Route Churn
The combination of indeterministic multiple exit discriminator and route reflectors can cause a condition where the BGP table on a set of routers will constantly churn between two different best paths; Figure 8.12 illustrates a network in which this will occur.
Figure 8.12. A network with persistent route churn
The costs shown along each link are the interior gateway protocol costs; we'll assume the cost of the links between AS65000 and the other autonomous systems are all 5. So the interior gateway protocol cost of router E to reach 10.2.2.2 will be 23. Examining the path to 172.17.1.0/24 at the routers along the edge of AS65000, ...
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