Please check the updated REQ1 in draft-ietf-dmm-requirements-02:
REQ1: Distributed deployment
IP mobility, network access and routing solutions provided by
DMM MUST enable distributed deployment for mobility management
of IP sessions so that traffic does not need to traverse
centrally deployed mobility anchors and thus can be routed in
an optimal manner.
Motivation: This requirement is motivated by current trends in
network evolution: (a) it is cost- and resource-effective to
cache and distribute content by combining distributed mobility
anchors with caching systems (e.g., CDN); (b) the
significantly larger number of mobile nodes and flows call for
improved scalability; (c) single points of failure are avoided
in a distributed system; (d) threats against centrally
deployed anchors, e.g., home agent and local mobility anchor,
are mitigated in a distributed system.
This requirement addresses problems PS1, PS2, PS3, and PS4 in the
following.
PS1: Non-optimal routes
Routing via a centralized anchor often results in a longer
route. The problem is especially manifested when accessing a
local server or servers of a Content Delivery Network (CDN).
PS2: Divergence from other evolutionary trends in network
architecture
Centralized mobility management can become non-optimal with a
flat network architecture.
PS3: Low scalability of centralized route and mobility context
maintenance
Setting up routes through a central anchor and maintaining
mobility context for each MN therein requires more resources is
more difficult to scale in a centralized design, thus reducing
scalability. Distributing the route maintenance function and
the mobility context maintenance function among different
network entities can increase scalability.
PS4: Single point of failure and attack
Centralized anchoring may be more vulnerable to single points
of failures and attacks than a distributed system. The impact
of a successful attack on a system with centralized mobility
management can be far greater as well.
H Anthony Chan
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