- When there is a route change, how does a BGP router handle that?
- At what time scale can a BGP router discover a route change?
- BGP employs a process called route dampening, which takes care of routes that change frequently. It assigns those routes a penalty and after a certain limit those routes are rendered useless. Now while in suspended state routes are again monitored and if they are stable for a time period (called half-life) there penalty is reduced. Each half-life penalty is reduced to a certain limit. When this penalty is reduced below a certain limit (reuse limit) they are put back again in routing table. All these parameters are configurable.
- As in route dampening you can configure half-life. If it's the initial flapped route, as soon as NLRI is not there or the TCP connection breaks BGP will come to know that route has changed.
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