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RE: /24s run amuck... again
- From: Alexander, Nathan M
- Date: Fri Jul 19 14:23:33 2002
That is of limited usefulness. 1) They'd all have to have the same next
hop. 2) you would have to hear all three /24's of them from all your peers,
all with the same next hop, metrics, med, etc. Otherwise the aggregate
route becomes the backup route for other, more specific announcements of the
/24 that you can't aggregate. It would be nice for the single homed, but
then why are you running bgp?
Nathan Alexander
NMC Shift Manager
703/363-5293(office)
301/442-8695(cell)
877/541-2189(pager)
Nathan.Alexander@qwest.com
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> -----Original Message-----
> From: Ralph Doncaster [mailto:ralph@istop.com]
> Sent: Friday, July 19, 2002 8:07 AM
> To: Richard A Steenbergen
> Cc: nanog@merit.edu
> Subject: Re: /24s run amuck... again
>
>
>
> On Fri, 19 Jul 2002, Richard A Steenbergen wrote:
>
> > With all the recent talk about filtering, I figured now was
> a good time
> > to update my list of evil /24 announcers... There are
> currently over 63k
> > /24s out of 113k total unfiltered announcements (over 55%).
>
> Does anyone (Cisco, Juniper, etc.) have an auto-aggregation feature?
> Let's say a router that receives the following prefixes under
> a single AS
> 206.51.128.0/24
> 206.51.129.0/24
> 206.51.131.0/24
>
> And the following network is not in the table:
> 206.51.130.0/24
>
> Then it would be usefull to collapse it into a single 206.52.128/22
> aggregate (especially if the metrics & communities are the same).
>
> -Ralph
>
>
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