Figure 8: M10I High-Availability Chassis Manager - Juniper M10i Hardware Manual

M10i Multiservice Edge Router Hardware Guide
22
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The HCM performs the following functions:
Monitoring and control of router components—The HCM collects statistics from all
sensors in the system. When it detects a failure or alarm condition, it sends a signal to
the Routing Engine, which generates control messages or sets an alarm. The HCM also
relays control messages from the Routing Engine to the router components.
Controlling component power-up and power-down—The HCM controls the power-up
sequence of router components as they start and powers down components when
their offline buttons are pressed.
Signaling of mastership—In a router with more than one Routing Engine, the HCM
signals to all router components which Routing Engine is the master and which is the
standby.
Alarm display—If an alarm exists, the HCM displays the alarm condition. For more
information, see "M10i HCM Alarm LEDs" on page 23.
PIC removal—If a PIC offline button is pressed, the HCM relays the request to the CFEB
or CFEB-E, which takes the PIC offline and informs the Routing Engine. Other PICs are
unaffected, and system operation continues. For more information, see "M10i HCM
LEDs" on page 23.

Figure 8: M10i High-Availability Chassis Manager

Each HCM (shown in Figure 8 on page 22) has the following components:
100-Mbps Fast Ethernet switch—Carries signals and monitoring data between router
components.
Two LEDs—Indicate HCM status. There is a green one labeled
labeled . "M10i HCM LEDs" on page 23 describes the LED states.
MSTR
Alarm LEDs—Display alarm conditions, if any exist.
PIC offline buttons—Relays a request to the CFEB or CFEB-E, which prepares a PIC for
removal from the router, or brings the PIC online when it is replaced.
Offline buttons for one row of PICs are located on each HCM (see Figure 8 on page 22).
Pressing the button relays a request to the CFEB or CFEB-E, which prepares the PIC
for removal from the router, or brings it online when it is replaced. The HCM in slot
controls PICs on FPC . The HCM in slot
0
labeled with the PIC slot numbers. The PIC slots on the upper FPC are numbered from
PWR
controls PICs on FPC . The buttons are
1 1
Copyright © 2010, Juniper Networks, Inc.
and an blue one
0