Dell Networking N4000 Series Configuration Manual page 336

Figure 13-10. Add SNMPv1,2 Community
3 Specify the IP address of an SNMP management station and the
community string to act as a password that will authenticate the
management station to the SNMP agent on the switch.
4 Select the access mode.
5 Click Apply to update the switch.
Click Show All to view the communities that have already been configured.
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Configuring SNMP