A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Mobile Ad-hoc Networks Working Group of the IETF.
Title : Landmark Routing Protocol (LANMAR) for Large Scale Ad
Hoc Networks
Author(s) : M. Gerla et al.
Filename : draft-ietf-manet-lanmar-05.txt
Pages : 21
Date : 2002-11-7
The Landmark Routing Protocol (LANMAR) utilizes the concept of
landmark for scalable routing in large, mobile ad hoc networks.
It relies on the notion of group mobility: i.e., a logical group
(for example a team of coworkers at a convention) moves in a
coordinated fashion. The existence of such logical group can be
efficiently reflected in the addressing scheme. It assumes that
an IP like address is used consisting of a group ID (or subnet ID)
and a host ID, i.e. <Group ID, Host ID>. A landmark is dynamically
elected in each group. The route to a landmark is propagated
throughout the network using a Distance Vector mechanism.
Separately, each node in the network uses a scoped routing
algorithm (e.g., FSR) to learn about routes within a given (max
number of hops) scope. To route a packet to a destination outside
its scope, a node will direct the packet to the landmark
corresponding to the group ID of such destination. Once the packet
approaches the landmark, it will typically be routed directly to
the destination. A solution to nodes outside of the scope of their
landmark (i.e., drifters) is also addressed in the draft. Thus,
by summarizing in the corresponding landmarks the routing
information of remote groups of nodes and by using the truncated
local routing table, LANMAR dramatically reduces routing table size
and routing update overhead in large networks. The dynamic
election of landmarks enables LANMAR to cope with mobile
environments. LANMAR is well suited to provide an efficient and
scalable routing solution in large, mobile, ad hoc environments in
which group behavior applies and high mobility renders traditional
routing schemes inefficient.
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