STP may cause temporary loss of network connectivity when a failover or failback event occurs (1003804)


In a switched network environment which uses Spanning Tree Protocol (STP), you experience these symptoms:

  • An ESXi or ESX host temporarily loses network connectivity when a failover or failback event occurs.
  • Virtual machines temporarily lose network connectivity when a failover or failback event occurs.
  • A VMware High Availability (HA) isolation event occurs after one of the teamed NICs of the COS is unplugged and plugged in to a different port.


STP is used to accomplish a loop-free environment. Every time a port state goes up, STP calculation occurs. As the result of the calculation, the switch ports are either set to a forwarding or blocking state to prevent a traffic loop. STP topology convergence has four states:

  • Blocking
  • Listening
  • Learning
  • Forwarding

When STP convergence is initiated it forces all of the physical switches in the STP domain to dump their forwarding tables and relearn the STP topology and all MAC addresses. This process can take between 30-50 seconds. During this time, no user data passes through the port. Some user applications can time out during this period. Connectivity is restored when the STP domain completes this convergence.

To prevent the 30-50 second loss of connectivity during STP convergence, perform one of these options:

  • To set STP to Portfast on all switch ports that are connected to network adapters on an ESXi/ESX host
    Portfast allows the ports to immediately be set back to the forwarding state and prevents the link state changes that occur on ESX/ESXi hosts from affecting the STP topology. Setting STP to Portfast prevents the 30-50 second loss of network connectivity.
    The command to set STP to Portfast depends on the model of the switch. As the command is different from model to model and vendor to vendor, c ontact your physical switch vendor for more detailed information on how to configure the same.
    For example:
    To set STP to Portfast on a switch, run the below command based on the switch model:

      spanning-tree portfast (for an access port)
      spanning-tree portfast trunk (for a trunk port)
    • NX-IOS
      spanning-tree port type edge (for an access port)
      spanning-tree port type edge trunk (for a trunk port)
    • To set STP to Portfast on a Dell switch, run the command:
      spanning-tree portfast
    • HP switches use a feature called admin-edge-port, which works the same way as Portfast or RSTP.
      To enable admin-edge-port, run the command:
      spanning-tree port-listadmin-edge-port
  • To disable STP
    VMware does not typically recommend that you disable STP. However, to prevent this issue from occurring, it may be necessary to disable STP. Before you disable STP, contact your switch vendor.
    The command to disable STP depends on the switch. Contact your switch vendor for more detailed information.
    For example:
    To disable STP on a Nortel switch, run the command:
    config ethernet stg stp disable

Taken from :

CentOS 7. Which installer need to Download: Minimal, DVD, or Everything?

Size of CentOS 7 iso. To determine which package that you want to install/download (DVD, Everything, or Minimal).

4.0G CentOS-7-x86_64-DVD-1503-01.iso
7.1G CentOS-7-x86_64-Everything-1503-01.iso
696M CentOS-7-x86_64-LiveCD-1503.iso
1.0G CentOS-7-x86_64-LiveGNOME-1503.iso
1.2G CentOS-7-x86_64-LiveKDE-1503.iso
636M CentOS-7-x86_64-Minimal-1503-01.iso
360M CentOS-7-x86_64-NetInstall-1503.iso

Better to start with minimal, and add package needed with yum install package later on after installation.


Kind Regards,
Doddi Priyambodo

Koleksi Useful Links / Booklet untuk VMware


Berikut ini saya lampirkan koleksi links yang bagus untuk dibaca-baca mengenai VMware.



  •  VMware Products Feature Walkthrough
  •  VMware Knowledgebase:
  •  VMware Documentation:
  •  Security Hardening Guide:
  •  VMware Compatibility Guide:
  •  VMware Product Interoperability Matrixes:
  •  Guest Operating System Installation Guide:
  •  Technical White Papers:
  •  VMware Security Advisories:
  •  VMware Community:
  •  VMware Blog:
  •  VMware Education:
  •  My Learn Portal for Education and certification
  •  Hands on Lab (HOL)
  •  My VMware Portal
  •  Technical Publication Glossary



