Aggregatable Address



Aggregator
TLA (Top Level Aggregator)
2^13 = 8,192 external routes
NLA (Next Level Aggregator)
NLA1, NLA2,...
SLA (Site Level Aggregator)
2^16 = 65,536 subnets
A site is given 6 byte prefix
Interface Index
Enough space for MAC address
Prefix length (netmask) is fixed to 64