[ovs-dev] [ovn] howto? L3 support in HW VTEP

Numan Siddique numans at ovn.org
Fri Jun 18 18:27:39 UTC 2021


On Fri, Jun 18, 2021 at 7:42 AM Vladislav Odintsov <odivlad at gmail.com> wrote:
>
> Hi all,
>
> I’m trying to implement support for L3 routing between OVN and HW VTEP devices.
> In my setup I use Cumulus Linux-managed Mellanox SN2000 switches.
> Current L2 functionality in this setup works well: ovn-controller-vtep and a
> small python service on the switch (which installs necessary mcast_macs entries
> in switch fdb, since Cumulus Linux vtep support is limited to service_node
> replication mode).
>
> My logical topology for L3 setup:
>
> 2 logical_switches connected to same logical_router:
> Net1: 192.168.1.0/24, gw ip (lrouter): 192.168.1.1, VM 192.168.1.2
> Net2: 192.168.2.0/24, gw ip (lrouter): 192.168.2.1, Physical host 192.168.2.2
>
> Net1 has attached logical_switch_port with type vtep. In Net2 there is a VM
> (192.168.2.2/24), which needs ip connectivity to physical host (192.168.1.2/24)
> connected to HW VTEP Mellanox switch over vtep lport from Net1.

I'm a little confused.  Above you said the physical host has IP
192.168.2.2 but you also
mentioned there is a VM (192.168.2.2/24).

So in Net2 is there a logical switch port with IP 192.168.2.2 (and the
corresponding VIF)
and it wants to ping to a physical host 192.168.1.2 ?

Maybe you can share the ovn north db to better understand the problem ?

Thanks
Numan


>
> For Net1’s LRP (192.168.1.1) I’ve created chassis_redirect port_binding to some
> Chassis and patched controller-step code so that such CR LRP’s MAC is also
> added to Ucast_Macs_Remote vtep table.
> Traffic from ovn-host to vtep (192.168.1.2 to 192.168.2.2) passes well, but in
> reverse direction physical server sends to all ovn-hosts ARP request Who has
> 192.168.2.1? tell 192.168.2.2. But no answer. If I manually configure arp on
> this physical server, connectivity between VM and physical host works well!
>
> Now I’m stuck with arp resolution for LRP from VTEP lport from OVN side. Can
> somebody give an idea how to make ovn-controllers answer such ARP request?
>
> Thanks.
>
> Regards,
> Vladislav Odintsov
>
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