[talk] vxlan interfaces

[Charles Sprickman]

On Aug 15, 2015, at 10:05 AM, Jesse Callaway <bonsaime at gmail.com> wrote:

> 
> On Sat, Aug 15, 2015 at 8:50 AM, Jesse Callaway <bonsaime at gmail.com> wrote:
> 
> On Fri, Aug 14, 2015 at 2:52 PM, Pete Wright <pete at nomadlogic.org> wrote:
> noticed this addition to FreeBSD in the 10.2-RELEASE notes yesterday:
> 
> "The vxlan(4) driver has been added, which creates a virtual Layer 2 (Ethernet) network overlaid in a Layer 3 (IP/UDP) network. The vxlan(4) driver is analogous to vlan(4), but is designed to be better suited for large, multiple-tenant datacenter environments. [r284365]"
> 
> https://www.freebsd.org/cgi/man.cgi?query=vxlan&apropos=0&sektion=4&manpath=FreeBSD+10.2-RELEASE&arch=default&format=html
> 
> This looks pretty interesting to me and it looks like this is supported by Cisco (as well as other switch vendors probably too).  Has anyone on the list used this in production?
> 
> I'd love to hear some use-cases - I can think of it being useful in the virutalization world (amazon VPC for example).
> 
> cheers!
> -pete
> 
> 
> -- 
> Pete Wright
> pete at nomadlogic.org
> 
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> 
> I wonder if this is the sauce AWS uses/invented.
> 
> -- 
> -jesse
> 
> Looking over it.. .and I don't know how I missed your last sentence there. The RFC was drafted by engineers employed at Cisco, Arista, Broadcom, RedHat, Vmware, and Citrix. I'm pretty sure that this is what the VPC's use from how the Amazon sales engineers explained it. This is also how I got the impression that they invented it, but what was said was actually that "we had to write our own code for a custom solution”.

It’s crazy stuff:

"The vxlan interface encapsulates the Ethernet frame by prepending IP/UDP and vxlan headers.
 Thus, the encapsulated (inner) frame is able to transmitted over a routed, Layer 3 network to	
 the remote host.”

Sounds very similar to Ethernet over IP found in Mikrotik routers.

The bummer is that even though vxlan tunnels over IP, you can’t make use of it outside the datacenter since it wants (requires?) jumbo frames to fit all the extra prepends on the encapsulated ethernet frame.  Regardless, it’s certainly nifty.

Charles


> 
> -- 
> -jesse
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