Hello poojaryp1974,
According to your router series...it is recommended to configure SNMPv3....
Please go through the following link....that helps you to enable snmpv3:
https://www.cisco.com/c/en/us/td/docs/iosxr/ncs5xx/system-management/75x/b-system-management-cg-75x-ncs540/implementing-snmp.html
However, if you want to specifically enable SNMPv2 ..please perform the following steps:
Enable SNMP Community Strings
This procedure is the same for both routers and Cisco IOS® software-based XL Catalyst Switches.
1. Telnet to the router:
prompt# telnet 172.16.99.20
2. Enter the enable password at the prompt in order to enter the enable mode:
Router>enable
Password:
Router#
3. Display the running configuration and look for the SNMP information:
Router#show running-config
Building configuration...
....
....
Note: If no SNMP information is present, continue with these steps. If any SNMP commands are listed, you can modify or disable them.
4. Go into the configuration mode:
Router#configure terminal
Enter configuration commands, one per line. End
with CNTL/Z.
Router(config)#
5. Use this command in order to enable the read-only (RO) community string:
Router(config)#snmp-server community public RO
where "public" is the read-only community string.
6. Use this command in order to enable the read-write (RW) community string:
Router(config)#snmp-server community private RW
where "private" is the read-write community string.
7. Exit out of the configuration mode and return to the main prompt:
Router(config)#exit
Router#
8. Write the modified configuration to nonvolatile RAM (NVRAM) to save the settings:
Router#write memory
Building configuration...
[OK]
Router#
Best regards
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