Configuring SNMP

SNMP agent provides read-write access for specific OIDs. Refer OIDs that supports SNMP write for the list of OIDs that supports write operations.

Procedure

1. SNMP is not enabled on the switch by default, unless the user enables it over any available VRF or with the default/mgmt VRF using the command snmp-server vrf <NAME>. For example, use the command snmp-server vrf mgmt to enable SNMP on the management interface. Use the command snmp-server vrf default to enable SNMP on the default VRF. Use the command snmp-server vrf <USERDEFINED_VRF_NAME> to enable SNMP on the user created VRF.
2. Set the system contact, location, and description for the switch with the following commands:
   • snmp-server system-contact
   • snmp-server system-location
   • snmp-server system-description

   You can also set the system location and system contact values using SNMP.

3. If required, change the default SNMP port on which the agent listens for requests with the command snmp-server agent-port.
4. By default, the agent uses the community string public to protect access through SNMPv1/v2c. Set a new community string with the command snmp-server community.
5. Configure the trap receivers to which the SNMP agent will send trap notifications with the command snmp-server host.
6. Create an SNMPv3 context and associate it with any available SNMPv3 user to perform context specific v3 MIB polling using the command snmpv3 user <V3_USERNAME> context <CONTEXT_NAME>.
7. Create an SNMPv3 context and associate it with an available SNMPv1/v2c community string to perform context specific v1/v2c MIB polling using the command snmpv3 context <CONTEXT_NAME> vrf <VRF_NAME> community <COMMUNITY_NAME>.
8. Review your SNMP configuration settings with the following commands:
   • show snmp agent-port
   • show snmp community
   • show snmp system
   • show snmpv3 context
   • show snmp trap
   • show snmp vrf
   • show snmpv3 users
   • show tech snmp

Example 1

This example creates the following configuration:

• Enables SNMP on the out-of-band management interface (VRF mgmt).
• Sets the contact, location, and description for the switch to: JaniceM, Building2, LabSwitch.
• Sets the community string to Lab8899X.

Example 2

This example creates the following configuration:

• Creates an SNMPv3 user named Admin using sha authentication with the plaintext password mypassword and using des security with the plaintext password myprivpass.
• Associates the SNMPv3 user Admin with a context named newContext.