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show chassis environment mcs



(M40e and M160 routers only) Display environmental information about the Miscellaneous Control Subsystems (MCSs).



Display environmental information about both MCSs.


(Optional) Display environmental information about an individual MCS. Replace slot with 0 or 1

Required Privilege Level


Output Fields

Table 1 lists the output fields for the show chassis environment mcs command. Output fields are listed in the approximate order in which they appear.

Table 1: show chassis environment mcs Output Fields

Field Name

Field Description


Status of the MCS:

  • Present—MCS is detected by the chassis daemon but is either not supported by the current version of Junos or MCS is coming up but not yet online.

  • Online—MCS is online and running.

  • Offline—MCS is powered down.

  • Empty—No MCS is present.

  • Master—MCS is online, operating as primary.

  • Standby—MCS is online, operating as standby.


Temperature of the air flowing past the MCS.


Information about the voltage supplied to the MCS. The left column displays the required power, in volts. The right column displays the measured power, in millivolts.

BUS Revision

Revision level of the generic bus device.

FPGA Revision

Revision level of the field-programmable gate array (FPGA) revision.

Sample Output

show chassis environment mcs (M40e Router)

show chassis environment mcs (M160 Router)

Release Information

Command introduced before Junos OS Release 7.4.