We have a /20 assignment that I will be using on both sides. I intend to have a /24 on each side that will fail over.
-Ty On Mar 19, 2014 5:19 PM, "Mike Hammett" <[email protected]> wrote: > Just as an example, if you have a /23 from both providers, announce that > /23 on both connections. Then, advertise the two /24s comprising the /23 on > the ISP you want to use it from. I believe BGP will take a longer prefix > before a prepend. The smallest you can advertise, though, is a /24, so if > your blocks are smaller, that won't work. > > > > > ----- > Mike Hammett > Intelligent Computing Solutions > http://www.ics-il.com > > ----- Original Message ----- > > From: "Ty Featherling" <[email protected]> > To: "Mikrotik discussions" <[email protected]> > Sent: Wednesday, March 19, 2014 2:11:43 PM > Subject: [Mikrotik] BGP guidance > > I am ready to begin turning up BGP on both of my edge routers and start > advertising my new IPv4 assignment. I am want to make sure I understand > things clearly first. > > These were setup as two separate networks, each with their own upstream. We > built out between them and got a backhaul between the two so we could > manage the far network from the one we have our office already on. I turned > up OSPF recently on all routers and the routes for both networks are shared > between the two edge routers. > > Now we have our own IP space and would like to start advertising/using it. > That seems easy enough. Turn BGP on between the edge routers and our > upstream providers and advertise some addresses on one and some on the > other. The real fun begins when we want to have fail-over between the two. > Initially this will only be for some VIP clients like ISDs and Hospitals. > In the event of an outage upstream of either network I would like to make > sure these clients stay up across the backhaul between networks. > > I believe the way to accomplish this is just to announce the space used by > those clients to both upstream ASes and just prepend the ones that normally > live on the other network. That way should the upstream go down, the > "farther" path will become active. Beyond that I just need to have iBGP > running between my two edge routers so those routes are known. Does this > sound right? > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://mail.butchevans.com/pipermail/mikrotik/attachments/20140319/5b3303be/attachment.html > > > _______________________________________________ > Mikrotik mailing list > [email protected] > http://mail.butchevans.com/mailman/listinfo/mikrotik > > Visit http://blog.butchevans.com/ for tutorials related to Mikrotik > RouterOS > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://mail.butchevans.com/pipermail/mikrotik/attachments/20140319/da153495/attachment.html > > > _______________________________________________ > Mikrotik mailing list > [email protected] > http://mail.butchevans.com/mailman/listinfo/mikrotik > > Visit http://blog.butchevans.com/ for tutorials related to Mikrotik > RouterOS > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.butchevans.com/pipermail/mikrotik/attachments/20140319/9631979e/attachment.html> _______________________________________________ Mikrotik mailing list [email protected] http://mail.butchevans.com/mailman/listinfo/mikrotik Visit http://blog.butchevans.com/ for tutorials related to Mikrotik RouterOS