  •  VMware Software-Defined Data Center
  •  What’s New in VMware vSphere 6 – Performance
  •  Performance Best Practices for VMware vSphere 6.0
  •  vSphere Upgrade Center:
  •  vCenter 6.0 Deployment Guide
  •  vCenter Server 6 Deployment Topologies and High Availability
  •  vCenter Single Sign-On and Platform Services Controller High Availability Compatibility Matrix (2112736)
  •  vCenter Platform Controller Service FAQs
  •  Configuring PSC 6.0 High Availability for vSphere 6.0 using vCenter Server 6.0 Appliance (2113315)
  •  vCenter Server 6.0 Availability Guide
  •  Security of the VMware vSphere Hypervisor
  •  Microsoft SQL Server and VMware Virtual Infrastructure
  •  Best Practices for Performance Tuning of Telco and NFV Workloads in vSphere
  •  Using “esxtop” to Troubleshoot Performance Problems
  •  VMware Horizon View and All Flash Virtual SAN Reference Architecture
  •  Virtualizing Microsoft Applications on VMware Virtual SAN


Business Critical Application Virtualization Guides

  •  Microsoft SQL
  •  Microsoft Exchange
  •  Microsoft Sharepoint
  •  SAP
  •  Oracle
  •  Java



  1.  Official enterprise management blogs
  2.  Official video
  3.  Useful resources
  4.  Solution Exchange
  5.  Hands-on Lab for Management products
  6.  Technical blogs by VMware or customers
    o is world #1 blog for Log Insight. Steven is the Product Architect for Log Insight.
    o by Manny Sidhu, a Virtualization architect working for a global bank.
    o by Sunny Dua, VMware PSO Consultant and CTO Ambassador.
    o by Iwan Rahabok, VMware SE and CTO Ambassador.


Thanks. Semoga berguna.


Kind Regards,

Doddi Priyambodo.

VMware vSphere 6 Public Documentation

Berikut ini adalah dokumentasi resmi mengenai vSphere 6. Bisa di-download langsung dari VMware website.

Silahkan dinikmati : (


ESXi and vCenter Server 6.0 Product Guides
vSphere Installation and Setup [pdf | epub | mobi]
vSphere Upgrade [pdf | epub | mobi]
vSphere vCenter Server and Host Management [pdf | epub | mobi]
vSphere vCenter Server Appliance Configuration [pdf | epub | mobi]
vSphere Virtual Machine Administration [pdf | epub| mobi]
vSphere Host Profiles [pdf | epub | mobi]
vSphere Networking [pdf | epub | mobi]
vSphere Storage [pdf | epub | mobi]
vSphere Security [pdf | epub | mobi]
vSphere Resource Management [pdf | epub | mobi]
vSphere Availability [pdf | epub | mobi]
vSphere Monitoring and Performance [pdf | epub| mobi]
vSphere Administration with the vSphere Client [pdf | epub | mobi]
vSphere Troubleshooting [pdf | epub | mobi]


vSphere Update Manager 6.0 Product Guides
Installing and Administering VMware vSphere Update Manager [pdf | epub | mobi]
Reconfiguring VMware vSphere Update Manager [pdf | epub | mobi]
Sizing Estimator for vSphere Update Manager [xls]
VMware Virtual SAN 6.0 Product Guides
Administering VMware Virtual SAN [pdf | epub | mobi]
vSphere Data Protection 6.0 Product Guides
vSphere Data Protection Administration Guide 6.0 [pdf]
Other Resources for vSphere 6.0
vSphere Management Assistant Guide [pdf]

There are other documents related to vSphere and vCenter. You can google it and eat them all 🙂


– untuk instalasi dan penjelasan vSphere 6, ada blog bagus dari Derek Seaman >>> (


Thank you.


Create your own vSphere 6 Private Lab

It is easy to create the vSphere Lab in your laptop!

These are the steps :

1. Prepare Storage :

EMC Appliance :



NetApp Appliance :



OR use open source NAS server (FreeNAS is easier, OpenFiler, etc)

2. Prepare Gateway, NTP, LDAP/AD, DNS

Create DNS and NTP easily with  this =

LDAP can be created easily with turnkeylinux openldap

3. Prepare vSphere ESXi

4. Prepare vCenter


Kumpulan Knowledge Based penting untuk VMware vSphere 6.0

Saat ini sudah launch beberapa bulan yang lalu vSphere 6.0, tetapi saat ini masih banyak pengguna vSphere yang masih menggunakan versi 5.5. Jadi kumpulan knowledge based ini sangat berguna untuk me-recap apa saja yang KB yang penting untuk versi 5.5 ini.

With this in mind, we have created the following list of Knowledgebase articles that are brand new, or have been updated for vSphere 5.5 You’ll notice lots of best practices KBs here.

The first grouping contains absolute ‘must know’ information, the second grouping gets a bit more into details.

Also not to be missed:

Taken from: