RSSAll Entries in the "Cisco General" Category

How to create a Tunnel interface and configure between Cisco Routers

Create and Configure a Tunnel Interface on Cisco Router  You can create a Tunnel interface on Cisco Router and establish a Tunnel between two locations. Tunnel between two location Routers are useful for load sharing on WAN links or Resources. Below I will share the Tunnel configuration on Cisco Router at both ends to establish a tunnel. Create a Tunnel Interface on Cisco Router Cisco-Router(config)#interface tunnel ? <0-2147483647>  Tunnel interface number Cisco-Router(config)#interface tunnel Tunnel Configuration at A end Cisco Router: interface Tunnel100 description ***Tunnel to B location *** ip address 172.111.1.9 255.255.255.252 keepalive 5 4 tunnel source 172.111.46.1 tunnel destination 172.111.46.104 ! interface Fastethernet 0/0 description *** Tunnel  Source Interface *** ip address 172.111.46.1 255.255.255.0 secondary ip address 10.6.0.2 255.255.0.0 ip accounting output-packets ip pim dense-mode ip route-cache flow ! Tunnel Configuration at B end Cisco Router: interface Tunnel104 description ***Tunnel to  A Location **** ip address 172.111.1.10 255.255.255.252 keepalive […]

Verify Cisco IOS Images Checksum with MD5 File Validation

MD5 File Validation on Cisco Router The MD5 File Validation feature provides a mechanism for users to verify that Cisco IOS image files on Cisco Devices are not corrupted or incomplete. This feature uses the industry-standard MD5 algorithm for improved reliability and security. It’s always advisable to check the MD5 checksum after you downloaded the new IOS image and again after you uploaded the new image to the Cisco device. Otherwise, your Routers may not even able to bootup with corrupted images. There are free MD5 checksum program available on the Internet. One such program is the MD5 Checker. And it’s also probably good idea to store the MD5 value alongside with the image. Run MD5 file validation for Cisco IOS, It computes and displays the MD5 values, note down the MD5 values before uploading into Cisco device. How to Verify Cisco IOS Images Using the MD5 Algorithm on Cisco […]

Show / Find Users Currently Logged into Cisco Router/Switch

We can find or see the users currently logged into your Cisco Routers/Switches and also time, from which IP address users logged into Cisco Router/Switches. In Wide area networks are often very wide and installing or troubleshooting remote Routers often requires login from more than one physical location. It is simple to get a listing of the users logged into a Router and it useful to troubleshoot issues some times. Show Users command on Cisco Router/Switch To find the users logged into a Cisco Router/Switch, issue show users command: Cisco-Router#show users or Cisco-Router#sh users Show/Find Users Currently Logged into Cisco Router/Switch Find below output using show users command on Cisco Router or Switch: Cisco-Router#sh users Line       User       Host(s)                  Idle            Location 1 vty 0     John     172.94.0.86      24w2d     10.90.9.252 2 vty 1     John     172.94.0.86      24w2d     10.90.9.252 3 vty 2     Bijju      idle                    00:00:37 10.90.9.64 4 vty 3     Kanth   172.94.0.94     24w2d     10.90.9.252 * 5 […]

Automatic configuration backup on Cisco Devices with Archive Command

Use Cisco Archive Command to save Configuration The configuration backup on Cisco Routers and Switches with archive command is very useful for store, organize, restore complete configuration in case of a broken Router and manage an archive of Cisco IOS configuration files in order to enhance the configuration rollback capability by using  the configure replace command if we don’t want changes in configuration. In this example I explained the configuration backup with ftp and tftp servers. In this tutorial I would explain a different method to backup configuration using archive command. It was Introduced in Cisco IOS Release 12.3(4)T and later versions, the archive command permits to save a copy of the current running configuration to different path: ftp, http, https, rcp, scp, tftp servers. Moreover the archive command has other features, but in this article I would use only two of these: time-period: it sets the time increment for automatically […]

How to Use USB to Serial Adapter/Converter for Cisco Console Cable

Now a day new laptops not coming with serial/COM (RS232) port that we need to access and configure the Networking devices using  console port via Hyperterminal  terminal emulator.                 USB to Serial adapter Connection USB to Serial adapter can solve this problem. Using USB to Serial adapter device you can create a serial RS232 port with easy and you can use it to access your cisco console via Hyperterminal. Find the below procedure to connect console port of Cisco device using USB to Serial adaptor via HyperTerminal.                   1. Install USB to Serial adaptor drivers 2. Next check the drivers properly installed for USB to Serial adapter. 3. After Driver software installation, remove the connectivity between Laptop and Router, Reconnect it. You should get “ready to use” message right-hand bottom on your laptop. 4. Next go to the Device […]

Show a Single Interface Configuration on Cisco Router or Switch

This is very useful option to troubleshoot Interface configuration related issues on Cisco Router or Switch. Without this option displaying configuration of a single interface can be a very time-consuming task if your Router has extremely long configuration like 7200 series high-end Router with large number of interfaces, route-maps, access-lists etc. To display or show  single interface configuration, use the interface keyword with show running-config command in Router privilege mode. Open/Show a Single Interface Configuration For example, the show running-config interface serial 0/0/0 command displays only configuration of the specified interface without displaying the whole running configuration Router#show  run int s0/0/0 Building configuration… Current configuration : 149 bytes ! interface Serial0/0/0 description ***Connected To ISP*** ip address 202.120.150.42 255.255.255.252 ip access-group 101 out ip nat outside end Router#