This is a tip for understanding and referring how we can fat down NDP for 6lowpan networks. In 16ng working group, we tried to live up with IEEE 802.16 Idle/Sleep mode in conjunction with IPv6 NDP. Here is a RA optimization results...
Hope those efforts help... Daniel Park Co-chair, 16ng working group. *8.2**. Router Advertisement* The AR SHOULD send a number (configurable value) of router advertisements as soon as the IPv6 link is established, to the MS. The AR sends unsolicited router advertisements periodically as per [RFC4861 <http://tools.ietf.org/html/rfc4861>]. The interval between periodic router advertisements is however greater than the specification in Neighbor discovery for IPv6, and is discussed in the following section. *8.3**. Router lifetime and periodic router advertisements* The router lifetime SHOULD be set to a large value, preferably in hours. This document over-rides the specification for the value of the router lifetime in Neighbor Discovery for IP Version 6 (IPv6) [RFC4861 <http://tools.ietf.org/html/rfc4861>]. The AdvDefaultLifetime in the router advertisement MUST be either zero or between MaxRtrAdvInterval and 43200 seconds. The default value is 2 * MaxRtrAdvInterval. 802.16 hosts have the capability to transition to an idle mode in which case the radio link between the BS and MS is torn down. Paging is required in case the network needs to deliver packets to the MS. In order to avoid waking a mobile which is in idle mode and consuming resources on the air interface, the interval between periodic router advertisements SHOULD be set quite high. The MaxRtrAdvInterval value specified in this document over-rides the recommendation in Neighbor Discovery for IP Version 6 (IPv6) [RFC4861<http://tools.ietf.org/html/rfc4861>]. The MaxRtrAdvInterval MUST be no less than 4 seconds and no greater than 21600 seconds. The default value for MaxRtrAdvInterval is 10800 seconds.
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