The success of aggregation is largely dependent on careful allocation of network addresses.
For example: Router A <---------> Router B <--------> Router C
If the routing table for Router B has:
10.1.16.0 |
masklen 22 |
10.1.20.0 |
masklen 22 |
10.1.24.0 |
masklen 22 |
10.1.28.0 |
masklen 22 |
Aggregation reduces the routing table entry on Router C to a single entry:
10.1.16.0 |
masklen 20 |
Aggregation occurs on the even bit boundary from the left.
To aggregate a new set of static routes: