How to recover a Cisco device password
Last Updated on Saturday, 14 January 2012 01:18 Written by A.Jesin Saturday, 14 January 2012 01:18
Even if you forget your Cisco device (read router or switch) password you can recover it by following the steps outlined in this article. This includes enable passwords, secret passwords, telnet, SSH and console passwords. This process involves changing the configuration register of your Cisco device so that it ignores the NVRAM contents and loads the default configuration. For this process you have to get into the ROM monitor mode so you need to have serial console access to the Cisco switch/router. Read More…
How to Configure a Cisco router as a Frame Relay Switch
Last Updated on Sunday, 18 December 2011 01:48 Written by A.Jesin Sunday, 18 December 2011 01:48
Frame relay is a WAN technology that uses packet switching methodology for communication. A frame relay switch is required for configuring a frame relay network. The previous article on Configuring Frame Relay on Cisco Packet Tracer explains it on a simulator, in this article I’ll show how a Cisco router can be used as a frame relay switch. The same hub and spoke topology is used, only the Frame Relay switch router configuration is explained here refer the previous article for the Hub router and spoke routers configuration instructions. Read More…
How to configure frame relay in Cisco Packet Tracer
Last Updated on Sunday, 4 December 2011 08:10 Written by A.Jesin Sunday, 4 December 2011 08:10
This article will explain frame relay configuration in Cisco Packet Tracer. Frame relay is a WAN technology. Read the Wikipedia article to learn more about Frame Relay. You can also try this on live routers and other network simulators, but the frame relay switch configuration varies. The setup here will use the hub and spoke configuration, Router0 is the hub, Router1 and Router2 are the spokes. Point-to-Point subinterfaces are created and PVCs (Permanent Virtual Circuits) are established between Router0 and Router1 and Router0 and Router2. So the Spoke routers communicate via Router0. Read More…
Configure Inter-VLAN routing on Cisco Router
Last Updated on Wednesday, 5 October 2011 03:34 Written by A.Jesin Wednesday, 5 October 2011 03:34
This tutorial explains how to configure InterVLAN routing on Cisco routers. InterVLAN routing allows communication between Virtual LANs. The first part of the tutorial explains how to configure VLAN on the switch and the second part explains how to configure InterVLAN routing on a router.
The following is the connectivity of the switch
fastEthernet 0/1 - Router
fastEthernet 1/1 (VLAN 2) - PC0
fastEthernet 2/1 (VLAN 2) - PC1
fastEthernet 3/1 (VLAN 3) - PC2
fastEthernet 4/1 (VLAN 3) - PC3
fastEthernet 5/1 (VLAN 4) - PC4
fastEthernet 6/1 (VLAN 4) - PC5
The image below shows the topology of the network. Read More…
How to set the time in Cisco devices
Last Updated on Monday, 3 October 2011 01:37 Written by A.Jesin Monday, 3 October 2011 01:37
A quickie explaining how to set the clock in Cisco routers and switches. Setting the correct time is important when logging the activities of a Cisco device. To display date and time use the following command in privileged mode
R1#show clock
To set the correct time enter the following command in privileged mode
R1#clock set hh:mm:ss MONTH <Day of the month> <Year>
Example
R1#clock set 13:35:00 oct 3 2011
Cisco Account Lockout using login block-for
Last Updated on Thursday, 22 September 2011 05:11 Written by A.Jesin Thursday, 22 September 2011 05:11
Account lockout policies can be implemented on Cisco equipment to prevent Brute-Force attacks. This tutorial will explain how to use login block-for command to block users if they exceed a certain number of incorrect login attempts. The login block-for command will block all telnet and SSH connections to that router if incorrect credentials are entered for a specified number of times. Read More…
