?
Solved

Unicast v Multicast in Windows 2008 NLB

Posted on 2009-04-04
4
Medium Priority
?
4,519 Views
Last Modified: 2012-05-06
Hi All

I am setting up a Windows 2008 server NLB, and there is the option of setting up the cluster operation mode in Unicast or Multicast.

This is slightly complicated by the fact that both the cluster nodes are virtual servers (Vmware ESX guests) running on the same ESX host, which itself is an HP Blade server connected to our Cisco switches via Virtual Connect modules!

Can anyone advise which option is best in this case - Unicast, Multicast or IGMP Multicast?

Much appreciated!
0
Comment
Question by:kam_uk
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
4 Comments
 
LVL 4

Accepted Solution

by:
blissbear earned 2000 total points
ID: 24069025
The question is best answered by another question.  How many machines are going to need the traffic?

If you only have 2 or 3 machines that will need the data then unicast is fine, as it targets the specified IP addresses directly and can easily migrate acrossed routers.

If you have many machines on the subnet that need access to the data, multicast is useful as it is picked up by every machine on the network and does not need to be sent multiple times, thus reducing the bandwidth overhead on your network.
0
 
LVL 7

Expert Comment

by:kumarnirmal
ID: 24070271
I agree with blissbear, the cluster operation mode depends on the type of Application which the Cluster hosts.
0
 
LVL 3

Author Comment

by:kam_uk
ID: 24071237
This is for an IIS SMTP cluster, which will be used by about 100 machines?

What does unicast/multicast actually mean in layman's terms?
0
 
LVL 4

Expert Comment

by:blissbear
ID: 24075903
unicast is traffic that is sent to one IP address.  multicast is a special method of sending data on a LAN that allows you to send it to ALL of the addresses in a subnet.

So, for instance wanted to say, send a video stream to every machine on a LAN, you could do it using multicast technology and every machine would get the data and it would only have to be sent once, thus minimizing the bandwidth usage on the network.
0

Featured Post

Is Your AD Toolbox Looking More Like a Toybox?

Managing Active Directory can get complicated.  Often, the native tools for managing AD are just not up to the task.  The largest Active Directory installations in the world have relied on one tool to manage their day-to-day administration tasks: Hyena. Start your trial today.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

When rebooting a vCenters 6.0 and try to connect using vSphere Client we get this issue "Invalid URL: The hostname could not parsed." When we get this error we need to do some changes in the vCenter advanced settings to fix the issue.
I was prompted to write this article after the recent World-Wide Ransomware outbreak. For years now, System Administrators around the world have used the excuse of "Waiting a Bit" before applying Security Patch Updates. This type of reasoning to me …
This tutorial will give a short introduction and overview of Backup Exec 2012 and how to navigate and perform basic functions. Click on the Backup Exec button in the upper left corner. From here, are global settings for the application such as conne…
This tutorial will walk an individual through the steps necessary to enable the VMware\Hyper-V licensed feature of Backup Exec 2012. In addition, how to add a VMware server and configure a backup job. The first step is to acquire the necessary licen…

718 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question