On this post, the two subnets 10.4.6.0/24 and 10.4.7.0/24 were summarized into a single entry of 10.4.0.0/16. As seen, the two network address were IP segments located on Auckland routers. For the simplicity, I have just change the configuration of SYDNEY router’s static routing.
· A summary route is an address that encompasses several more specific addresses in a route table.
· It is the address mask used with a route entry that makes static routes as flexible as they are; by using an appropriate address mask, it is sometimes possible to create a single summary route for several destination addresses.
· For example, the 10.4.6.0/24 and 10.4.7.0/24 could be specified with a single entry of 10.4.0.0/16.
Using the same topology below,
From SYDNEY Router, I have removed 10.4.6.0/24 & 10.4.7.0/24 and just add a single /16
subnets.
The show ip route shows a single entry for 10.4.0.0 via MELBOURNE router. It shows that the PC on AUCKLAND is still reachable.
NETWORK LESSON 
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