Specifies the time in seconds for which the router is considered to be reachable in the network.
Note: If this value is set to 0, the operating system will not use this router as the default router.
    - SNMP ID:
 - 2.70.2.2.11
 - Console path:
 - Setup > IPv6 > Router-Advertisement > Interface-Options
 - Possible values:
 0 … 2147483647 Seconds
- Default:
 - 1800