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List:       openvswitch-discuss
Subject:    [ovs-discuss] How to make Open vSwitch a router
From:       derek.cormier () lab ! ntt ! co ! jp (Derek Cormier)
Date:       2010-11-10 7:39:42
Message-ID: 4CDA4C3E.8050500 () lab ! ntt ! co ! jp
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I see. So if I was implementing routing for NOX, one of my components 
could keep track of each bridge IP addresses and treat those as ports on 
the router. But, I suppose the NOX component could just keep track of 
the ports' IPs by itself...

On 11/10/2010 04:06 PM, Justin Pettit wrote:
> On Nov 9, 2010, at 9:06 PM, Derek Cormier wrote:
> 
> 
> > Thanks for your reply Jesse, my comments are inline.
> > 
> > On 11/10/2010 01:31 PM, Jesse Gross wrote:
> > 
> > > On Tue, Nov 9, 2010 at 7:52 PM, Derek Cormier
> > > <derek.cormier at lab.ntt.co.jp>   wrote:
> > > 
> > > 
> > > > *My apologies, the formatting of my diagram got messed up after I sent it. I
> > > > think it still gets the point across thought, vm1 and vm2 are connected to
> > > > br0 and vm3 is connected to br1.
> > > > 
> > > > @Martin: I see. Do you know if anyone has tried this before?
> > > > 
> > > > 
> > > I doubt it.  For one thing, OpenFlow 1.0 doesn't provide the ability
> > > to modify the TTL, so it's not actually possible to create a standards
> > > compliant router, short of sending all packets to the controller.
> > > 
> > Couldn't you modify the contents of the packet with NOX?
> > 
> That's what he meant by sending all packets to the controller.
> 
> 
> > > > Something I'm a bit confused about: When you plug an Ethernet cable into a
> > > > router, the router's NIC has an IP address. In the case of Open vSwitch,
> > > > does that interface correspond to the IP address of the bridge?
> > > > 
> > > > 
> > > Open vSwitch is modeling a switch and switches don't have IP addresses
> > > on their ports.  The IP address of the bridge is essentially a switch
> > > port that is directly attached to the host OS.
> > > 
> > Could you please give an example of when you would need to assign an IP address \
> > to a bridge? 
> 
> If all the ports on your systems are attached to a bridge, then there would be no \
> way to connect to the box if you don't assign an address to the bridge, since the \
> ports can't have IP addresses. 
> --Justin
> 
> 
> 
> 
> 
> 
> 


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