Routing Engine - Juniper M Series Monitoring And Troubleshooting Manual

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Routing Engine

Copyright © 2012, Juniper Networks, Inc.
The Switch Interface ASIC sends bandwidth requests through the switch fabric to the
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destination port. The Switch Interface ASIC also issues read requests to the Queuing
and Memory Interface ASIC to begin reading data cells out of memory.
The destination Switch Interface ASIC sends bandwidth grants through the switch
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fabric to the originating Switch Interface ASIC.
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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TX Matrix Plus Router Overview on page 43
The Routing Engine consists of the Junos OS running on an Intel-based Peripheral
Component Interconnect (PCI) platform. The Junos OS kernel supports the Junos OS
system processes which handle system management processes, routing protocols, and
control functions (see Figure 34 on page
The Routing Engine handles all the routing protocol processes, as well as other software
processes that control the router interfaces, the chassis components, system
management, and user access to the router. These routing and software processes run
on top of a kernel that interacts with the Packet Forwarding Engine.
The Routing Engine has a dedicated 100-Mbps internal connection to the Packet
Forwarding Engine.
Chapter 4: Monitoring Key Router Components
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