Post Views: 3,818 Everyone knows that constantly entering commands on Cisco routers and switches can become uncomfortably repetitive. To make life somewhat easier, Cisco offers the alias command, which can help dispel part of this repetition. This is a Global Configuration command. To use it, enter the alias command and identify which privilege level you
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Post Views: 3,772 In this How To, we will discuss the clock setting in IOS. When Cisco IOS boots up, the default date and time is set to March 1, 1993. You can view this using the ‘show clock’ command: cell_pe1> show clock *00:01:10.415 UTC Mon Mar 1 1993 It isn’t necessary for a
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Post Views: 4,095 ‘Lines’ are physical async serial ports on the router (such as a terminal or modem), a virtual network connection, or another type of serial line on the router. To see which lines you have on your router, use the show line command: Cell_Router#show lineTty Typ Tx/Rx A Modem Roty AccO AccI Uses
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Post Views: 1,472 In this How To we will reveal how to bypass the system password on Cisco IOS routers. This procedure is used regularly by CellStream consultants. As you will see, we are changing the configuration register to alter the boot process to exclude the configuration files that the router has, as within those
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Post Views: 1,638 Let’s say you’re implementing some changes on a router that has a large configuration file. Maybe something distracted you when you were making the change, but the new feature doesn’t work when you go to test it. You just want to back everything out and start from scratch. How can you do
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Post Views: 2,073 In this How To we will reveal how to bypass the system password on Cisco IOS routers. This procedure is used regularly by CellStream consultants. As you will see, we are changing the configuration register to alter the boot process to exclude the configuration files that the router has, as within those
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Post Views: 2,110 GLBP is a new protocol similar in function to HSRP (discussed here). It has been available since IOS version 12.2(14)S and you can read more at the Cisco site in this article on Gateway Load Balancing Protocol. GLBP and HSRP are both Cisco proprietary solutions, but VRRP is an open standard based
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Post Views: 3,007 This How To explaing how to use Extended Ping and Extended Traceroute options in Cisco IOS. Extended Ping The ping command is just about as simple as it gets when it comes to troubleshooting. Ping is actually ICMP. ICMP sends a encho request to a particular address and, if present, that device
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Post Views: 2,063 In this How To we will discuss the process for backing up and restoring configurations of your Cisco IOS devices. Whenever you have a good working configuration, it is always a good idea to create a backup – I like to call them “golden configurations”. This way, if you make changes that
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Post Views: 1,635 This How To will explain the process to back up your IOS image. Your IOS image is stored as a file in the non-volatile memory of your switch or router. This image file is compressed to reduce its size and reduce the transfer times as much as possible. Before starting the procedure
Post Views: 2,219 In this article I wanted to explain some of the basics of a tool called ‘netcat’. Similar to my article of nmap, we will start simple and add some details as we go. What is Netcat? From the netcat web site: Netcat is a featured networking utility which reads and writes data across
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Post Views: 2,128 While RIP is not used for the ‘real’ Internet routing, and hasn’t been for many years, we often use RIP to do testing as it is so quick and easy to configure the protocol. Also, if you are learning shortest path routing for the first time, RIP is a great place to
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Post Views: 2,662 This How To addresses the method of limiting bandwidth on ports of a Cisco Switch or Router. Why should you limit bandwidth? There are a number of reasons for limiting bandwidth on a Cisco switch Ethernet port. For example, let’s say you work for an Internet service provider in a colocation facility,
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Post Views: 1,970 In our high level overview of QoS we stated that configuring QoS can be complicated. Cisco developed NBAR as the QoS ‘autopilot’ as one solution to this problem. More recently, Cisco has developed something called AutoQoS, which also configures QoS settings for you. You can use AutoQoS to a)create policies based on
Post Views: 2,165 Generic Route Encapsulation is a tunneling technique in IP networking where a received IP packet is re-encapsulated in a second IP header (IP-in-IP) and sent across the network. It is like a Layer 3 VPN but alone it is not a secure VPN. You can encrypt GRE with an encryption protocol such
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