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NEXUS NX-OS: Useful Commands, CLI Scripting, Hints & Tips, Python Scripting and more

Posted in Cisco Data Center

NEXUS NX-OS: Useful Commands, CLI Scripting, Hints & Tips, Python Scripting and more - 4.9 out of 5 based on 16 votes

cisco nexus configurationWhether you’re new to Cisco Nexus switches or have been working with them for years this article will show how to get around the Nexus NX-OS using smart CLI commands and parameters, create your own commands and more. Learn how to filter show command outputs, efficiently use include | begin | exclude search operators, Turn pagination on/off, redirect output to files, run multiple commands in one CLI line, capture specific keywords from show command output,  create custom CLI commands using alias, execute scripts, introduction of Python environment in the Nexus NX-OS, executing Python scripts and much more!

By the end of this article we’ll agree there’s no doubt the Cisco NX-OS has several interesting commands and powerful scripting capabilities that can improve and facilitate the day-to-day administration of CISCO Nexus network devices.  

While basic knowledge on the Cisco NX-OS, Linux and Python scripting is recommended, it is not mandatory in order to understand the topics covered.

Here’s a list of topics covered:

Additional related articles:

NX-OS Command Output Filtering – Search Operators

cisco nexus cli commands tips tricksThe output from NX-OS show commands can be lengthy and that makes it difficult to find the information we are looking for. The Cisco NX-OS software provides the means to search and filter the output to assist in locating the information we are after. 

Experienced Cisco users will surely be familiar with the IOS (Catalyst) include | begin | exclude search operators which are also offered in the Nexus NX-OS (see below). The NX-OS offers additional searching and filtering options, which follow a pipe character (|) at the end of the show command. This provides amazing flexibility and helps make administration of any Nexus device a great experience. The most “Linux-like” useful options are displayed below:

N5k-UP# show interface brief | ?
<…>
diff  Show difference between current and previous invocation (creates temp files: remove them with 'diff-clean' command and dont use it on commands with big outputs, like 'show tech'!)
egrep  Egrep - print lines matching a pattern
grep  Grep - print lines matching a pattern
less  Filter for paging
no-more  Turn-off pagination for command output
section   Show lines that include the pattern as well as the subsequent lines that are more indented than matching line
sort    Stream Sorter
source   Run a script (python, tcl,...) from bootflash:scripts
vsh   The shell that understands cli command
wc   Count words, lines, characters
xml   Output in xml format (according to .xsd definitions)
begin   Begin with the line that matches
count   Count number of lines
exclude   Exclude lines that match
include   Include lines that match 

Filtering Output From The ‘Show’ Command - ‘Show <command> | grep’ & ‘Show <command>egrep’ Parameters

Free Webinar: Migrating from Hyper-V to VMware

Posted in Windows Server 2016

Free Webinar: Migrating from Hyper-V to VMware - 5.0 out of 5 based on 1 vote

hyper-v vmware migration webinarIf your organization is planning to migration from a Hyper-V virtualization environment to VMware then this FREE webinar is just for you.

Aimed toward Hyper-V and VMware admins this webinar will cover critical topics such as:

  • vSphere basics and a crash course in HA, DRS, and vMotion
  • Management differences between vSphere and Hyper-V
  • How to migrate VMs from Hyper-V to VMware using the VMware vSphere Converter

The entire session will be geared towards Hyper-V admins who are looking to broaden their horizons by adding VMware know-how to their toolbox.

Webinar Date: Tuesday, June 27th 2017

Time: Time for US attendees: (10am PDT / 1pm EDT), Time for EU attendees: (2pm CEST)

Click here to register for this FREE Webinar

Best VPN Review: StrongVPN. Download Speed Τest, Torrenting, Netflix, BBC, HULU, DNS Leak Test, Security, VPN Options, Device Support and more

Posted in Best VPN Reviews

Best VPN Review: StrongVPN. Download Speed Τest, Torrenting, Netflix, BBC, HULU, DNS Leak Test, Security, VPN Options, Device Support and more - 5.0 out of 5 based on 4 votes

strongvpn top ratedStrongVPN is one of the most popular VPN service around the world. With a presence in over 23 countries,+650 servers, cheap prices, Strong Encryption and blazing fast download speeds – it rightfully deserves the No.1 position in our Best VPN Review.

