Hi, The https://review.openstack.org/#/c/237820/ patch added the support for adding router interfaces in OVN NB. This patch only provides support for a single route per interface. Neutron supports multiple routes per router interface. While attempting to model this in OVN Northbound DB, I ran into some problems.
The OVN Northbound DB at this point supports only a single route per Logical Router Port. To solve the multiple route (per router interface) issue while working within this OVN NB model restriction, I created multiple lport and lrouter port for each subnet supported by a router interface. Let's say a router interface supports both 192.168.1.0/24 and 2001:db8:cafe::/64 routes, I added 2 lport and 2 lrouter ports in the OVN NB. Logical Router Table: UUID-PA ["fa:16:3e:59:80:ad 192.168.1.1"] "port-1" {router-port="UUID-RA"} ["fa:16:3e:59:80:ad"] router UUID-PB ["fa:16:3e:59:80:ad 2001:db8:cafe::1"] "port-2" {router-port="UUID-RB"} ["fa:16:3e:59:80:ad"] router Logical Router Port Table: UUID-RA "fa:16:3e:59:80:ad" "port-1" "192.168.1.1/24" [] UUID-RB "fa:16:3e:59:80:ad" "port-2" "2001:db8:cafe::1/64" [] Note that both ports (in both tables) have the same MAC corresponding to the neutron router interface MAC. This results in the following logical flow: ... table=3(switch_in_l2_lkup), priority= 50, match=(eth.dst == fa:16:3e:59:80:ad), action=(outport = "port-2"; output;) table=3(switch_in_l2_lkup), priority= 50, match=(eth.dst == fa:16:3e:59:80:ad), action=(outport = "port-1"; output;) As we can see there are 2 conflicting/overlapping rules for the MAC in table 3 and the packet could be sent to the wrong output port. To support the multiple route per interface feature, we need to propose that OVN NB allow multiple routes per logical router port in ovs-dev or ovs-discuss. Additionally it seems that the MAC must be unique in the Logical Router Table per Logical Flow. Thanks Amitabha
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