SNMP is an application-layer protocol that provides a message format for communication between SNMP managers and agents. The SNMP manager is the system used to control and monitors the activities of network hosts using SNMP; this is also called Network Management Station (NMS). This article explains how to configure Simple Network Management Protocol (SNMP) community strings on Cisco routers and Catalyst switches to enable SNMP agent. The configuration of SNMP on Cisco devices is very simple, and is handled from global configuration mode.
We must define the relationship between the SNMP manger and Client. The command to enable SNMP client on the Cisco Router is snmp community, followed by the community name. This command also allows you to configure the SNMP agent as read only or for both read and write access. If not specified, by default it will be configured as read only. In this case, you configured community name to public, allowing both read and write access. This will allow an NMS to both configure and gather information from our managed device. SNMP settings are configured from global configuration mode.
Enable SNMP Community Strings on Cisco Router
1. Telnet into the Router or Switch, Type “enable” to get in to enable mode. Enter the enable password.
prompt# telnet 192.168.1.1
Router>enable
Password:
Router#
2. Get into global configuration mode by typing “configure terminal” and find available commands for SNMP configuration on Cisco Router.
Router(config)#
Router(config)#snmp-server ?
chassis-id String to uniquely identify this chassis
community Enable SNMP; set community string and access privs
contact Text for mib object sysContact
context Create/Delete a context apart from default
drop Silently drop SNMP packets
enable Enable SNMP Traps
engineID Configure a local or remote SNMPv3 engineID
file-transfer File transfer related commands
group Define a User Security Model group
host Specify hosts to receive SNMP notifications
ifindex Enable ifindex persistence
inform Configure SNMP Informs options
ip IP ToS configuration for SNMP traffic
location Text for mib object sysLocation
manager Modify SNMP manager parameters
packetsize Largest SNMP packet size
queue-length Message queue length for each TRAP host
source-interface Assign an source interface
system-shutdown Enable use of the SNMP reload command
tftp-server-list Limit TFTP servers used via SNMP
trap SNMP trap options
trap-source Assign an interface for the source address of all traps
trap-timeout Set timeout for TRAP message retransmissions
user Define a user who can access the SNMP engine
view Define an SNMPv2 MIB view
3. Enable SNMP with the following command:
Router(config)#snmp-server community <community-string> ro
Router(config)#snmp-server community <community-string> rw
Router(config)#snmp-server community public rw
Here community-string is the actual community string. The “ro” means read-only and “rw” for read-write.
4. Use the snmp–server host command to specify which host or hosts receive SNMP traps.
Router(config)#snmp-server host <ip-address> <community-string>
Here “ip-address” is the IP address of the SNMP management station and “community-string” is the actual community string.
5. Enable the Router to send Simple Network Management Protocol traps or informs (SNMPnotifications), use the snmp-server enable traps global configuration command. After this command is executed, SNMP traps will be sent automatically to the SNMP management station configured in the previous step.
Router(config)#snmp-server enable traps
This command turns on all the varieties of traps. You can also turn on specific traps, by appending them to the above command, one trap variant at time. Some allow for further specificity. For example
Router(config)#snmp-server enable traps frame-relay
Router(config)#snmp-server enable traps envmon temperature
Router(config)#snmp-server enable traps bgp
Router(config)#snmp-server enable traps snmp
6. Exit configuration mode with the command “exit”, save the new SNMP configuration with the command “write memory” or “copy run start”.
Router#write memory
Building configuration…[OK]
Router#
SNMP Configuration Example on a Cisco Router
prompt#telnet 192.168.1.1
Router>enable
Password:
Router#configure terminal
Enter configuration commands, one per line. End
with CNTL/Z.Router(config)#
Router(config)#snmp-server community public RO
Router(config)#snmp-server community cisco@123 RW
Router(config)#snmp-server host 172.18.42.10 public
Router(config)#snmp-server enable traps
Router(config)#exit
Router#Router#write memory
Building configuration…[OK]Router#
—Reference From https://www.ciscoconsole.com/nms/snmp/how-to-configure-snmp-on-cisco-ios-based-router-or-switch.html/
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