After installing and setting up metallb operator, BGP peers are not displayed in the network appliances and no routes are getting advertised.
    

4.20, 4.19, 4.18 and 4.17
    

Always
    

    1. Deploy one of the latest version of the OCP mentioned above in baremetal servers
    2. Deploy MetalLB operator and set it up
    3. Verify BGP peers and BGP routes in the network appliances, and there are none.

Note: OCP upgrades from 4.17 to 4.18 also show this issue
    

BGP peers not getting established and BGP routes not advertised to network appliance
    

BGP peers should get established and BGP routes advertised to network appliance
    

- We use NMstate LACP bonding interface at day2 to BGP traffic with dualstack.
- In 4.18 this is working with metallb-operator.v4.18.0-202504021503
- In 4.17 last working job was with metallb-operator.v4.17.0-202503251509
    

$ oc get clusterversion
NAME      VERSION   AVAILABLE   PROGRESSING   SINCE   STATUS
version   4.18.10   True        False         94m     Cluster version is 4.18.10

$ oc get nodes
NAME       STATUS   ROLES                  AGE    VERSION
master-0   Ready    control-plane,master   155m   v1.31.7
master-1   Ready    control-plane,master   155m   v1.31.7
master-2   Ready    control-plane,master   154m   v1.31.7
worker-0   Ready    worker                 104m   v1.31.7
worker-1   Ready    worker                 102m   v1.31.7
worker-2   Ready    worker                 104m   v1.31.7
worker-3   Ready    worker                 105m   v1.31.7

$ oc -n metallb-system get pods -o wide
NAME                                                   READY   STATUS    RESTARTS   AGE   IP              NODE       NOMINATED NODE   READINESS GATES
controller-c7bf456c4-v4d65                             2/2     Running   0          53m   10.129.2.12     worker-2   <none>           <none>
frr-k8s-4c6sm                                          6/6     Running   0          53m   192.168.12.25   worker-1   <none>           <none>
frr-k8s-gqhmt                                          6/6     Running   0          53m   192.168.12.27   worker-3   <none>           <none>
frr-k8s-rs7rk                                          6/6     Running   0          53m   192.168.12.26   worker-2   <none>           <none>
frr-k8s-wczjz                                          6/6     Running   0          53m   192.168.12.24   worker-0   <none>           <none>
frr-k8s-webhook-server-fc99ff78-vxgrx                  1/1     Running   0          53m   10.130.2.9      worker-1   <none>           <none>
metallb-operator-controller-manager-67594c4b87-brxxd   1/1     Running   0          62m   10.129.2.8      worker-2   <none>           <none>
metallb-operator-webhook-server-7f44b9699c-jb6tm       1/1     Running   0          62m   10.129.2.9      worker-2   <none>           <none>
speaker-m7mrt                                          2/2     Running   0          53m   192.168.12.27   worker-3   <none>           <none>
speaker-p8nsr                                          2/2     Running   0          53m   192.168.12.24   worker-0   <none>           <none>
speaker-tmf2t                                          2/2     Running   0          53m   192.168.12.25   worker-1   <none>           <none>
speaker-xcjts                                          2/2     Running   0          53m   192.168.12.26   worker-2   <none>           <none>

$ oc -n metallb-system get csv
NAME                                    DISPLAY                     VERSION               REPLACES                 PHASE
metallb-operator.v4.18.0-202504090803   MetalLB Operator            4.18.0-202504090803                            Succeeded

[dciteam@jumphost collection-scripts]$ oc -n metallb-system logs speaker-p8nsr | grep error
Defaulted container "speaker" out of: speaker, kube-rbac-proxy
{"caller":"speakerlist.go:259","error":null,"expected":3,"joined":2,"level":"error","msg":"partial join","op":"memberDiscovery","ts":"2025-04-22T20:00:14Z"}
{"caller":"announcer.go:131","error":"creating NDP responder for \"eno5np0\": listen ip6:ipv6-icmp fe80::f603:43ff:fecd:16e0%eno5np0: bind: cannot assign requested address","interface":"eno5np0","level":"error","msg":"failed to create NDP responder","op":"createNDPResponder","ts":"2025-04-22T20:01:44Z"}
{"caller":"announcer.go:131","error":"creating NDP responder for \"ens2f0\": listen ip6:ipv6-icmp fe80::3efd:feff:febb:2078%ens2f0: bind: cannot assign requested address","interface":"ens2f0","level":"error","msg":"failed to create NDP responder","op":"createNDPResponder","ts":"2025-04-22T20:01:44Z"}
{"caller":"announcer.go:131","error":"creating NDP responder for \"ens2f1\": listen ip6:ipv6-icmp fe80::3efd:feff:febb:2079%ens2f1: bind: cannot assign requested address","interface":"ens2f1","level":"error","msg":"failed to create NDP responder","op":"createNDPResponder","ts":"2025-04-22T20:01:44Z"}
{"caller":"announcer.go:131","error":"creating NDP responder for \"eno6np1\": listen ip6:ipv6-icmp fe80::f603:43ff:fecd:16e8%eno6np1: bind: cannot assign requested address","interface":"eno6np1","level":"error","msg":"failed to create NDP responder","op":"createNDPResponder","ts":"2025-04-22T20:08:14Z"}

