[v1.18] loadbalancer: Fix topology-aware routing safe-guards #41116
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[ upstream commit a5819f1 ] Cilium's topology-aware implementation did not correctly implement the following safe guards [1]: 4. If no fitting backend found for current zone us backends from all zones 5. Use all backends if one or more endpoints did not have zone hints It did correctly implement: (1. insufficient endpoints (endpointslice controller responsibility) (2. unbalanced allocation (endpointslice controller responsibility) 3. Use all backends if local node missing zone label This is fixed by doing an additional iteration over the backends to check 4. and 5. before trying to apply the zone hints. [1]: https://kubernetes.io/docs/concepts/services-networking/topology-aware-routing/#enabling-topology-aware-routing. Fixes: e35c099 ("experimental: Implement support for topology-aware routing") Fixes: cilium#41022 Signed-off-by: Jussi Maki <jussi@isovalent.com>
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aanm
approved these changes
Aug 13, 2025
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[ upstream commit a5819f1 ]
Cilium's topology-aware implementation did not correctly implement the following safe guards 1:
It did correctly implement:
(1. insufficient endpoints (endpointslice controller responsibility)
(2. unbalanced allocation (endpointslice controller responsibility)
3. Use all backends if local node missing zone label
This is fixed by doing an additional iteration over the backends to check
4. and 5. before trying to apply the zone hints.
Fixes: e35c099 ("experimental: Implement support for topology-aware routing")
Fixes: #41022