Scenario 6-3: BGP with Policy-Based Routing
In this scenario, you configure EBGP using the next hop addresses and use policy-based routing to allow certain network design policies to affect IP routing decisions.
Policy-based routing is used for the following main reasons:
To control traffic flow direction either by source or destination address
To change the next hop address
To change the way traffic is sent to a neighboring router
The advantages of using policy routing is the ability to load share to provide high-quality service and cost saving, based on data traffic, for expensive links.
Figure 6-4 displays the same two-router network used in Scenario 6-3, except this time you configure two EBGP sessions between R1 and R2 and use BGP to route ...
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