Seconded. In fact, this could probably be accomplished merely by announcing the space once with a bunch of prepends and ensuring the local preference attribute is greater than other routes Cogent might see for this space. 174:135, I believe, will raise it to 135, FWIW (5 above their default, IIRC).
-FC On Sun, Oct 26, 2008 at 9:08 AM, Nathan <[EMAIL PROTECTED]> wrote: > 2008/10/24 <[EMAIL PROTECTED]>: >> >> I have been trying to figure out how to do this and maybe someone will be >> able to help me out. >> >> I have two ISP connections ISP ATT and ISP Cogent. >> >> (ISP Cogent) (ISP ATT) >> | | >> RO ------------------- R1 >> >> >> ATT would be used for primarily internet and access to our webservers. >> >> Cogent would be primarily used to access Cognet's network that use VPN for >> incoming connections only. I do not want to have other networks besides >> Cogent's network using this path to access our webserver. >> >> I would like to have each other act as a backup for one another. For >> instance if ATT fails I want everyone on the internet use Cogent to access >> me. If Cogent fails I want everyone on the internet and the VPN connections >> on Cogent's network to use ATT. >> >> So basically what I was thinking to setup is to accept a default router from >> ATT and Cogent. Lower the local preference of Cogent and that way I would >> accomplish using ATT as primary internet access. > > I would: > > -- forget about conditionals > > -- advertise three routes to Cogent. My whole network, with a lot of > prepends, and the two halves of my network, without prepends but with > a community saying "don't export". > > -- receive from Cogent their networks (the VPN things you want) and > default. If necessary receive full routes and filter out non-default > non-Cogent routes. Set local preference lower than default on default > route from Cogent, and local-preference higher than default on Cogent > routes. > > -- advertise whole network to ATT, without prepends. > > -- receive default route from ATT, with default local-preference. > > If I've correctly understood what you want then that should do it. > > -- > HTH, > Nathan > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
