nanog mailing list archives
Re: AW: /27 the new /24
From: William Waites <wwaites () tardis ed ac uk>
Date: Sat, 03 Oct 2015 11:57:07 +0100 (BST)
On Sat, 3 Oct 2015 12:42:01 +0200, Baldur Norddahl <baldur.norddahl () gmail com> said: > 2 million routes will not be enough if we go full /27. This is > not a scalable solution. Something else is needed to provide > multihoming for small networks (LISP?). It's not too far off though. One way of looking at it is, for each extra bit we allow, we potentially double the table size. So with 500k routes and a /24 limit now, we might expect 4 million with /27. Not exactly because it depends strongly on the distribution of prefix lengths, but probably not a bad guess. Also there are optimisations that I wonder if the vendors are doing to preserve TCAM such as aggregating adjacent networks with the same next hop into the supernet. That would mitigate the impact of wanton deaggregation at least and the algorithm doesn't look too hard. Do the big iron vendors do this? -w -- William Waites <wwaites () tardis ed ac uk> | School of Informatics http://tardis.ed.ac.uk/~wwaites/ | University of Edinburgh https://hubs.net.uk/ | HUBS AS60241 The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.
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Current thread:
- /27 the new /24 Justin Wilson - MTIN (Oct 02)
- AW: /27 the new /24 Jürgen Jaritsch (Oct 02)
- Re: AW: /27 the new /24 Max Tulyev (Oct 03)
- RE: AW: /27 the new /24 Jürgen Jaritsch (Oct 03)
- Re: AW: /27 the new /24 Youssef Bengelloun-Zahr (Oct 03)
- AW: AW: /27 the new /24 Jürgen Jaritsch (Oct 03)
- Re: AW: /27 the new /24 Baldur Norddahl (Oct 03)
- Re: AW: /27 the new /24 William Waites (Oct 03)
- Re: AW: /27 the new /24 Baldur Norddahl (Oct 03)
- Re: /27 the new /24 Owen DeLong (Oct 03)
- Re: /27 the new /24 Matthias Leisi (Oct 04)
- Re: /27 the new /24 Mel Beckman (Oct 04)
- Re: /27 the new /24 sthaug (Oct 04)
- Re: /27 the new /24 Mel Beckman (Oct 04)
- Re: /27 the new /24 Randy Bush (Oct 04)
- Re: /27 the new /24 Mel Beckman (Oct 04)
- Re: /27 the new /24 Jon Lewis (Oct 04)
- Re: /27 the new /24 Mel Beckman (Oct 04)
- Re: AW: /27 the new /24 Max Tulyev (Oct 03)
- AW: /27 the new /24 Jürgen Jaritsch (Oct 02)