From: Dan Shechter (danshtr@gmail.com)
Date: Thu Nov 08 2007 - 15:30:56 ART
I use this concept a lot in my real lab at work (not study lab, its
pre production lab). We have a server farm which is using private
VLAN, but the servers are running in VMWare ESX server, which
obviously got not support for private VLANs.
I place every virtual server in its own VLAN, and connection the ESX
server using dot1q to a cat 3560 switch. The 3560 is connected with
48 RJ cables to the 6500 which is implementing the private VLAN, each
port on the 3560 is an access port with its own VLAN, which is the
server VLAN from the ESX server.
In this example, the 6500 got primary VLAN 10 with isolate VLAN30.
The goal is to place VM1 and VM2 in that isolate VLAN
+--------------b ................ ,______________
| ESX SERVER | | 3560 | | 6500 |
| | | | | |
|............. | | sw ac vl 20 +-------+ pvlan 10 30 |
|| VM1 VLAN20| | DOT1Q | | | |
| `''''''''''' |__________ | | | |
| ............ | | sw ac vl 21 +-------+ pvlan 10 30 |
| |VM2 VLAN21| | | | | |
| '`'''''''''' | | | | |
`..............' |..............| |_____________|
HTH,
Dan Shechter #13685 (R&S / Security)
http://web.mac.com/danshtr
On Nov 8, 2007, at 7:12 , Scott Vermillion wrote:
> Hey Ben,
>
> Well, thanks much for your kind remarks. I forward all credit for
> the USB
> concept to the IE Brians. They're the true genius behind that
> little gem
> (I'm just the sometimes reporter).
>
> Your concept is interesting, to say the least. I'm not a linux
> guy, so I
> guess I have to sit this one out. You may wish to float this to
> the Hacki
> forum. Both the developer of Dynamips and Dynagen are regular
> contributors
> there, so you're likely to get a good response to this proposal.
> http://7200emu.hacki.at/index.php Do let us know what you find out
> either
> via the forum or your own experimentation!
>
> Regards,
>
> Scott
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf Of Ben
> Holko
> Sent: Thursday, November 08, 2007 5:07 AM
> To: ccielab@groupstudy.com
> Subject: Dynamips - real ethernet - why use USB?
>
> Hey all,
>
> There have been several informative posts and topics (thanks Scott V!)
> on using things such as a MAC Mini and USB Ethernet to link your
> Dynamips routers to REAL switches - and I suddenly got to thinking,
> why
> use USB at all?
>
> Why cant we run up 802.1Q sub interfaces in Linux, run a trunk into
> a L2
> 802.1Q switch (say a 2950), and then connect out of the 2950 into our
> REAL 4 x 3550/3560 with one cable per logical router interface (say
> one
> vlan in the 3000 range for each router interface)?
>
> It's basically the same premise as using the 16 x USB Ethernet
> adapters,
> but using an extra switch and 802.1Q subinterfaces on Linux
> instead, to
> break out into one physical cable per Dynamips router interface.
>
> Can you configure Dynamips to map each router interface to a separate
> logical Linux 802.1Q interface? I will be trying it when I get back
> from
> interstate next week.
>
> The reason I got to thinking this, is my Linux Dynamips box (a Dell
> 2650
> PowerEdge) is not liking its USB controller, and it has a second
> 10/100/1000 Broadcom NIC sitting idle - the 5th switch required to
> perform physical interface break-out could be anything that supports
> 802.1Q, doesn't even have to be a Cisco, which would potentially
> make it
> even cheaper than the USB approach!
>
> Any thoughts?
>
> Ben
>
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