JUNOS Internet Software Network Operations Guide: Hardware
624 ! Understanding Redundant HCMs
Understanding Redundant HCMs
Purpose You monitor and maintain HCMs on the M10i router so that they can monitor and
control router components, control component power-up and power-down, signal
which Routing Engine is master, display alarm conditions, and take PICs offline.
What Are Redundant
HCMs
Two HCMs are installed in an M10i router. Each HCM works with a companion
Routing Engine.
Two HCMs are installed into the midplane from the front of the chassis, as shown in
Figure 234. The master HCM performs all functions and provides PIC removal
buttons for the first Flexible PIC Concentrator (FPC). The standby HCM provides PIC
removal buttons for the second FPC. The HCM in the slot labeled
HCM0 is paired
with the Routing Engine in the slot labeled
RE0. Likewise, the HCM in the slot
labeled
HCM1 is paired with the Routing Engine in the slot labeled RE1. By default,
the HCM in the slot labeled HCM0 is the master.
Figure 234: Redundant HCMs
When HCM mastership changes because of failure, Routing Engine mastership also
changes.
The HCM is hot-pluggable.
See Also ! M10i Internet Router Overview on page 11
! Monitoring the HCM on page 431
! Host Redundancy Overview on page 463
! Monitoring Redundant Routing Engines on page 491
g002297
HCMs
HCM0
HCM1
M10i front
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