SLA ID   Indicates the Site Level Aggregator (SLA) for the address.
The SLA ID is used by an individual organization to identify subnets
within its site. The size of this field is 16 bits. The organization can
use these 16 bits to create 65,536 subnets or multiple levels of
addressing hierarchy and an efficient routing infrastructure. With 16
bits of subnetting flexibility, an aggregatable global unicast prefix
assigned to an organization is equivalent to that organization being
allocated an IPv4 Class A network ID (assuming that the last octet is
used for identifying nodes on subnets). The structure of the cus 
tomer's network is transparent to the ISP.
  Interface ID   Indicates the interface on a specific subnet. The size of
this field is 64 bits.
With IPv6, small to regional network service providers and end users
will no longer have the ability to obtain address space directly from reg 
istries. Instead, TLAs will be assigned address blocks, which they will
in turn be in charge of managing and delegating to their downstream
connections (NLAs and SLAs). This shift in address management is
thought to be much more efficient than the current address management
policies. This policy places the burden on backbone TLA core providers
to carry the routes as transit. With this new hierarchical architecture,
the number of Internet Core routing entries that need to be carried is
decreased, thus limiting the scope of future Internet routing complex 
ity. Figure 38 depicts a generic addressed IPv6 Internet.
F I G U R E   3 8 .   R o u t i n g   A d v e r t i s e m e n t s   w i t h   I P v 6
Figure 38 shows two TLAs, and a variety of NLAs, and SLAs in various
configurations. TLA I owns a Top Level Aggregator block. TLA I is
assigned 3FFE:2900::/24 as its TLA delegation, and TLA II is assigned
3FFE:4200::/24 as its TLA delegation. TLA I and TLA II must supply
each other with these routes for routing to operate properly between
TLA I and TLA II backbones. 
TLA I must subdelegate blocks of address space to its NLA and SLA
customers. In this case, NLA I is assigned 3FFE:2900:1::/48, and NLA II
is assigned 3FFE:2900:2::/48. These NLAs then delegate blocks to their
customers out of this block. 
4 7






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