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Bug
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Resolution: Unresolved
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Normal
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None
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4.20
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Quality / Stability / Reliability
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False
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None
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None
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None
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None
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Rejected
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None
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None
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None
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None
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None
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None
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None
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None
When layer2 secondary UDN is created at a cluster that has override default pod network join subnet and mathes the one at UDN we have the following error
- apiVersion: k8s.ovn.org/v1
kind: UserDefinedNetwork
metadata:
creationTimestamp: "2025-10-09T12:18:03Z"
finalizers:
- k8s.ovn.org/user-defined-network-protection
generation: 1
name: gryffindor
namespace: e2e-endpointslices-mirror-e2e-default-3164
resourceVersion: "1130969"
uid: e5dcf3f0-b7b1-429b-9bfc-da410921f656
spec:
layer2:
role: Secondary
subnets:
- 203.203.0.0/16
topology: Layer2
status:
conditions:
- lastTransitionTime: "2025-10-09T12:18:03Z"
message: 'failed to generate NetworkAttachmentDefinition: failed to render CNI
network config: invalid subnet configuration: pod or join subnet overlaps
with already configured internal subnets: illegal network configuration: user
defined join subnet "100.65.0.0/16" overlaps built-in join subnet "100.65.0.0/16"'
reason: SyncError
status: "False"
type: NetworkCreated
This should not happend since layer2 secondary networks do not need join subnets.
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