System Management
7750 SR OS Basic System Configuration Guide Page 221
Active and Standby Designations
Typically, the first Switch Fabric (SF)/CPM card installed in a redundant 7750 SR-Series chassis
assumes the role as active, regardless of being inserted in Slot A or B. The next CPM installed in
the same chassis then assumes the role as the standby CPM. If two CPM are inserted
simultaneously (or almost simultaneously) and are booting at the same time, then preference is
given to the CPM installed in Slot A.
If only one CPM is installed in a redundant routerdevice, then
it becomes the active CPM
regardless of the slot it is installed in.
To visually determine the active and standby designations, the Status LED on the faceplate is lit
green (steady) to indicate the active designation. The Status LED on the second CPM faceplate is
lit amber to indicate the standby designation.
The following output shows that the CPM installed in Slot A is acting as the active CPM and the
CPM installed in Slot B is acting as the standby.
ALA-12# show card
===============================================================================
Card Summary
===============================================================================
slot card card card admin operational
allowed provisioned equipped state state
-------------------------------------------------------------------------------
2 all supported iom-20g iom-20g up up
A all supported sfm-400g sfm-400g up up/active
B all supported sfm-400g sfm-400g up up/standby
===============================================================================
ALA-12#
The following console message displays when a CPM boots, sees an active CPM, and becomes the
standby CPM.
...
Slot A contains the Active CPM
This CPM (Slot B) is the Standby CPM
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