[dciteam@jumphost collection-scripts]$ oc -n metallb-system exec daemonset/frr-k8s -c frr -- vtysh -c "show ip bgp summary"

IPv4 Unicast Summary (VRF default):
BGP router identifier 192.168.16.139, local AS number 65012 vrf-id 0
BGP table version 1
RIB entries 1, using 192 bytes of memory
Peers 8, using 5797 KiB of memory

Neighbor             V         AS   MsgRcvd   MsgSent   TblVer  InQ OutQ  Up/Down State/PfxRcd   PfxSnt Desc
192.168.15.2         4      65000         0         0        0    0    0    never         Idle        0 N/A
192.168.15.3         4      65000         0         0        0    0    0    never         Idle        0 N/A
192.168.16.130       4      65000         0         0        0    0    0    never         Idle        0 N/A
192.168.16.131       4      65000         0         0        0    0    0    never         Idle        0 N/A
fd48:de67:5083:16::2 4      65000         0         0        0    0    0    never         Idle        0 N/A
fd48:de67:5083:16::3 4      65000         0         0        0    0    0    never         Idle        0 N/A
fdb0:5b22:e86a:15::2 4      65000         0         0        0    0    0    never         Idle        0 N/A
fdb0:5b22:e86a:15::3 4      65000         0         0        0    0    0    never         Idle        0 N/A

Total number of neighbors 8

[dciteam@jumphost collection-scripts]$ oc -n metallb-system exec daemonset/frr-k8s -c frr -- vtysh -c "show ip bgp"
BGP table version is 1, local router ID is 192.168.16.139, vrf id 0
Default local pref 100, local AS 65012
Status codes:  s suppressed, d damped, h history, * valid, > best, = multipath,
               i internal, r RIB-failure, S Stale, R Removed
Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self
Origin codes:  i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

    Network          Next Hop            Metric LocPrf Weight Path
 *> 10.100.1.50/32   0.0.0.0                  0         32768 i

Displayed  1 routes and 1 total paths

dfw01edge-sp01#show ip bgp summary
BGP summary information for VRF default
Router identifier 192.168.103.2, local AS number 65000
Neighbor Status Codes: m - Under maintenance
  Neighbor         V  AS           MsgRcvd   MsgSent  InQ OutQ  Up/Down State   PfxRcd PfxAcc
  192.168.5.30     4  65001         112699    112754    0    0    7d05h Estab   2      2
dfw01edge-sp01#show ip bgp
BGP routing table information for VRF default
Router identifier 192.168.103.2, local AS number 65000
Route status codes: s - suppressed, * - valid, > - active, # - not installed, E - ECMP head, e - ECMP
                    S - Stale, c - Contributing to ECMP, b - backup, L - labeled-unicast
Origin codes: i - IGP, e - EGP, ? - incomplete
AS Path Attributes: Or-ID - Originator ID, C-LST - Cluster List, LL Nexthop - Link Local Nexthop

         Network                Next Hop            Metric  LocPref Weight  Path
 * >     10.10.0.0/24           192.168.5.30          0       100     0       65001 i
 * >     10.20.0.0/24           192.168.5.30          0       100     0       65001 i
dfw01edge-sp01#show ip route bgp

VRF: default
Codes: C - connected, S - static, K - kernel, 
       O - OSPF, IA - OSPF inter area, E1 - OSPF external type 1,
       E2 - OSPF external type 2, N1 - OSPF NSSA external type 1,
       N2 - OSPF NSSA external type2, B - BGP, B I - iBGP, B E - eBGP,
       R - RIP, I L1 - IS-IS level 1, I L2 - IS-IS level 2,
       O3 - OSPFv3, A B - BGP Aggregate, A O - OSPF Summary,
       NG - Nexthop Group Static Route, V - VXLAN Control Service,
       DH - DHCP client installed default route, M - Martian,
       DP - Dynamic Policy Route, L - VRF Leaked

 B E      10.10.0.0/24 [200/0] via 192.168.5.30, Vlan10
 B E      10.20.0.0/24 [200/0] via 192.168.5.30, Vlan10