• I have a network and I want to list the ports on the ovs switch

[root@worker-4 ~]# ovs-vsctl  --columns=name,mac_in_use,mtu find interface external_ids:"k8s.ovn.org/network"="vlan-1924"
name                : "81a5ebcb6fa45_3"
mac_in_use          : "be:a0:20:9b:b1:de"
mtu                 : 1400

name                : "040cd3693b52c_3"
mac_in_use          : "c2:93:f7:05:0a:6e"
mtu                 : 1400

name                : "025ca4b7703f0_3"
mac_in_use          : "3e:e9:69:91:42:72"
mtu                 : 1400
[root@worker-4 ~]# ovs-vsctl  --columns=name,mac_in_use,mtu find interface external_ids:"k8s.ovn.org/network"="vlan-1926"
name                : "040cd3693b52c_4"
mac_in_use          : "0a:49:89:cf:97:81"
mtu                 : 1400

[root@worker-4 ~]# ovs-vsctl get interface 040cd3693b52c_4 mtu external_ids
1400
{attached_mac="02:14:56:00:00:07", iface-id=default.vlan.1926_demo-virt_virt-launcher-rhel-node-1-g5qx8, iface-id-ver="aea9ed07-5e3d-425e-8c0d-49b4e7ba66fe", "k8s.ovn.org/nad"="default/vlan-1926", "k8s.ovn.org/network"=vlan-1926, ovn-installed="true", ovn-installed-ts="1750089711663", sandbox="040cd3693b52c65ff667993d67678a8aa1cd48472de7d59f598f059e0360600b"}

• I have a NAD and I want to find interfaces on the OVS bridge

 # find ports on VLAN by NAD
[root@hub-4k77l-cnv-2xb92 ~]# ovs-vsctl --bare --columns=name find interface external_ids:"k8s.ovn.org/nad"="demo-ldap/localnet-1924-dhcp"
48b07435a9215_3

• I have a VM and I want to find the interface on the switch

$ oc get vmis,pods -o wide -n demo-client
NAME                                        AGE    PHASE     IP             NODENAME   READY   LIVE-MIGRATABLE   PAUSED
virtualmachineinstance.kubevirt.io/client   5d4h   Running   192.168.4.38   worker-4   True    True

NAME                             READY   STATUS    RESTARTS   AGE     IP            NODE       NOMINATED NODE   READINESS GATES
pod/virt-launcher-client-dhl7p   1/1     Running   0          2d12h   10.131.2.83   worker-4   <none>           1/1

$ oc rsh -n demo-client pod/virt-launcher-client-dhl7p ip -c -br link
lo               UNKNOWN        00:00:00:00:00:00 <LOOPBACK,UP,LOWER_UP>
eth0@if100       UP             0a:58:0a:83:02:53 <BROADCAST,MULTICAST,UP,LOWER_UP>
bf1af69c74c-nic@if101 UP             e2:38:e8:39:35:1e <BROADCAST,MULTICAST,UP,LOWER_UP>
k6t-bf1af69c74c  UP             16:15:68:ec:93:fc <BROADCAST,MULTICAST,UP,LOWER_UP>
tapbf1af69c74c   UP             16:15:68:ec:93:fc <BROADCAST,MULTICAST,UP,LOWER_UP>
podbf1af69c74c   DOWN           02:14:56:00:00:08 <BROADCAST,NOARP>

# there is often a stderr line of output about Polkit before the XML
$ oc rsh -n demo-client pod/virt-launcher-client-dhl7p virsh dumpxml 1 | grep -E '^\s*<\??' | xpath -q -e /domain/devices/interface
<interface type="ethernet">
      <mac address="02:14:56:00:00:08" />
      <target dev="tapbf1af69c74c" managed="no" />
      <model type="virtio-non-transitional" />
      <mtu size="1400" />
      <alias name="ua-nic-1924" />
      <rom enabled="no" />
      <address type="pci" domain="0x0000" bus="0x01" slot="0x00" function="0x0" />
    </interface>

Interface index is 100 for eth0 and 101 for the NIC which is the uplink from the linux bridge k6t-bf1af69c74c, the downlink is the tap interface which is passed into the VM container.

So ssh to worker-4 and lookup the switch port with ifindex 101.

[root@worker-4 ~]# ovs-vsctl find interface ifindex=101
_uuid               : 6dfe40d9-ebe1-43ae-8e3c-70641d841168                                                                                                                admin_state         : up
bfd                 : {}
bfd_status          : {}
cfm_fault           : []
cfm_fault_status    : []
cfm_flap_count      : []
cfm_health          : []
cfm_mpid            : []
cfm_remote_mpids    : []
cfm_remote_opstate  : []
duplex              : full
error               : []
external_ids        : {attached_mac="02:14:56:00:00:08", iface-id=default.vlan.1924_demo-client_virt-launcher-client-dhl7p, iface-id-ver="1c71fdf9-44f3-4fb4-aefa-e950a957
1b57", "k8s.ovn.org/nad"="default/vlan-1924", "k8s.ovn.org/network"=vlan-1924, ovn-installed="true", ovn-installed-ts="1750089884077", sandbox="81a5ebcb6fa45d69a32a15d1e1
cf617113d4ccfc12338522adb4119bc295e10f"}
ifindex             : 101
ingress_policing_burst: 0
ingress_policing_kpkts_burst: 0
ingress_policing_kpkts_rate: 0
ingress_policing_rate: 0
lacp_current        : []
link_resets         : 2
link_speed          : 10000000000
link_state          : up
lldp                : {}
mac                 : []
mac_in_use          : "be:a0:20:9b:b1:de"
mtu                 : 1400
mtu_request         : []
name                : "81a5ebcb6fa45_3"
ofport              : 99
ofport_request      : []
options             : {}
other_config        : {}
statistics          : {collisions=0, rx_bytes=4398008, rx_crc_err=0, rx_dropped=0, rx_errors=0, rx_frame_err=0, rx_missed_errors=0, rx_multicast_packets=0, rx_over_err=0,
 rx_packets=47894, tx_bytes=1275190855, tx_dropped=0, tx_errors=0, tx_packets=1882373, upcall_errors=0, upcall_packets=4728}
status              : {driver_name=veth, driver_version="1.0", firmware_version=""}
type                : ""

• I know the virt launcher pod name and namespace

[root@worker-4 ~]# ovs-vsctl  --columns=name,mac_in_use,mtu find interface external_ids:iface-id=default.vlan.1924_demo-client_virt-launcher-client-dhl7p
name                : "81a5ebcb6fa45_3"
mac_in_use          : "be:a0:20:9b:b1:de"
mtu                 : 1400