System Management
Basic System Configuration Guide 247
Active and Standby Designations
Typically, the first Switch Fabric (SF)/CPM card installed in a redundant SR-series router
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 router device, then it becomes the active CPM
regardless of the slot it is installed in.
The active and standby designations can be visually determined by LEDs on the CPM/CFM/
CCM faceplate. Please see the appropriate platform Installation Guide for LED indicator
details.
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.
The following is an example of the 7950 XRS output:
*A:7950 XRS-20# show card
===============================================================================
Card Summary
===============================================================================
Slot Provisioned Type Admin Operational Comments
Equipped Type (if different) State State
-------------------------------------------------------------------------------
1 xcm-x20 up provisioned
A cpm-x20 up up/active
B cpm-x20 up up/standby
===============================================================================
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
When the Active CPM Goes Offline
When an active CPM goes offline (due to reboot, removal, or failure), the standby CPM takes
control without rebooting or initializing itself. It is assumed that the CPMs are synchronized,
therefore, there is no delay in operability. When the CPM that went offline boots and then
comes back online, it becomes the standby CPM.
When the standby CPM comes online, the following output displays:
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