F I G U R E   3 5 .   I S P   # 2 's   M o re   S p e c i f i c   R o u t e   i n t o   t h e   I n t e r n e t
The best strategy is for Organization A to retain ownership of its
address space and have ISP #2 advertise an  exception  (more specific)
route into the Internet. The exception route allows all traffic for to be sent to ISP #1, with the exception of the traffic to This routing is accomplished by having ISP #2 adver 
tise, in addition to its own block, a route for Refer to Figure 35. 
Using the longest match forwarding algorithm, Internet routers will
route traffic addressed to host to ISP #2, which will in
turn route the traffic to Organization A. Clearly, the introduction of a
large number of exception routes can reduce the effectiveness of the
CIDR deployment and eventually cause Internet routing tables to begin
exploding again. 
Additional Practice with CIDR 
Appendix E provides exercises using CIDR. 
3 9






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