Load Sharing with Static Routes Optimizing Return Traffic Cont

© 2004 Cisco Systems, Ii

© 2004 Cisco Systems, Ii

In the example here, the customer address space 11.2.3.0/24 is partitioned into two smaller blocks: 11.2.3.0/25 and 11.2.3.128/25.

The upper provider edge router advertises the route to 11.2.3.0/25, and the lower router advertises the route to 11.2.3.128/25. Both edge routers also advertise the entire address space 11.2.3.0/24.

The routers in the ISP network direct traffic with destination addresses in the 11.2.3.0/25 range to the upper connection point. Traffic to destinations in the 11.2.3.128/25 range is directed to the lower connection point.

5-44 Configuring BGP on Cisco Routers (BGP) v3.1 Copyright © 2004, Cisco Systems, Inc.

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