28.4.

apiVersion: metallb.io/v1beta1
kind: IPAddressPool
metadata:
  namespace: metallb-system
  name: doc-example-bgp-community
spec:
  addresses:
    - 203.0.113.200/30
    - fc00:f853:ccd:e799::/124

$ oc apply -f ipaddresspool.yaml

apiVersion: metallb.io/v1beta2
kind: BGPPeer
metadata:
  namespace: metallb-system
  name: doc-example-bgp-peer
spec:
  peerAddress: 10.0.0.1
  peerASN: 64501
  myASN: 64500
  routerID: 10.10.10.10

$ oc apply -f bgppeer.yaml

apiVersion: metallb.io/v1beta1
kind: BGPAdvertisement
metadata:
  name: bgp-community-sample
  namespace: metallb-system
spec:
  aggregationLength: 32
  aggregationLengthV6: 128
  communities:
    - NO_ADVERTISE 1
  ipAddressPools:
    - doc-example-bgp-community
  peers:
    - doc-example-peer

$ oc apply -f bgpadvertisement.yaml