Cascade PortChannel admin shutdown to member ports#4424
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spandan-nexthop wants to merge 1 commit intosonic-net:masterfrom
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Cascade PortChannel admin shutdown to member ports#4424spandan-nexthop wants to merge 1 commit intosonic-net:masterfrom
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When a PortChannel is admin-shut, force all member ports admin-down. This allows the peer device to immediately detect link-down instead of waiting for LACP timeout. On PortChannel admin-up (or member removal/LAG deletion), restore each member to its configured admin state from APP_DB. Signed-off-by: Spandan Chowdhury <spandan@nexthop.ai>
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When a PortChannel is admin-shut, force all member ports admin-down. This allows the peer device to immediately detect link-down instead of waiting for LACP timeout.
On PortChannel admin-up (or member removal/LAG deletion), restore each member to its configured admin state from APP_DB.
What I did
Added
cascadeLagAdminStatusToMembers()inportsorchwhich propagates LAG admin-down to member ports viasetPortAdminStatus().Added a guard in
doPortTask()to prevent APP_DB from overriding the forced state.On LAG admin-up (or member removal/LAG deletion), each member's configured admin status is restored to the intended state.
Why I did it
When a PortChannel is admin-shut, its member links' transceivers remain physically active.
The peer device must rely on LACP timeout to detect the PortChannel is down, which introduces unnecessary delay (up to 90s with long timeout).
How I verified it
test_lag_admin_down_cascades_to_members,test_lag_deletion_restores_member_admin_stateconfig interface shutdown PortChannelXXXX→ verify member port LEDs go off and peer detects link-down immediatelyDetails if related
Fixes: sonic-net/sonic-buildimage#26494
cc: @venkit-nexthop @kalash-nexthop