[ovs-discuss] VxLAN in Userspace

Flavio Leitner fbl at sysclose.org
Thu Jun 13 23:15:07 UTC 2019


On Wed, Jun 12, 2019 at 07:18:27PM -0400, Vasu Dasari wrote:
> Thanks Ben. Meanwhile I think I found an bug in OVS 2.9.0 with stale ARP
> entries after a bridge is deleted.
> 
> I ran my tunneling experiment successfully. Used mininet to simulate the
> environment. After quitting the mininet, switch s1 is deleted. But, I still
> see the ARP entries in OVS.

Looks like when route_table_valid is false we also need to 
call tnl_neigh_cache_flush() otherwise you will need to wait
the ARP entry in the cache to expire (15min?) which is quite
a long time.

Do you think you can work on a patch?

> root at mn1:~# ovs-vsctl show
> f6af5f1c-a11c-435f-9b03-7317f364ae48
>     Manager "ptcp:6640"
>     ovs_version: "2.9.0"
> 
> Even thought there is no s1, I still see entries here.
> root at mn1:~# ovs-appctl tnl/arp/show
> IP                                            MAC                 Bridge
> ==========================================================================
> 172.168.1.1                                   02:42:ac:14:00:02   s1
> 172.168.1.2                                   02:42:ac:14:00:03   s1
> 10.0.0.10                                     82:ec:29:c0:bc:ef   s1
> 10.0.0.1                                      d2:54:11:f0:95:df   s1
> 
> 
> Just for completeness, this is what I had to do to fix my configuration.
> 
> Figured out what was wrong with my configuration.
> 
> Modify my bridge s1 to be:
> 
> ovs-vsctl --may-exist add-br s1 \
>     -- set Bridge s1 datapath_type=netdev \
>     -- set bridge s1 fail-mode=standalone \
>          other_config:hwaddr=$(cat /sys/class/net/eth1/address)
> 
> Add the flows:
> ovs-ofctl add-flow s1 "priority=1,in_port=s1-eth1 actions=vxlan"
> ovs-ofctl add-flow s1 "priority=1,in_port=vxlan actions=s1-eth1"
> ovs-ofctl add-flow s1 "priority=0 actions=NORMAL"
> 
> ip addr add 1.1.1.1/24 dev s1
> ip link set s1 up
> ip addr flush dev eth1 2>/dev/null
> ip link set eth1 up
> 
> ovs-appctl tnl/arp/set s1 1.1.1.2 00:00:01:00:00:02

Yeah, that will replace the old entry with the new one.

fbl


> 
> *Vasu Dasari*
> 
> 
> On Tue, Jun 11, 2019 at 6:22 PM Ben Pfaff <blp at ovn.org> wrote:
> 
> > On Tue, Jun 11, 2019 at 03:17:24PM -0400, Vasu Dasari wrote:
> > > I am running into an issue which sounds pretty basic, probably I might be
> > > missing something.
> >
> > I think you're trying to use kernel tools to configure userspace
> > tunnels.  Did you read Documentation/howto/userspace-tunneling.rst?
> >

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