The software installed on Routing Engines which are shipped as spares or replacements might not support the Enhanced MX SCB, and may not be able to function properly.
The Enhanced MX SCB is supported only in Junos OS Release 11.4 or later. The software installed on these Routing Engines needs to be updated when used on MX platform with SCBE
Upgrade the software installed on these Routing Engines when used with Enhanced MX SCB using one of these upgrade methods: