[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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