I currently do this for one of my sites and haven't had any issues. You just get a LOA from the ISP you get your /24 from and send it to the other ISP. Easy Peasy.
On Wed, Sep 15, 2010 at 10:30 AM, Heath Jones <hj1...@gmail.com> wrote: > Jon there seems to be a bit of a common belief that advertising a /24 or > some prefix that has been assigned by a provider, out to another provider, > is bad practise. I don't get it either and haven't seen issues myself. > > The only scenario I can think of is (in some odd configurations) when the > original provider sees part of their own network being advertised by another > ISP, they filter it and it breaks connectivity, or the original provider's > igp contains that prefix somehow already.. ? > > > > > > > On 15 September 2010 16:17, Jon Lewis <jle...@lewis.org> wrote: > >> On Wed, 15 Sep 2010, Voigt, Thomas wrote: >> >> Hi Rocker, >>> >>> Rocker Feller wrote: >>> >>> I am pretty new to this concept and would appreciate any >>>> guidance on how as >>>> a customer I can achieve redundacy with autofailover between 2 ISPs. >>>> >>> >>> You need PI space to do this. Because each ISP can only route his own PA >>> spaces plus the PI spaces from his customers. >>> >> >> You don't need PI space to multihome. At least not in the ARIN region. You >> do generally need at least a /24 if you want any reasonable chance of "the >> internet" accepting your BGP announcement. >> >> >> ---------------------------------------------------------------------- >> Jon Lewis, MCP :) | I route >> Senior Network Engineer | therefore you are >> Atlantic Net | >> _________ http://www.lewis.org/~jlewis/pgp for PGP public key_________ >> _______________________________________________ >> cisco-nsp mailing list cisco-...@puck.nether.net >> https://puck.nether.net/mailman/listinfo/cisco-nsp >> archive at http://puck.nether.net/pipermail/cisco-nsp/ >> > _______________________________________________ > cisco-nsp mailing list cisco-...@puck.nether.net > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/