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Add custom-monitored IPv4 and IPv6 host-route regressions for sonic-mgmt#28320 and sonic-swss#4910. Require a competing APP_DB BGP route and preserve the VNET ASIC next hop and forwarding after withdrawal. Signed-off-by: Jing Zhang <26625909+zjswhhh@users.noreply.github.com> Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Signed-off-by: Jing Zhang <26625909+zjswhhh@users.noreply.github.com> Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Description of PR
Summary: Add a regression for VNET-first, same-prefix BGP withdrawal.
Fixes #28320. Related bug: sonic-net/sonic-swss#4910.
Type of change
Back port request
Tracking issue/work item for backport/cherry-pick request (GitHub issue or Microsoft ADO): N/A; no backport requested.
Failure type: Test coverage gap.
Tested branch
Test result
The new test has not run on a SONiC image or testbed. Hardware validation is pending.
Approach
What is the motivation for this PR?
Existing cases do not cover activating VNET before adding and then withdrawing only BGP.
How did you do it?
Activate a custom-monitored VNET host route, add same-prefix BGP, confirm its APP_DB entry, and withdraw only BGP. Verify the original ASIC route/VR/next hop, monitor Up state, and VXLAN forwarding remain intact. Cover IPv4 /32 and IPv6 /128.
Disable VNET's local prefix advertisement only for this case so it cannot hide the competing BGP path. Reuse existing cleanup, remove synthetic monitor state, and make the neighbor helper support host prefixes.
Any platform specific information?
Inherits the suite's Cisco-8000, Mellanox, and VPP support; other platforms are skipped.
Supported testbed topology if it's a new test case?
T1, including t1-64-lag and t1-56-lag.
Documentation
The test docstring describes the regression sequence.