Understanding the Routing Engine ! 135
Chapter 14: Monitoring the Routing Engine
Routing Engine Redundancy
Table 33 show the routing platforms that can have redundant Routing Engines. See
“Routing Engine Component Companionship” on page 135.
Table 33: Redundant Routing Engines
Routing Engine Component Companionship
On the M10i router, the Routing Engine works with its companion High-Availability
Chassis Manager (HCM) to provide control and monitoring functions for router
components. For more information about the HCM, see “Monitoring the HCM” on
page 431. For more information about monitoring Redundant HCMs, see
“Monitoring Redundant HCMs” on page 623.
For information about monitoring redundant Routing Engines, see “Host
Redundancy Overview” on page 463 and “Monitoring Redundant Routing Engines”
on page 491.
On the M40e and M160 routers, the host module provides the routing and system
management functions. The host module consists of the Routing Engine and the
Miscellaneous Control Subsystem (MCS). For more information about the host
module, see “Monitoring the Host Module” on page 341. For more information
about the MCS, see “Monitoring the MCS” on page 359.
On the M320 router, T320 router, and T640 routing node, the host subsystem
provides the routing and system management functions. The host subsystem
consists of the Routing Engine and the Control Board. For more information about
the host subsystem, see “Monitoring the Host Subsystem” on page 289. For
information about the Control Boards, see “Monitoring the Control Board” on
page 301.
For more detailed information about the Routing Engine, see the appropriate router
hardware guide.
Routing Engine Boot Devices
Generally the router boots on the primary boot device, which is the flash disk. This
device contains the current router configuration and the last three committed
configurations in the
juniper.conf, juniper.conf.1.gz, juniper.conf.2.gz, and
juniper.conf.3.gz files, respectively. These files are located in the /config directory.
If the flash disk fails, the router attempts to boot from the hard disk, which is the
alternate boot device.
If a removable media is installed when the router boots, the router attempts to boot
the image on it. If the booting fails, the router tries the flash drive and then the hard
disk.
Characteristic
M5/
M10
M7i M10i M20 M40 M40e/M160
M320/T320/
T640
Redundant Routing Engines X
works with
HCM
XX
(Host Module)
works with MCS
X
(Host Subsystem)
works with
Control Board
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