inc.
Packets
out