[164042] in North American Network Operators' Group
Re: /25's prefixes announced into global routing table?
daemon@ATHENA.MIT.EDU (Masataka Ohta)
Mon Jun 24 08:17:38 2013
Date: Mon, 24 Jun 2013 21:16:51 +0900
From: Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp>
To: nanog@nanog.org
In-Reply-To: <51C5A282.4010207@danysek.cz>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Daniel Suchy wrote:
>> There are techniques to fix that. For example, Simple Virtual Aggregation
>> http://tools.ietf.org/html/rfc6769
> I'm not sure, if hardware vendors will implement something like this. I
> expect they'll sell you router with larger hardware FIB instead.
As the RFC says:
Some routers in an Autonomous System (AS) announce an aggregate (the
VA prefix) in addition to the routes they already announce.
it assumes some routers in the AS have unaggregated routing table
entries.
Thus, even within the AS, the RFC is not very effective.
The RFC, either, does not help to reduce the number of routing
table entries exchanged between adjacent ASes.
Masataka Ohta
