netdev - RE: VxLAN support question

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Date:	Thu, 13 Aug 2015 00:38:30 +0000
From:	Andrew Qu <andrew.qu@...iatek.com>
To:	Alexei Starovoitov <ast@...mgrid.com>,
	David Miller <davem@...emloft.net>
CC:	"tgraf@...g.ch" <tgraf@...g.ch>,
	"jesse@...ira.com" <jesse@...ira.com>,
	"pshelar@...ira.com" <pshelar@...ira.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: VxLAN support question

Hi Alexei,

I run into following issue:

root@...server:/home/andrew# ip li add vxlan0 type vxlan id 42 remote 171.1.1.1 local 170.1.1.1 dev eth1
====> OK

root@...server:/home/andrew# ip li add vxlan1 type vxlan id 42 remote 172.1.1.1 local 170.1.1.1 dev eth2
==> RTNETLINK answers: File exists

Do you know why Linux kernel reject second CLI ?

>From user perspective,  it is a perfect fine configuration because I want to create two P2P vxlan 
Tunnels to connect TWO VTEPs using same VNI.

Thanks,

Andrew

root@...server:/home/andrew#
-----Original Message-----
From: Alexei Starovoitov [mailto:ast@...mgrid.com] 
Sent: Monday, August 10, 2015 10:37 PM
To: Andrew Qu; David Miller
Cc: tgraf@...g.ch; jesse@...ira.com; pshelar@...ira.com; netdev@...r.kernel.org
Subject: Re: VxLAN support question

On 8/10/15 4:47 PM, Andrew Qu wrote:
>
> Pretty much what I want is that  kernel will have about 1K interfaces 
> (something like Tunnel100.1-tunnel100.1000 To be created and attached 
> to 1K bridge domains on which each VNI is associated with given VNI to 
> bridge-domain will be assigned using other CLIs)

creating 1k vxlan devices is doable, but you probably want to take a look at recently added metadata mode of vxlan.
Also sounds like for each vni you'd need a different multicast group?
What fabric going to support that?

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