We are currently multihomed with three providers. We want to drop one of the providers, but seem to be unable to do so. I padded the routes out to the provider we wished to drop with our AS, and proper routing seemed to propagate. (with these guys not in most of the routes back to us). I shutdown the connection, and the routes fail to converge. As a matter of fact, a shorter route gets propagated anew from this AS, which is now unreachable. Could this be due to static routes being advertised from the ISP in question, even though I'm no longer connected to them? Censored and modified config attached. We wish to drop ChoiceOne, AS 13609
If you do not see this shorter path when you are peering with this provider, I would hazard a guess that the provider has static routes with high administrative distance pointing to you. When it no longer learns these routes via EBGP with your router, the floating static routes kick in and are redistributed into BGP.
The only way to really find out what they have done is to ask the provider, I suppose...
Thanks Paresh, Martin, this was my thought also so I contacted the upstream... Actually discovered this because I wanted to test failover, and can't... The upstream made some unspecified change and actually made things worse. For two of my networks all protocols are slowed, traceroutes time out at a distance (usually 13-17 hops). And still I can't break their connection without being blackholed. This is Choice One (AS13609)... in the future my last choice...Wish me luck.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
Im studying the 100-105 book by Odom and am currently on the topic of Port security. I purchased a used 2960 and I'm trying to follow a...
While deploying a number of 18xx/2802/3802 model access points (APs), which run AP-COS as their operating platform. It can be observed on some occasions that while many of their access points were able to join the fabric WLC withou...
I am going to design and build an LAN network under a tunnel underground with long distance between the switches.
I will have 2 Catalyst switches and 8 Industrial IE3000, and they will be connected with fiber.
For now I am planning on use Layer-2 s...