![cisco mac address table via snmp cisco mac address table via snmp](https://i.ytimg.com/vi/7aG0l4VrlEE/hqdefault.jpg)
For instance, the switch vIOS-L2-1 (192.168.1.1) is configured with a security level AuthPriv, while the switch vIOS-L2-2 (192.168.1.10) is configured with a level NoAuthNoPriv. The switches configured with SNMP version 3 contain different security levels configuration. The switches are configured with different SNMP versions in order to test syntax of snmpwalk command used by BASH script. The SNMP version 2c is configured on the switch with IP address 192.168.1.30 and a version 3 is configured on the rest switches. This part shows configuration of SNMP agents on Cisco switches and an example of using snmpwalk command that is used to query SNMP agents. SNMP Configuration on Switches and SNMPwalk The switch is statically configured with IP address 172.17.100.45/16.Ģ. Thanks to NAT connection the NMS station has connectivity to the network 172.17.0.0/16 where is a Cisco Catalyst 3550 switch located. The IP address of the Ethernet1 interface is 10.0.2.15/24 and it is obtained automatically from Qemu built-in DHCP server (subnet 10.0.2.0/24). The cloud device is connected to the subnet 172.17.0.0/16 using NAT created by Qemu. The first interface - Ethernet0 is connected to the subnet 192.168.1.0/24 and it has assigned an IP address 192.168.1.2/24. The second interface Ethernet1 is connected to a cloud device (元 switch icon labeled with description c3550). The NMS station is occupied with two network interfaces. The hosts obtain IP addresses automatically from DHCP server configured on switch vIOS-L2-1 (192.168.1.1). Switches have their SVI interfaces statically configured with IP address from subnet range 192.168.1.0/24. Using a hardware switch in the lab is a must as vIOS-L2 instances can only provide info about hosts connected to VLAN 1. The only exception is a Cisco Catalyst 3550 switch that is connected to topology via GNS3 network cloud device.
Cisco mac address table via snmp software#
X86-64 Linux Fedora with installed GNS3 1.3.11 and Qemu1.4.0Ĭisco vIOS l2 Software (vios_l2-ADVENTERPRISEK9-M), Version 15.2Ĭisco Catalyst 3550 (C3550-IPSERVICESK9-M), Version 12.2(55)SE9Īll virtual network and host devices are running inside GNS3 project and they are emulated by Qemu emulator and virtualizer. Network hosts are simulated by Core Linux appliances connected to Cisco vIOS-l2 switches.ġ.1 List of software used for creating GNS3 lab The topology consists of three Cisco virtual switch appliances running vIOS-L2 and one network management station (NMS) based on Kali Linux. For this purpose I have created a test network lab using GNS3. We will configure SNMP version 2c and 3 on Cisco switches and create a BASH script that collects required data for us. The goal of this article is to introduce a script that automates a process of collecting MAC and IP address of hosts connected to Cisco switches using Simple Network Management Protocol ( SNMP).