Understanding Redundant MCSs
Purpose
Inspect redundant MCSs to ensure that functions are interrupted, such as component alarm messages; component power-up and power-down; Routing Engine, MCS, and PCG mastership control; SONET clock generation and monitoring; and system clock monitoring.
What Are Redundant MCSs
Redundant MCSs are two MCSs installed in the M40e or M160 router.
The MCS is a component of the host module. Each MCS requires a Routing Engine to be installed in an adjacent slot. MCS0 installs above slot RE0, and MCS1 installs below slot 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.
If two MCSs are installed, MCS0 acts as the master MCS and MCS1 acts as a backup. If the master MCS fails or is removed, the backup restarts and becomes the master MCS.
The MCSs install into the midplane from the back of the chassis (see Figure 228).
