Restarting SNMP process on a VC that has at least one member configured as linecard will exhibit the following errors:

root@switch> restart snmp gracefully all-members

...

fpc2:

--------------------------------------------------------------------------

error: Simple Network Management Protocol process is not running

error: Simple Network Management Protocol process was not restarted

fpc3:

--------------------------------------------------------------------------

error: Simple Network Management Protocol process is not running

error: Simple Network Management Protocol process was not restarted

fpc4:

--------------------------------------------------------------------------

error: Simple Network Management Protocol process is not running

error: Simple Network Management Protocol process was not restarted

These errors are expected. In a virtual-chassis setup, the SNMP process does not need to run on each individual member switch, it only needs to be running on the master switch. The master switch is responsible for handling SNMP requests and managing the SNMP data for the entire virtual chassis, that’s why SNMP does not run on the line-cards.