Say for example the number of tunnels is set to 6 for load balancing, the TNLM randomly selects six tunnels and then returns them to the RM.

If the status of the selected tunnels changes (for example, the first tunnel enters the Down state), the TNLM randomly selects another tunnel from two candidate ones.

If the tunnels go Up from the Down state and there are less than six tunnels for load balancing, the TNLM is triggered to re-select six tunnels and then returns them to the RM. Otherwise, the status of tunnels does not affect load balancing.

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