Contents

SNMP Monitoring of the Switch                                                                      2

1. Introduction                                                                                             2

2. Configuring SNMPv3 in CLI                                                                      2

3. Testing SNMPv3 in Linux                                                                         3

SNMP Monitoring of the Switch

1. Introduction

SNMP or Simple Network Management Protocol is a networking protocol designed for managing and monitoring network-connected devices in IP networks. The devices can be routers, switches, firewalls, gateways, servers, printers etc. All SNMP messages are transported via UDP (User Datagram Protocol). The SNMP agent receives requests on port 161.

SNMPv3 provides the following authentication possibilities.

●     No authentication and no privacy (noAuthNoPriv) - used for monitoring

●     Authentication and no privacy (authNoPriv) - used for control

●     Authentication and privacy (authPriv) - used for downloading encrypted information

2. Configuring SNMPv3 in CLI

In CLI enter the following commands to enable SNMPv3 on the switch:

Switch>enable

(Note: You must enter into the privileged mode using the ‘enable’ command in case you are using the Telnet option to access the switch.)

Switch#configure terminal

Switch(config)#security-manage snmp enable

Switch(config)#snmp user <user_name(user-defined)> {ro | rw} auth {md5 | sha} <auth_password(user-defined)> priv des <priv_password(user-defined)>

Switch(config)#exit

​

Switch#write

(ro stands for read only and rw stands for read write)

Example: Configuring ‘sw-1’ as the user name with read-only purview and providing authentication and encryption password to it.

Switch#configure terminal

Switch(config)#security-manage snmp enable

Switch(config)#snmp user sw-1 ro auth sha 1234567890 priv des 0987654321

Switch(config)#exit

To display the SNMP user  information, enter the following command

Switch#show snmp user

Note: SNMPv3 feature is unavailable on the Web GUI.

3. Testing SNMPv3 in Linux

On the Linux server enter the following commands to install SNMP management server:

sudo apt-get update

sudo apt-get install snmp snmpd libsnmp-dev

Make sure that the server and the switch are in the same subnet. Enter the following command to test if SNMP is working:

snmpwalk -v3 -l authpriv sha  -a 123456789 -x des -X 0987654321 -u sw-1 192.168.0.97

If you find a list of OIDs as an output at the end, then SNMP is working on the device.