Show Version is a great command for routers, switches or PIX firewalls. Here is a look at all the things you can verify with the show version command: On Routers Cisco switches PIX firewalls We hope this helps and saves you time finding all this information by putting it in one place! Comments are welcomed […]
Show Version Command in Cisco IOS Read More »
This How To will describe the most common configuration needed for Cisco IOS to create a DHCP (IPv4) server on your switch or router. Before You Start Before you configure the DHCP address pool, you need to: •Identify DHCP options for devices where necessary, including the following: –Default boot image name –Default routers –Domain Name
DHCP Server Configuration on Cisco IOS Routers Read More »
This short and sweet How To explains how to configure the DHCP Client in IOS. This is done using a single command. Go to the interface configuration: Router(config-if)#ip address dhcp Some service providers might ask you to use a client-id and/or a hostname of their own choice. This can be done by adding the following
DHCP Client Configuration on Cisco IOS Routers Read More »
A common question folks ask is “How do you check the bandwidth utilization on a router?” It is a great question and the answer is not as easy as you would expect. There are tools that accomplish this (i.e. NetFlow and there is another mentioned at the end of this page). However, without those tools,
Bandwidth Utilization – How to Check It on Routers Read More »
The Border Gateway Protocol (BGP) allows internal and external networks or autonomous systems (AS’s) to exchange routes. BGP is a path-vector routing protocol, which simply means that its job is to exchange routing information between autonomous systems to find the most efficient path for your data to the Internet. Each BGP router connects to its
Border Gateway Protocol (BGP) Path Selection Read More »
When a router learns multiple routes to a specific network via multiple routing processes (or routing protocols, such as RIP, RIPv2, IGRP, EIGRP, and OSPF), it installs the route with the lowest administrative distance in the routing table. Load balancing is a standard functionality of the router software, and is available across all router platforms.
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 router to have
Clock Setting in Cisco IOS Read More »
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 want to specify
Command Alias Usage in Cisco IOS Read More »
‘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 Noise Overruns Int0
Configuring LINES in Cisco IOS Read More »
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 configuration files is
Reload Procedure to Bypass System Password Read More »
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 that? You have
Rollback Capability in Cisco IOS Read More »
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 configuration files is
Reload Procedure to Bypass System Password in Cisco IOS Read More »
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 send back an
Extended Ping and Extended Traceroute Usage in Cisco IOS Read More »
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 on RFC 3768.
Gateway Load Balancing Protocol (GLBP) in Cisco IOS Read More »
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 cause problems, you
Back Up and Restore Configurations on Cisco IOS Devices Read More »