9. Upon receipt of each bandwidth grant, the originating Switch Interface ASIC sends a
cell through the switch fabric to the destination Packet Forwarding Engine.
10. The destination Switch Interface ASIC receives cells from the switch fabric. It extracts
the route lookup key from each cell, places it in a notification, and forwards the
notification to the Internet Processor ASIC.
11. The Internet Processor ASIC performs the route lookup, and forwards the notification
to the Queuing and Memory Interface ASIC.
12. The Queuing and Memory Interface ASIC forwards the notification, including next-hop
information, to the Switch Interface ASIC.
13. The Switch Interface ASIC sends read requests to the Queuing and Memory Interface
ASIC to read the data cells out of memory, and passes the cells to the Layer 2/Layer
3 Packet Processing ASIC.
14. The Layer 2/Layer 3 Packet Processing ASIC reassembles the data cells into packets,
adds Layer 2 encapsulation, and sends the packets to the outgoing PIC interface.
15. The outgoing PIC sends the packets out into the network.
Related
Documentation
M320 Multiservice Edge Router Overview on page 23•
Data Flow Through the T320, T640, and T1600 Router Packet Forwarding Engine
Data flows through the T320 router and T640 router Packet Forwarding Engine in the
following sequence shown in Figure 31 on page 132.
131Copyright © 2012, Juniper Networks, Inc.
Chapter 4: Monitoring Key Router Components
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