M320 Routing Engine Description - Juniper M320 Hardware Manual

M320 Multiservice Edge Router Hardware Guide
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M320 Routing Engine Description

24
NOTE: For specific information about Routing Engine components (for
example, the amount of DRAM), issue the
command.
NOTE: If two Routing Engines are installed, they must both be the same
hardware model.
Maintaining the M320 Host Subsystem on page 269
Taking the M320 Host Subsystem Offline on page 213
The Routing Engine runs the Junos operating system (OS). The software processes that
run on the Routing Engine maintain the routing tables, manage the routing protocols
used on the router, control the router interfaces, control some chassis components, and
provide the interface for system management and user access to the router.
You can install one or two Routing Engines in the router. The Routing Engines install into
the upper rear of the chassis in the slots labeled
a CB to be installed in the adjacent slot.
CB1 . A Routing Engine does not power up if a CB is not present in the adjacent slot.
If two Routing Engines are installed, one functions as the master, and the other acts as
the backup. If the master Routing Engine fails or is removed, and the backup is configured
appropriately, the backup can take over as the master. If the Routing Engines are
configured for nonstop active routing, the backup Routing Engine automatically
synchronizes its configuration and state with the master Routing Engine. Any update to
the master Routing Engine state is replicated on the backup Routing Engine. If the backup
Routing Engine assumes mastership, packet forwarding continues through the router
without interruption. For more information about nonstop active routing, see the Junos
OS High Availability Library for Routing Devices.
The master Routing Engine (if nonstop active routing is configured) and the backup
Routing Engine are hot-removable and hot-insertable. A nonredundant Routing Engine
or master Routing Engine (if nonstop active routing is not configured) is hot-pluggable.
The M320 router supports the following Routing Engines:
RE-600-2048
RE-1600-2048
RE-A-2000-4096
RE-A-1800x2 for Junos OS Release 10.4.
show chassis routing-engine
and . Each Routing Engine requires
RE0 RE1
installs below , and
RE0 CB0
Copyright © 2015, Juniper Networks, Inc.
installs above
RE1