What is SFP port? SFP means small form-factor pluggable it is used in network and storage devices and is a hot swappable interface that connects fibre or RJ45 cables between switches and the network. In the picture above you can see two SFP ports one sfp in switch. SFP+ Modules In 2006, SFP+ specification brought speeds up […]
Cisco Nexus 9000 Software Upgrade NX-OS Tutorial
Nexus 9000 software upgrade using my AirConsole Bluetooth Wireless Console Cable Each Nexus 9000 switch is shipped with Cisco NX-OS software. The NX-OS software consists of one NXOS image. The image begins with “nxos” e.g Software BIOS: version 07.59 NXOS: version 7.0(3)I2(5) BIOS compile time: 08/26/2016 NXOS image file is: bootflash:///nxos.7.0.3.I2.5.bin NXOS compile time: 1/13/2017 […]
The Remote System Refused the Connection – Cisco Router SSH
When trying to SSH to a Cisco Router or Switch you get this error The remote system refused the connection This can be caused by a number of reasons The transport setting on the vty lines is not permitting SSH You do not have SSH enabled An Access-List is blocking SSH traffic Lets look at […]
Cisco 2960x Password Recovery Procedure
This short post details how to perform password recovery on a Cisco 2960X switch. Follow these simple steps to reset password. The biggest problem most people have with doing a password recovery on a 2960 or 3560 is knowing how long to hold the mode button down for. The process is very simple: STEP 1: […]
Password Recovery Cisco Catalyst 3850
If you are locked out of your 3850 switch and need to perform Password recovery on a Cisco Catalyst 3850 switch this short tutorial will guide you along the way. You will need One Cisco Catalyst 3850 switch or switch stack which you have forgotton or do not know the password for. A laptop with […]
How to Upgrade Software on Cisco 5508 HA WLC
The process to upgrade a Cisco Wireless Lan Controller is quite straightforward but there are a few things you need to be aware of which can minimise the downtime for your wireless network. This guide will go through the process to upgrade a pair of 5508 WLC’s configured in HA setup and connected back to […]
Cisco Commerce Workspace – Quick Tutorial
The Cisco Commerce Workspace (CCW) is a multipurpose tool for Cisco Partners and empolyees to quickly create a Bill of Materials with list price quotes. To access the Cisco Commerce Workspace go to http://www.cisco.com/go/ccw You should see a screen like this To create a quote click on the Estimates & Configurations The first thing you should […]
How to Upgrade IOS on Cisco 4500X Switch
The post describes the process of how to upgrade the IOS / Software on a Cisco 4500X switch. I will not be covering how to do a hitless upgrade using ISSU with 2 switches in a VSS pair. This process is performed on two switches which are not in production. So to perform the upgrade […]
Spanning-Tree Portfast – The Definitive Guide
The spanning-tree portfast command is a very simple feature but often mis-understood. In this short post I will explore how this feature behaves, how it works and how to configure it on a cisco switch. Portfast is a Cisco Propietary feature that was originally developed to overcome an issue when a PC was trying to […]
How to upgrade software on a Cisco 3850 Switch
Do you want to perform a Cisco 3850 IOS Upgrade? This short post will show you how to upgrade the software on a single Cisco 3850 switch or a 3850 stack, using TFTP and USB. The Cisco 3850 IOS upgrade procedure is very easy but it is a bit different than the usual software image […]
Private Vlans Explained
Introduction to Private Vlans A normal Vlan is essentially a broadcast domain and all the devices if addressed on the same subnet can communicate with each other. In shared hosting environments, to save on IP address space and Vlans it would be great if you could isolate devices within the same vlan and prevent them […]
What Cisco did for London 2012
Here are some amazing facts from Cisco about what they supplied to power the network for London 2012 Cisco Key Facts Cisco’s Delivery to London 2012 94 Sites 1800 Wireless Access Points 16500 IP Telephones 65000 Active Connections 80000 Data Ports For more info you can go here – http://www.ciscolondon2012.co.uk/
Switchport Host Command
Working through one if the INE workbooks today I discovered a switch command I had never come across before switchport host Normally I would enable spanning-tree portfast on all access ports to ensure they come up quicker, and also set them to access ports. This command does 3 things! Configures the switchport for access mode […]