This in-depth review took weeks to write as we performed extensive testing on workstations and mobile clients, downloading, VPN torrenting, performing security tests, VoIP & Video latency, gaming and more, in an attempt to discover any flaws, issues or limitations the VPN service might have. Here’s what we’ve tested and reviewed for our readers: 

Without any further delay, let’s take a look and see what StrongVPN was able to deliver during these very challenging tests!

Positives:

  • Ranked No.1 in our Best VPN Service review
  • Superfast Download/Upload Speeds supporting Torrents
  • Very low Latency
  • Strong Encryption
  • Zero-Log Policy
  • Effective DNS Leak, IP Leak & WebRTC Protection
  • Cheap for 12 month signup plans 

Concerns:

  • Kill-switch
  • 5 day money-back guarantee period

Visit StrongVPN

Overview 

StrongVPN is one of the oldest in the industry, beginning as a humble PC company in 1994. A subsidiary of Reliable Hosting, the company was created after a move to San Francisco prompted the sale of VPN services.

The US-based company doesn’t promise a whole lot on its website, but under the hood it’s a fast VPN with a no-log policy and great customer service. It supports 5 concurrent connections for $10 per month, or just $5.83 a month if you opt for a yearly package.

While some of the best VPNs focus on a wide range of servers, StrongVPN prioritises speed and the ability to unblock Netflix. It has servers in 45 cities across 23 countries, most of which can bypass region blocks.

Such functionality has made this StrongVPN very popular in China and other countries with aggressive blocking policies. This review will analyze the benefits for a new, global audience.

Ease of Use – StrongVPNGUI Interface

StrongVPN’s install is as simple as it gets. Users are presented with a regular installer and just have to hit next until it’s complete. StrongVPN intelligently installs TAP drivers, requiring no extra prompts. After completion, the application will launch automatically.

At first glance, StrongVPN’s interface is simple. It presents your location, a list of servers, and VPN protocol used to encrypt traffic. Most users will never have to go outside of this interface, leaving a minimal, simple experience.

The StrongVPN client - Probably not the best looking GUI but surely the best service

The StrongVPN client - Probably not the best looking GUI but surely the best service

Once you drill down into settings, things get more complex. Though well-labelled, there’s a lot of information with no tooltips or tutorial. However, these are presented as advanced options so, naturally, they are targeted at power users.

3CX Unified Communications New Web Client IP Phone, Web Meetings, Click-to-Call & More with V15.5

Posted in IP PBX - Unified Communications

3CX Unified Communications New Web Client IP Phone, Web Meetings, Click-to-Call & More with V15.5 - 5.0 out of 5 based on 1 vote

3cx video conferenceThe developers of the popular software PBX, 3CX, have announced another major update to their unified communications solution! The latest release, 3CX v15.5, makes the phone system faster, more secure and more reliable with a number of improvements and brand new features. 

 Notably, v15.5 brings with it a totally new concept for the PBX system, a completely web-based softphone client that can be launched straight from any open-standards browser. The web client has an attractive, modern interface which makes it incredibly user-friendly, allowing tasks such as call transferring, deskphone control and more to be carried out in a single click.

3CX’s Web-Client provides leading features packed in an easy-to-use GUI

3CX’s Web-Client provides leading features packed in an easy-to-use GUI

Download Your Free 3CX IP PBX Now!

Unified Communications IP PBX That Can Be Deployed Anywhere

Furthering their commitment to providing an easy to install and manage PBX, 3CX has also made deployment easier and more flexible. 3CX can be deployed on MiniPC appliances of leading brands such as Intel, Zotac, Shuttle and Gigabyte meaning that businesses on a budget can ensure enterprise level communications at a fraction of the price.

Additionally, 3CX has ensured more freedom of choice when it comes to deploying the PBX in the cloud. With more supported hosters, such as 1&1, and an easy to use 8 step wizard that allows customers and resellers to have a fully configured PBX up and running in minutes. 

