On 6/3/13 3:59 PM, Andrew McGregor wrote:
That's completely true; many switch chips cannot route on longer than
/64 prefixes, so attempting to do so starts to either heat up the
software slow path, or consume ACL entries, or is simply not supported
at all. While this is arguably a bug, it is also pretty much
ubiquitous in the current generation of ethernet switches, which are
the basis for the majority of routers.
please cite specifics. I have no devices in the field that have such a
limitation.
joel
On Tue, Jun 4, 2013 at 6:27 AM, Brian E Carpenter
<brian.e.carpen...@gmail.com <mailto:brian.e.carpen...@gmail.com>> wrote:
On 04/06/2013 03:44, manning bill wrote:
> On 2June2013Sunday, at 16:47, Sander Steffann wrote:
>
>> On 03/06/2013 11:06, manning bill wrote:
>>> /48's are a horrible policy - one should only advertise what
one is actually using.
>> Now *that* would cause a nice fragmented DFZ...
>> Sander
>>
>
>
> I'm going to inject a route. One route. why do you care if its a
/9, a /28, a /47, or a /121?
I've heard tell that there are routers that are designed to handle
prefixes up to /64 efficiently but have a much harder time with
prefixes longer than that, as a reasonable engineering trade-off.
Not being a router designer, I don't know how true this is.
Brian
Its -one- route.
> That one route covers everything I'm going to use… and nothing
I'm not.
>
> Is there a credible reason you want to be the vector of DDoS
attacks, by announcing dark space (by proxy aggregation)?
> Is that an operational liability you are willing to assume, just
so you can have "unfragmented" DFZ space?
>
>
> /bill
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