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Re: IP failover/migration question.
On Sun, 11 Jun 2006, Andrew Warfield wrote: > > I think there is some cisco magic you could do with 'dial backup'... you > > may even be able to rig this up with an ibgp session (even if that goes > > out over the external provider) to swing the routes. > > > > NOTE: this could make your site oscillate if there are connectivity issues > > between the sites, it could get messy FAST, and it could be hard to > > troubleshoot. Basically look before you leap :) > > > > This link may b e of assistance: > > http://tinyurl.com/l8zpm > > This link asks me for a login... aw crap, sorry... try: http://tinyurl.com/zh7wk (12.0 code reference infos) > > > to get greed into it.. are you sure you want to be 'stuck' with a single > > carrier? :) What if the carrier dies wouldn't you want redundant carrier > > links as well? > > I'd love a multi-ISP solution. I just assumed that anything involving > more than a single upstream AS across the two links would leave me > having to consider BGP convergence instead of just IGP reconfig. I both are bgp convergence actually, unless the routes are put from BGP -> IGP inside the single provider, which is a little scary. Consider that loctions A and B exist. A is primary, B secondary. B's routes don't exist in ISP's network. A explodes, the network above A has to withdraw the routes, the network above B (it's not the same POP nor POP router right?) has to get new routes from B then send them out. You'll gain SOME possibly, but that probably depends on the bgp/ibgp architecture inside the ISP in question :( > didn't presume that that would likely be something that happened in > seconds. If there's a fast approach to be had here, I'd love to hear > it. > get with the greed man! :)