No. of routers carrying full routes?
David Carmean
dlc at silcom.com
Mon Oct 21 05:41:46 UTC 1996
In a previous message, Alan Hannan wrote:
>
>
> [ Dave wrote: ]
>
> > I need to convince someone that singly-homed customer route flaps/
> > withdrawals should *not* propagate beyond our AS. I've found some
> > discussion of this in the July NANOG archives, and talk about cisco
> > floating statics, etc... and that "one-way" traffic is insignificant.
>
> Uhm, I'm not sure the concensus was that they shouldn't. I
> believe most everyone would agree that flaps w/in CIDR blocks
> should not propogate, and that people should only announce the
> most general network possible.
>
> But, if you've got a customer singly-homed to me, ideally, from an
> architecturely scalable point of view, you would do well to static
> them to your aggregation/POP router.
>
> However, I'm not sure a quorum agreed that single-homed customers
> should show up in backbone tables if their routes are/were down.
>
> There are points to be made both ways, but the BB routing tables
> are meant to be a snapshot of the net, and if a vector points to
> provider P, and customer C is not reachable there, I don't really
> think P should announce such....
Well, if C is aggregated into one of my blocks, and they go away for
a while, I'm gonna either blackhole it or send an Unreachable. The
same as I would if their non-aggregated route is not withdrawn. CIDR/
aggregation pushes this out to the edges anyway, so I'd think that this
is of far lesser consequence than thrashing the defaultless/core routers.
I suppose the folks who run said routers would know more than I could
at this point....
--
David Carmean WB6YZM DC574 <dlc at silcom.com>
System/Network Administration, Silicon Beach Communications
Unsolicited commercial e-mail not accepted. Violators will be LARTed.
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