Hi Bill, > Bill Blackford > Sent: 08 May 2015 19:39 > I'm trying to engineer a simple solution to generate a default route. My > initial approach is to generate based on the existence of a prefix in my > FIB received via an BGP announcement as my "contributing route". If this > prefix goes away, my "aggregate" default route is withdrawn. I've labbed > this up and it works as expected. > > Knowing that CIDR lengths may change, I'm using a shorter prefix than what > is currently being announced and adding a "orlonger" in an attempt to adapt > to this. > > Is there a BCP in this scenario? A stable (non changing) CIDR block? Does > Team CYMRU offer this? Is there a better solution to achieve the same > objective? > > Thank you for any thoughts. > > -b > In a simple scenario like yours link to your upstream can be considered as a "contributing route". There's no way to predict which block is the most stable on the Internet.
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