nanog mailing list archives
RE: /24s run amuck... again
From: "Alexander, Nathan M" <nathan.alexander () qwest com>
Date: Fri, 19 Jul 2002 14:17:42 -0400
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 - Internal Use Only - Disclose and Distribute only to Qwest Employees and authorized persons working for Qwest. Disclosure outside of Qwest is prohibited without authorization.
-----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 wasa good timeto update my list of evil /24 announcers... There arecurrently 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
Current thread:
- /24s run amuck... again Richard A Steenbergen (Jul 18)
- Verio filtering... Would be nice if they at least honored what they said... Phil Rosenthal (Jul 18)
- Re: Verio filtering... Would be nice if they at least honored what they said... Jared Mauch (Jul 19)
- Re: /24s run amuck... again Ralph Doncaster (Jul 19)
- <Possible follow-ups>
- RE: /24s run amuck... again Alexander, Nathan M (Jul 19)
- Verio filtering... Would be nice if they at least honored what they said... Phil Rosenthal (Jul 18)