From: Scott Morris (swm@emanon.com)
Date: Sun Feb 11 2007 - 21:18:06 ART
A long time ago the number of stations on a segment was said to max out at
500'ish. Your mileage may vary on this. That statistic came before full
duplex and switches made life easier. But it also came before the sheer
quantity of babbling from M$ and applications came to suck your network
away.
The ideal size of a VLAN is honestly based more upon the applications and
type of usage that you will have on it (not to mention what OS and how
well-administered things are!)... That takes time to evaluate.
As for the mixing of subnet masks... Well... What happens when you try to
reach someone on your own subnet? You arp. What about someone off subnet?
You go to your gateway. So with mixing subnet masks you're going to make
your gateway do LOTS of work in moving packets in/out the same interface.
You may also get a ton of ICMP messages bitching about that.
As always, your call, but not likely one I'd recommend to anyone! :)
The bottom line though is to know your own network down to the desktop.
Business drivers will likely answer these questions better than anyone's
technical recommendation of 'optimal' or 'max' numbers to use.
YMMV,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE
#153, CISSP, et al.
CCSI/JNCI-M/JNCI-J
IPexpert VP - Curriculum Development
IPexpert Sr. Technical Instructor
smorris@ipexpert.com
http://www.ipexpert.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
network freek
Sent: Sunday, February 11, 2007 5:22 PM
To: ccielab@groupstudy.com
Subject: BD Size
Hi there,
Our network grow fast here. And need break broadcast domains (BDs) into
smaller pieces. We are planning breaking all BDs by implementing VLANs. I
read somewhere that the max number of end stations in one broadcast domain
is ideally (or optimally?) 500. Shouldn't this mean that when creating VLAN
the subnet should be not more than /24?
If in a subnet /24, an end station is set to other than /24, say /16, what
would be the impact to the performance of the end station and to the
network? What if another end station is set to /25 for example?
This archive was generated by hypermail 2.1.4 : Thu Mar 01 2007 - 07:38:46 ART