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  1. Track the last time stamp any message was received on a local NI
  2. if the NI hasn't received any traffic for a period of router_ping_timeout + MAX(live_router_check_interval, dead_router_check_interval) then it's marked down
    1. This is done so that other nodes using the gateway can mark the route down, given that avoid_asym_router_failure is set to 1.
  3. Do not send messages to a peer NI which is marked down.
  4. Set the peer status to up when messages are received
  5. Query a For each peer NI , which that is marked down, a minimum of when there are messages to forward to it, query it at least once per second when there is traffic destined to check if it is back up. If the query result determines that the peer NI is reachable, the peer NI state is set to UP. Messages can then be send to that peer NI.

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