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[HLD]: Add HLD for mux subnet slicing#2318

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Ndancejic:subnet-slicing-hld
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[HLD]: Add HLD for mux subnet slicing#2318
Ndancejic wants to merge 1 commit into
sonic-net:masterfrom
Ndancejic:subnet-slicing-hld

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@Ndancejic
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This is the HLD for mux subnet slicing on dualtor topologies. The feature reduces switchover impact under large neighbor volume by configuring a subnet slice route that forwards VM traffic to the server_ipv6 nexthop instead of to individual neighbors.

Related PRs:
TBD - will be updated as they open

Repo PR title State
sonic-swss TBD — orchagent (MuxOrch / NeighborOrch) subnet-slice support TBD
sonic-buildimage TBD — subnet_slice_ipv6 YANG model TBD
sonic-utilities TBD — show mux config slice column TBD
sonic-utilities TBD — dualtor_neighbor_check slice awareness TBD
sonic-mgmt TBD — subnet-slicing test cases TBD

Adds high-level design for subnet slicing on dualtor.

Signed-off-by: Nikola Dancejic <ndancejic@microsoft.com>
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/azp run

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@Ndancejic Ndancejic marked this pull request as draft May 4, 2026 22:56
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