IP PBX with Integrated Web Conferencing

The brand new web client includes integrated web conferencing completely free of charge without any additional licensing or administration. Video conferences are held directly from the browser with no additional downloads or plugins, and most importantly, this applies to remote participants as well!

3CX: IP PBX Web Client with integrated Web Conferencing Free of Charge!

3CX: IP PBX Web Client with integrated Web Conferencing Free of Charge!

More Reliable, Easier to Control Your Deskphone or Smartphone

By implementing the uaCSTA standard for deskphones, 3CX has significantly improved remote control of phones. This has ensured more reliable control of IP phones regardless of the location of the extension or whether or not the PBX is being run on-premise or in the cloud. Moreover, the 3CX smartphone clients for Android and iOS can now also be remote controlled.

3CX’s Click-to-Call Feature from any Web page or CRM

3CX’s Click-to-Call Feature from any Web page or CRM

Additional Improvements & Features Include:

  • Click2Call Chrome Extension to dial from any web page or CRM
  • Integrated Hotel Module
  • Support for Google Firebase PUSH
  • Achieve PCI compliance in financial environments

Find out more about v15.5 and try it out today for FREE by heading over to the 3CX website.

Complete Guide to Nexus Checkpoint & Rollback Feature. Fast Recovery from Nexus Misconfiguration. Nexus 9000, 7000, 5000, 3000

Posted in Cisco Data Center

Complete Guide to Nexus Checkpoint & Rollback Feature. Fast Recovery from Nexus Misconfiguration. Nexus 9000, 7000, 5000, 3000 - 5.0 out of 5 based on 13 votes

cisco nexus configuration checkpoint rollbackThe Cisco NX-OS checkpoint feature provides the capability to capture at any time a snapshot (backup) of the Cisco Nexus configuration before making any changes. The captured configuration (checkpoint) can then be used to roll back and restore the original configuration.

The NX-OS checkpoint and rollback feature is extremely useful, and a life saver in some cases, when a new configuration change to a production system has caused unwanted effects or was incorrectly made/planned and we need to immediately return to an original/stable configuration.

With Catalyst IOS switches we would manually remove or restore IOS commands but with the Nexus NS-OS checkpoint-rollback feature this is a much faster and safer process that can be executed even by an authorized user with basic experience/knowledge on Nexus switches.

Let’s take a quick look at the topics covered in our article:

Finally, we must point out that basic knowledge of the Cisco NX-OS is required for this article.

Additional Reading:

Readers can also refer to our for more information on Nexus switches. 

NX-OS Checkpoint & Rollback Limitations - Guidelines

The Checkpoint and Rollback feature has the following main configuration guidelines and limitations:

  • The maximum number of checkpoints supported is equal to ten (10).
  • Checkpoints are stored in an internal repository not accessible by the common user.
  • Checkpoints are persistent and synced between redundant supervisors.
  • It is not possible to apply or import the checkpoint file from another Nexus switch. Checkpoints can only be used on the device they were created on.
  • Only one user at a time can perform a checkpoint, rollback, or copy of the running configuration to the startup configuration.
  • Checkpoints are cleared from the system’s database after executing the write erase or reload command (switch reload).
  • Checkpoints can be manually cleared by running the clear checkpoint database command. The checkpoints saved to the bootflash are not affected by the aforementioned commands.
  • Checkpoints are only local to the NX-OS switch.
  • Rollback using files stored in bootflash is supported only if it has been created using the checkpoint command.
  • Checkpoint names must be unique. You cannot overwrite previously saved checkpoints. If attempting to overwrite existing checkpoints the user will receive the following error: ERROR: ascii-cfg: Checkpoint Name already exists (err id 0x405F002B)
  • Checkpoints are local to a virtual device context (VDC) for the Nexus 7000.
  • Rollback is not supported in the storage VDC for the Nexus 7000
  • Rollback is not supported on the Nexus 5000 after enabling the FCoE feature. System will generate the following error after enabling the FCoE feature: ERROR: FCOE is enabled. Disabling rollback module.

Understanding and Configuring the NX-OS Checkpoint Feature

Working with the Nexus Checkpoint feature is a very easy process and the commands used follow a logical order allowing the easy usage of this fantastic feature.

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