Case Study: Route Dampening
One thing that causes major problems in truly large-scale networks is a destination that flaps regularly, or goes up and down several times in succession within a short period of time. BGP allows a network administrator to stop accepting a route from an external neighbor for a certain period of time through dampening. Note that dampening works for eBGP routes only.
The configuration for this capability is very simple—it's just a single extra configuration command (see Figure 8-12).
Figure 8-12. Simple Dampening Example
For example, if you wanted to dampen the routes from Router B in Figure 8-12, you would configure: ...
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