Archive for September, 2011

How to Stack Dell Force10 S60 Switches

Tuesday, September 20th, 2011

Dell Force10 S60 Switch
In this lab I use two Dell Force10 S60 switches [FTOS 8.3.3.4] to demonstrate how to stack two S60 switches together. By stacking the switches you can increase port density and manage the switches together as if it were one large single unit. The stack can be envisioned as one large chassis with the primary management switch as the primary RPM (Route Processor Module), the secondary management switch as the standby RPM, and other member switches as linecards. (more…)

Twitt

Load Balancing with EIGRP

Wednesday, September 14th, 2011

RIP, RIPv2, IGRP, EIGRP and OSPF are all routing protocols that support equal cost load balancing but IGRP and EIGRP can also support unequal cost load balancing. However, unlike IGRP, EIGRP supports VLSM (Variable Length Subnet Masking). Below I use a Cisco 3560G router [IOS Version 12.2(40)SE] to show how you can have EIRGP load-balance across up to 32 links (equal or unequal). By default, EIGRP will provide equal-cost load balancing across up to 4 links. You can disable load balancing by setting the ‘maximum-paths’ to ’1′. (more…)

Twitt

Perl – Get files and directories with the glob function

Wednesday, September 14th, 2011

Recently, as part of a larger Perl application, I had to get all the files and sub-directories of the working directory. Using the built-in ‘glob’ function, I was able to quickly implement a subroutine to do this and also differentiate a file from a directory. In a list context, as demonstrated below, the ‘glob’ function returns a list of file/directory names that match the pattern. I then loop through this list and differentiate a file from a directory and store it in its respective array. Pretty quick and simple! (more…)

Twitt

Setup Telnet Access on Cisco Switches

Monday, September 12th, 2011

This quick lab assumes you already have an IP address for telnet assigned on the Cisco switch. Once that is setup and you are able to ping the IP address, you can setup telnet access on the Cisco switch with the following commands: (more…)

Twitt