Leading Cisco networking products distributor-3network.com

1. How to Configure SNMP on Cisco IOS-based Router/Switch?
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
1

2. ip
location
manager
packetsize
queue-length
source-interface
system-shutdown
tftp-server-list
trap
trap-source
trap-timeout
user
view
IP ToS configuration for SNMP traffic
Text for mib object sysLocation
Modify SNMP manager parameters
Largest SNMP packet size
Message queue length for each TRAP host
Assign an source interface
Enable use of the SNMP reload command
Limit TFTP servers used via SNMP
SNMP trap options
Assign an interface for the source address of all traps
Set timeout for TRAP message retransmissions
Define a user who can access the SNMP engine
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 “communitystring” 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
2

3. 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]
Configuring Static NAT on a Cisco ASA Security Appliance
3Anetwork.com is a world leading Cisco networking products wholesaler, we wholesale original new
Cisco networking equipments, including Cisco Catalyst switches, Cisco routers, Cisco firewalls, Cisco
wireless products, Cisco modules and interface cards products at competitive price and ship to
worldwide.
Our website: http://www.3anetwork.com
Telephone: +852-3069-7733
Email: info@3Anetwork.com
Address: 23/F Lucky Plaza, 315-321 Lockhart Road, Wanchai, Hongkong
3