Data Flow Through The Tx Matrix Router Packet Forwarding Engine - Juniper M Series Monitoring And Troubleshooting Manual

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Data Flow Through the TX Matrix Router Packet Forwarding Engine

Copyright © 2012, Juniper Networks, Inc.
Upon receipt of each bandwidth grant, the originating Switch Interface ASIC sends a
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cell through the switch fabric to the destination Packet Forwarding Engine.
The destination Switch Interface ASIC receives cells from the switch fabric. It extracts
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the route lookup key from each cell, places it in a notification, and forwards the
notification to the T Series Internet Processor.
The T Series Internet Processor performs the route lookup, and forwards the
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notification to the Queuing and Memory Interface ASIC.
The Queuing and Memory Interface ASIC forwards the notification, including next-hop
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information, to the Switch Interface ASIC.
The Switch Interface ASIC sends read requests to the Queuing and Memory Interface
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ASIC to read the data cells out of memory, and passes the cells to the Layer 2/Layer
3 Packet Processing ASIC.
The Layer 2/Layer 3 Packet Processing ASIC reassembles the data cells into packets,
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adds Layer 2 encapsulation, and sends the packets to the outgoing PIC interface.
The outgoing PIC sends the packets out into the network.
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T320 Core Router Overview on page 27
T640 Core Router Overview on page 31
T1600 Core Router Overview on page 34
Data flows through the TX Matrix router Packet Forwarding Engine in the following
sequence shown in Figure 32 on page
Chapter 4: Monitoring Key Router Components
134.
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