Re: BGP Convergence Time
* [EMAIL PROTECTED] [EMAIL PROTECTED] [2007-05-12 03:06]: Well my question is when i take one of the routers down, I seem to suffer reachability problems to certain networks due to BGP convergence issues. At least this is what I believe is the cause of the reachability issues. How do others deal with this? How do I minimize the BGP convergence time as much as possible. well, you can modify the various timers of course, but it is not going to make all that much of a difference. well, actually it could, if your two uplink providers peer closely. in short, it's the way things are. bgp does not prevent downtime for everybody completely, it bribgs connectivirty back quickly after line failures. btw, bgpd notices line failure way way way way fatser when that results in a link state change on the interface, -- Henning Brauer, [EMAIL PROTECTED], [EMAIL PROTECTED] BS Web Services, http://bsws.de Full-Service ISP - Secure Hosting, Mail and DNS Services Dedicated Servers, Rootservers, Application Hosting - Hamburg Amsterdam
BGP Convergence Time
I have 2 boxes connected independantly to two providers with a sangoma T1 card. I have a crossover between the 2 routers which iBGP session is talking over and the 3rd network interface drops down into 2 switches. going to redundant firewalls running carp/pfsync. We currently use BGP in our office to advertise our /24 network via both providers. We use the set prepend-self x to manipulate the incoming bandwidth to try and get as even of a distribution of traffic as we can. Outgoing bandwidth is a little harder to manipulate it seems because it looks to be based on the better connected provider. Point is I wanna use both providers links simultaneously and not just wanna have 1 for backup sitting ideally. Well my question is when i take one of the routers down, I seem to suffer reachability problems to certain networks due to BGP convergence issues. At least this is what I believe is the cause of the reachability issues. How do others deal with this? How do I minimize the BGP convergence time as much as possible. In our data center we will be using a private as and BGP because they do not offer an HSRP gateway. This will be an active/backup scenario so I dont think I will any reachibility issues with the BGP convergence time in this enviornment as BGP updates only need to propogate within our providers AS which should happen relatively quickly. Am I correct in this assumption? Unfortuanately, we plan to migrate our data center enviornment to a public AS number when we bring in a 2nd provider. Since any downtime or network reachibility issues will be completely unacceptable in our data center, BGP convergence is a major issue. How do I deal with this? How do others deal with this?
