Hello Network Friends,
I ran into an issue where I think I have the fix, but don't quite understand the problem.. I found the fix I think by just punching in the right words in google search. The fix for this issue I believe is route-tagging
so if you look at the image that I put in the link. we have an issue where before that 10gig circuit was stood up, if any branch wanted to go to Datacenter 2, it would go straight there through the MPLS and vice versa...and also if any branch wanted to go to Datacenter1 it would go straight there and vice versa as well....Life was good until the 10gig circuit went up. So the 10gig circuits been up for a month or so and I noticed that for some routes that want to go to a branch, I notice that it traverses the 10 gig link to get there....why I wonder!?
For example, if lets say a computer in datacenter1 wants to reach a branch computer, it traverses through the 10 gig link to datacenter2, then down the MPLS to the branch computer...so instead of going straight down the MPLS off datacenter 1 like it used to, it takes the longer road through the 10gig circuit to get there... BUT this is not the case for every route...some will take the correct route of going straight down the MPLS to get to the destination and some will take the 10gig path through the other datacenter to get there. so I guess I understand that redistribution is causing this problem since it seems kind of messy....but I can't be sure. In the image I mention how we redistribute all the routes between BGP -> EIGRP and vice versa. The part I don't understand is why would it ever choose the correct shorter path for some routes, but not for others...
Please let me know if you need more details.
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