Cisco IOS

Reference: https://www.cisco.com/c/en/us/support/docs/ip/simple-network-management-protocol-snmp/7282-12.html

The procedure below is the same for both routers, Cisco IOS software-based XL Catalyst Switches, RSMs and multilayer switch feature card (MSFC). This means you can complete the same procedure in order to enable SNMP on an RSM.

configure terminal
!
snmp-server community public RO
!
snmp-server community private RW
!
exit
!
write memory

Catalyst OS

On Catalyst switches that run the catalyst Operating System (OS), SNMP is enabled by default with the community strings set to:

With these community strings and the IP address of your switch’s management interface, anyone is able to reconfigure the device. It is very important to change the community strings on the Catalyst switch immediately after you set the device on the network.

set snmp community read-only XXXX
!
set snmp community read-write YYYY

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