During warm reboot, linkmgrd would go away and so heartbeats will
be lost. This would result in standby link son peer ToR to pull the
link active. This is undesirable since we would not create tunnel
from the ToR that is being rebooted to the peer ToR. This PR
implicitly lock the state of the mux if config is not set to auto.
Also, orchagent does not initialize MUX to it hardware state, rather
it initilizes MUX to Unknown state. linkmgrd will detect this situation
and probe MUX state to correct orchagent state.
There a fix for the case when state os switched MUX is delayed. The
PR will poll the MUX for the new state. This is required to update
the state ds and hence create/tear tunnel.
signed-off-by: Tamer Ahmed <tamer.ahmed@microsoft.com>
Linkmgrd monitors link status, mux status, and link state. Has
the link becomes unhealthy, linkmgrd will trigger mux switchover
on a standby ToR ensuring uninterrupted service to servers/blades.
This PR is initial implementation of linkmgrd.
Also, docker-mux container hold packages related to maintaining and managing
mux cable. It currently runs linkmgrd binary that monitor and switches
the mux if needed.
This PR also introduces mux-container and starts linkmgrd as startup when
build is configured with INCLUDE_MUX=y
Edit: linkmgrd PR will follow.
signed-off-by: Tamer Ahmed <tamer.ahmed@microsoft.com>
Related work items: #2315, #3146150
