F I G U R E   3 2 .   R e d u c e d   S i z e   o f   I n t e r n e t   R o u t i n g   Ta b l e s
Figure 32 illustrates how the allocation described in the previous CIDR
example helps reduce the size of the Internet routing tables. Assume
that a portion of the ISP's address block (200.25.16.0/20) has been allo 
cated as described in the previous example: 
  Organization A aggregates eight /24s into a single advertisement
(200.25.16.0/21)
  Organization B aggregates four /24s into a single advertisement
(200.25.24.0/22)
  Organization C aggregates two /24s into a single advertisement
(200.25.28.0/23)
  Organization D aggregates two /24s into a single advertisement
(200.25.30.0/23) 
Then the ISP can inject the 256 /24s in its allocation into the Internet
with a single advertisement 200.25.0.0/16. 
Note that route aggregation by means of BGP 4 (the protocol that allows
CIDR aggregation) is not automatic. The network engineers must config 
ure each router to perform the required aggregation. The successful
deployment of CIDR allows the number of individual networks on the
Internet to expand while minimizing the number of routes in the Inter 
net routing tables. 
3 7






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