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Bug
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Resolution: Done-Errata
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Normal
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None
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4.18
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Important
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No
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Rejected
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False
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N/A
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Release Note Not Required
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In Progress
Description of problem:
Create a CUDN which generates nads on 2 ns, and create multicast testing pods. Sending multicast traffic on all pods to join a multicast group. Check traffics on pods, they can not receive multicast traffic.Â
How reproducible:
always
Steps to Reproduce:
1. create cudn in ns a1 and a2
% cat cudn.yaml apiVersion: k8s.ovn.org/v1 kind: ClusterUserDefinedNetwork metadata:  name: net3 spec:  namespaceSelector:   matchExpressions:   - key: kubernetes.io/metadata.name    operator: In    values: ["a1", "a2"]  network:   topology: Layer3   layer3:    role: Primary    subnets: [{cidr: "10.100.0.0/16"}]
2. create ns a1 and ns a2 and enable multicast
oc annotate namespace a1 k8s.ovn.org/multicast-enabled=true oc annotate namespace a2 k8s.ovn.org/multicast-enabled=true
3. create multicast pods in a1
% cat multicast-rc.json
{
  "apiVersion": "v1",
  "kind": "ReplicationController",
  "metadata": {
"labels": {
  "name": "mcast-rc"
},
"name": "mcast-rc"
  },
  "spec": {
"replicas": 3,
"template": {
  "metadata": {
"labels": {
  "name": "mcast-pods"
}
  },
  "spec": {
"containers": [
  {
"image": "quay.io/openshifttest/mcast-pod@sha256:aa2a8fdcfeddb09097e6a7201cfdb062db8d92d523cbcf758ef7d3545a1f5776",
"name": "mcast-pod"
  }
]
  }
}
  }
}
4. get udn primary ip of pods
% oc get pods NAME       READY  STATUS  RESTARTS  AGE mcast-rc-6s2qd  1/1   Running  0     68m mcast-rc-hwfw2  1/1   Running  0     68m mcast-rc-lp24d  1/1   Running  0     68m % oc describe pods | grep eth0             "interface": "eth0",  Normal AddedInterface 68m  multus       Add eth0 [10.129.2.18/23 10.100.3.3/24] from ovn-kubernetes             "interface": "eth0",  Normal AddedInterface 68m  multus       Add eth0 [10.128.2.33/23 10.100.2.5/24] from ovn-kubernetes             "interface": "eth0",  Normal AddedInterface 68m  multus       Add eth0 [10.131.0.16/23 10.100.1.3/24] from ovn-kubernetes
5. send multicast traffic on all pods and check if pods can receive multicast traffic or not
e.g: % oc rsh mcast-rc-6s2qd ~ $ omping -c 5 -T 15 10.100.3.3 10.100.2.5 10.100.1.3 10.100.2.5 : waiting for response msg 10.100.1.3 : waiting for response msg 10.100.2.5 : waiting for response msg 10.100.1.3 : waiting for response msg 10.100.2.5 : joined (S,G) = (*, 232.43.211.234), pinging 10.100.2.5 : Â unicast, seq=1, size=69 bytes, dist=2, time=1.285ms 10.100.2.5 : Â unicast, seq=2, size=69 bytes, dist=2, time=1.249ms 10.100.1.3 : waiting for response msg 10.100.1.3 : joined (S,G) = (*, 232.43.211.234), pinging 10.100.2.5 : Â unicast, seq=3, size=69 bytes, dist=2, time=1.303ms 10.100.1.3 : Â unicast, seq=1, size=69 bytes, dist=2, time=0.805ms 10.100.1.3 : Â unicast, seq=2, size=69 bytes, dist=2, time=0.990ms 10.100.2.5 : Â unicast, seq=4, size=69 bytes, dist=2, time=1.224ms 10.100.1.3 : Â unicast, seq=3, size=69 bytes, dist=2, time=0.993ms 10.100.2.5 : Â unicast, seq=5, size=69 bytes, dist=2, time=1.190ms 10.100.2.5 : given amount of query messages was sent 10.100.1.3 : Â unicast, seq=4, size=69 bytes, dist=2, time=0.936ms 10.100.1.3 : Â unicast, seq=5, size=69 bytes, dist=2, time=0.973ms 10.100.1.3 : given amount of query messages was sent 10.100.2.5 : Â unicast, xmt/rcv/%loss = 5/5/0%, min/avg/max/std-dev = 1.190/1.250/1.303/0.046 10.100.2.5 : multicast, xmt/rcv/%loss = 5/0/100%, min/avg/max/std-dev = 0.000/0.000/0.000/0.000 10.100.1.3 : Â unicast, xmt/rcv/%loss = 5/5/0%, min/avg/max/std-dev = 0.805/0.939/0.993/0.078 10.100.1.3 : multicast, xmt/rcv/%loss = 5/0/100%, min/avg/max/std-dev = 0.000/0.000/0.000/0.000
multicast, xmt/rcv/%loss = 5/0/100% means all muticast traffics are dropped.
Actual results:
cudn pods can not receive multicast traffic
Expected results:
cudn pods should receive multicast traffic
Additional info:
Build image via build 4.18.0-0.nightly,openshift/api#2127,openshift/ovn-kubernetes#2403
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- links to
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RHBA-2025:4019
OpenShift Container Platform 4.18.z bug fix update