If I understand you correctly you prefer a s/w virtual environment (VM)
that can simulate multiple switches; doing "trunking (802.1 ?)" and
"switch access ports". Maybe preferably if this was akin to a Cisco
switch with its breadth of IOS command; which probably do exist as a
proprietary tool for in-house Cisco developers.
Well, I've done something similar if not exact to the summary above for
a training lab for firewall simulation. Here is my setup:
hw:
* x86 Dual Xeon 2.6 Ghz / 4Gb RAM / 200 Gb HDD
sw:
+ (Virtualization Sw) Xen 3.3.1 running on CentOS 5.3
+ fed (1) 802.1q trunk (with 16 Vlans) from upstream Cisco3750 switch
* (16) VMs running Ubuntu 9.04 that acts as end hosts per Vlans
and broadcast domain
+ fed (2) "switch access ports"
* (1) for mgmt of Host VM (CentOS 5.3)
* (1) for another guest VM (Ubuntu 9.04)
The net effect is that the Xen environment "acts" like a switch if fed
with 802.1q trunk. I'm sure there are more elegant ways of doing what
you ask, but this setup works pretty effectively for my needs.
Good luck.
Regards,
Ge Moua | Email: [email protected]
Network Design Engineer
University of Minnesota | Networking & Telecommunications Services
Holemans Wim wrote:
I'm looking for a (free) network simulator that allows me to simulate a
small network (20 switches) with different vlans on it. I want to test
different scenario's : what happens if this switch goes down or that
link goes down, how do the packets flow in each scenario for the
different vlans...
Anyone has a good reference to such a product ? Free would be nice but
is no absolute condition.
Thanks,
Wim Holemans
Netwerkdienst Universiteit Antwerpen
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