"Tactical" /24 announcements

Tom Hill tom at ninjabadger.net
Thu Aug 12 17:20:05 UTC 2021

On 12/08/2021 18:09, Jon Lewis wrote:
>> Having an upstream provider that did it, in a very aggressive
>> fashion.
> Odds are, they did it wrong, and you had no control and limited, if
> any, visibility into what they did.  Obviously, if you're going to
> blindly filter routes based on prefix-length, you need to point
> default at something that doesn't...and if you're acting as a transit
> provider, you're likely no longer able to provide "full routes" to
> customers from devices doing this or fed the "not so full table" from
> devices doing it.

Yes. This is precisely why I wrote my initial email, and perhaps I
wasn't specific enough, but it was a fairly generic warning against
"bright ideas" that don't include the proper scrutiny (or _do_ include
unnecessary amounts of arrogance).

> Arista.  They call it FIB compression.  They mention it's a
> trade-off, more memory and CPU utilization (keeping track of things)
> in exchange for being able to keep hardware that might otherwise be
> out of FIB space able to cope with full tables.

Ah, thank you, noted.


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