Category Archives: Networking

Password Reset on Cisco MDS 9100 Series Fibre Channel Switch

My most recent customer engagement, was to re-use some older hardware as vSphere disaster recovery. The kit includes a EMC Clariion SAN, and two Cisco MDS 9124 switches.

The customer didn’t setup these FC switches, and required a password reset. Which I was happy to do for him, until I realised the Cisco article online is slightly wrong. So below are the steps I took to get the job done.

Password Reset/Recovery Steps

First off stick your console cable into the switch,

1. Power Cycle the Switch and keep pressing Ctrl + C until you see;

loader>

2. You then need to find the boot filename, using the “dir” command

loader> dir bootflash:
bootflash:

 12288 lost+found/
 18678784 m9100-s2ek9-kickstart-mz.4.1.3a.bin
 51055100 m9100-s2ek9-mz.4.1.3a.bin
 4798 mts.log

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Setting up LACP on Synology NAS and HP Switches

Here I am going through how to setup LACP port trunking for a Synology NAS device using HP Switching.

1. First off get your MAC Addresses of your Synology NAS interfaces you want to configure, these can be found in the DSM web login under Control Panel > Info Center > Network

2015-03-02_11-42-38 Continue reading Setting up LACP on Synology NAS and HP Switches

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Revision notes from VMware Network Virtualization Fundamentals Course

VMware released a free course around Network Virtualization Fundamentals, which maps to the first steps on the ladder for all things NSX. It is also recommended by VMware to take the course before taking on the VCA-NV.

I urge anyone looking into NSX to take this course, you can’t argue with the price after all!!! Secondly, although there are many NSX posts online name, Brad Hedlund has some of the best posts in my opinion.

Check the NSX-Link-O-Rama aswell.

And finally, the NSX Compendium over at Network Inferno

Below are my notes I took whilst going through the course.

The Basics
Virtual switch
  • Ports organised into port groups
  • Uplinks connect virtual switch to physical network
  • Connections to support virtual infrastructure

Virtual standard switches – configuration per host, therefore needs to be replicated exactly to all hosts

  • Port groups
  • VMkernel Ports
  • Uplink Ports
  • Policies at virtual switch level can be over-ridden  at port group level
  • VLAN’s set at port group level and VMKernal Port level only
  • No support for things like STP, as virtual switches cannot be connected to one another, nor do they learn MAC addresses.

vsphere-network-standard-switch

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How to produce good documentation – Part 4 – Diagraming a network

So in my last post, I looked at how to record the logical information about your IP addresses and switchport locations, making it easier for troubleshooting in the future.

Now lets tackle the big one, how to produce good documentation when diagraming your network.

For this, I am going to use a real world example of a network I audited, and then made a visio diagram. Personally, I don’t believe this is one of the best visio diagram’s I have produced, however it includes a lot of various parts which I think are useful.

So below, you find the original hand drawn diagram as I was tracing cables and devices, and then the final product.

Note: Unfortunately I do not have the Visio file available for distribution used in this post.

The diagram

original diagramNetwork Diagram

Starting off

Continue reading How to produce good documentation – Part 4 – Diagraming a network

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