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 Post subject: Re: Setting up a breakout switch on MAC
PostPosted: Mon Apr 22, 2013 3:07 pm 
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Joined: Sat Mar 23, 2013 7:01 am
Posts: 14
mtg/Jason,

I finally got a solution for my breakout switch on MAC OS X. I bought a USB-to-Ethernet adapter from Startech. The product number is USB31000SW. This was able to set the MTU size of my desktop on that usb port to more than 1500. Then I used the breakout switch approach so that I don't have to buy many of those cables and a usb hub. That approach allows vlan tagging and jumbo frames.
I have tried it using the method described on this link http://www.gns3.net/switching-qinq-with ... ch-option/.


It worked!!!

Now am gonna set up my full CCIE R&S lab by this weekend and will let you know if there's a new issue.

Thanks,
danviera2002




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 Post subject: Re: Setting up a breakout switch on MAC
PostPosted: Mon Apr 22, 2013 4:29 pm 
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Joined: Tue Jul 17, 2012 1:34 pm
Posts: 214
danviera2002 wrote:
mtg/Jason,

It worked!!!
Now am gonna set up my full CCIE R&S lab by this weekend and will let you know if there's a new issue.

Great job! Keep us posted on the R&S Lab.

-Jason

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J.Neumann, GNS3 Contributor & Forum Moderator (Minion ID: sin.zx81.1981ad)
Author: Cisco Routers for Small Business (Apress)


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 Post subject: Re: Setting up a breakout switch on MAC
PostPosted: Tue May 07, 2013 3:10 am 
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Joined: Tue Jul 17, 2012 1:34 pm
Posts: 214
Quote:
The product number is USB31000SW. This was able to set the MTU size of my desktop on that usb port to more than 1500. Then I used the breakout switch approach so that I don't have to buy many of those cables and a usb hub.

@danviera2002

Thanks a lot for the tip!

I picked up the StartTech USB31000SW adapter and it works VERY well (I tested it on multiple Macs). The adapter not only supports the jumbo frames that are needed for a breakout switch, but even better yet it allows you to configure a standard 802.1Q trunk from a GNS3 Etherswitch router to an external Cisco switch using OS X Mountain Lion. Examining the frames with Wireshark shows that all the tags remain in place between OS X and the physical switch. I downloaded the latest drivers from the StartTech website.

USB31000SW Tech Specs:
    Full Gigabit bandwidth support, through a USB 3.0 host connection
    Highly portable design, with no need for an external power adapter
    Added flexibility near the RJ45 port through Dongle-style design
    Full Gigabit bandwidth support over USB 3.0
    IEEE 802.3, 802.3u and 802.3ab (10BASE-T, 100BASE-TX, and 1000BASE-T) compatible
    Crossover Detection & Auto-Correction (Auto MDIX)
    IEEE 802.1Q VLAN Tagging support
    USB-Powered

I configured an 802.1Q trunk from an Etherswitch router to my C3550 and did some extensive testing- trunking worked very reliably. The nice thing about this approach is that you don't need an additional switch (the breakout switch) when you trunk to your live Cisco gear.

In Mountain Lion (10.8.3) you still have to go through a bridged tap interface in your cloud but that's a small price to pay to be able to trunk to live gear. Finally we can trunk in Mountain Lion!

# Here's how to create a bridge (replace en3 with your adapter's interface name).
Code:
sudo ifconfig bridge0 create
sudo ifconfig bridge0 addm tap0 addm en3
sudo ifconfig bridge0 up


Thanks again for the tip - it works.
-Jason



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Author: Cisco Routers for Small Business (Apress)


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