- Cisco mac address table timeout how to#
- Cisco mac address table timeout software#
- Cisco mac address table timeout mac#
For this reason I had to connected Catalyst 3550 switch to GNS3 lab in order to tell the script to collect data from other VLANs.Ģ.1 Cisco Switch vIOS-L2-1 (192.168.1.1) configured for SNMPv3 and Security Level AuthPriv
Cisco mac address table timeout mac#
It is an old hardware switch and I use it in a lab for collecting MAC and IP addresses of hosts connected to switchports that are assigned to VLANs different from VLAN 1.Īs I have mentioned before, I was only successful with collecting MACs of host connected to switchports in VLAN 1 of virtual switches (running vIOS-L2 image). The security level AuthNoPriv is configured on the switch vIOS-L2-3 (192.168.1.20).Ĭisco Catalyst 3550 (172.17.100.45) contains SNMP version 3 configuration with a security level AuthPriv. 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 timeout 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. LIConfigurationGuide/MACAddress.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). Switch(config)# mac-address-table aging-time 600
Cisco mac address table timeout how to#
This example shows how to set the aging time for entries in the MAC address table to 600 seconds (10 minutes): If a VLAN is not specified, the aging specification applies to all Entering the value 0 disables the MAC aging. Range is from 0 to 1000000 the default is 300 seconds. Switch(config)# mac-address-table aging-time seconds Specifies the time before an entry ages out and is discarded from the MAC address table. To configure the aging time for all MAC addresses, perform this task: You can configure the amount of time that an entry (the packet source MAC address and port that packet ingresses) remain in the MAC table. The MAC address-table will hold addresses 180 seconds longer than the default of 10 minutes. The default timeout period will be 360 seconds.ĪRP requests will be processed less frequently by the switch. The MAC address-table will be flushed every 3 minutes.
This is how long a dynamic MAC address will remain in the CAM table.
What effect does the mac address-table aging-time 180 command have on the MAC address- table?
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