[j-nsp] Conditionally Generating Default Routes

[Adam Vitkovsky]

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 prefix goes away, my "aggregate" default route is withdrawn.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.
 

adam
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