JUNOS Internet Software Network Operations Guide: Hardware
360 ! Understanding the MCS
Understanding the MCS
Purpose Inspect the MCS to ensure that control and monitoring functions for router
components and SONET/SDH clocking for the router function normally.
What Is an MCS The MCS is a component of the host module on M40e and M160 routers (see
Figure 148). The MCS works with the Routing Engine to provide control and
monitoring functions for router components and to provide SONET/SDH clocking
for the router.
Figure 148: MCS Component
The router can be equipped with up to two MCSs for redundancy. If two MCSs are
installed, one acts as the master MCS and the other acts as a backup. If the master
MCS fails or is removed, the backup MCS restarts and becomes the master MCS.
Each MCS requires a Routing Engine to be installed in an adjacent slot.
MCS0
installs above
RE0, and MCS1 installs below RE1. Even if an MCS is physically
installed in the chassis, it does not function if there is no Routing Engine present in
the adjacent slot.
1178
Extractor clip
Extractor clip
Offline button
LEDs
NOTE: The host modules (RE0 working with MCS0 and RE1 working with MCS1)
actually have the master and backup role.
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