Solved

Max devices in broadcast domain

Posted on 2013-06-06
3
447 Views
Last Modified: 2013-06-21
Hi

I know there is no hard fast figure for this but can any one give me some guidance on how many device I should have in a broadcast domain?

Currently I subnet everything as /24's but I've been asked to simplify things (there are no problems, just a nob that cant figure out routeing).  This would create a /21 wit over 500 devices in

Many thanks


Brasso
0
Comment
Question by:brasso_42
[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
3 Comments
 
LVL 1

Accepted Solution

by:
JoPeLo earned 250 total points
ID: 39225371
Well, there is not a single answer to your question and you will always get a "it depends"!

Large broadcast domains are sometimes needed in some cases. However, as you probably know, as you increase your broadcast domain, you increase your "problem area" in terms of layer 2 loops, for example. Also, your broadcast traffic will also be spread over that domain.

You can get some advantages with large broadcast domains:
- saves in the IP addressing
- switched faster. If your traffic is mostly local (within the same subnet), it does not need to be routed

However, there are lots of disadvantages. On top, if you are going to have that big broadcast domain over several switches, the STP: spanning tree is the protocol you must rely to keep that large broadcast domain loop free. Do you rely on it? I don't! :)
Besides, if you want to enforce network policies (security), it will be harder and many more hosts will receive that unwanted broadcast traffic that it is not target to it.
 
The great thing of keeping small broadcast domains is layer 2 fault-isolation and security: keep different things separated and protected.

It's up to you.

Hope it helps,
JPL
0
 
LVL 9

Assisted Solution

by:DanJ
DanJ earned 250 total points
ID: 39225396
My suggestion is look at the devices and at the OS you will be running.
All the address tables are limited - HW and/or SW limited.
Ensure that your gear can hold all the MAC entries and the (e.g. router, firewall, load balancer) depending on what is your default next hop.
Also there are limits on the OS on the arp cache and you need to tune them for larger L2 domains .
0
 
LVL 1

Author Closing Comment

by:brasso_42
ID: 39265170
Many t6hanks for your comments
0

Featured Post

Enroll in June's Course of the Month

June's Course of the Month is now available! Every 10 seconds, a consumer gets hit with ransomware. Refresh your knowledge of ransomware best practices by enrolling in this month's complimentary course for Premium Members, Team Accounts, and Qualified Experts.

Question has a verified solution.

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

#Citrix #Citrix Netscaler #HTTP Compression #Load Balance
As companies replace their old PBX phone systems with Unified IP Communications, many are finding out that legacy applications such as fax do not work well with VoIP. Fortunately, Cloud Faxing provides a cost-effective alternative that works over an…
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…

729 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