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Handle dual ToR neighbor miss scenario (sonic-net#2151)
* Handle dual ToR neighbor miss scenario (sonic-net#2137) - When orchagent receives a neighbor update with a zero MAC: - If the neighbor IP is configured for a specific mux cable port in the MUX_CABLE table in CONFIG_DB, handle the neighbor normally (if active for the port, no action is needed. if standby, a tunnel route is created for the neighbor IP) - If the neighbor IP is not configured for a specific port, create a tunnel route for the IP to the peer switch. - When these neighbor IPs are eventually resolved, remove the tunnel route and handle the neighbor normally. - When creating/initializing a mux cable object, set the internal state to standby to match the constructor behavior. - Various formatting fixes inside test_mux.py - Remove references to deprecated `@pytest.yield_fixture` - Add dual ToR neighbor miss test cases: - Test cases and expected results are described in `mux_neigh_miss_tests.py`. These descriptions are used by the generic test runner `test_neighbor_miss` function to execute the test actions and verify expected results - Various setup fixtures and test info fixtures were added - Existing test cases were changed to use these setup fixtures for consistency Signed-off-by: Lawrence Lee <lawlee@microsoft.com> Co-authored-by: Sumukha Tumkur Vani <stumkurv@microsoft.com>
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