BGP Penalties in Single-Homed Networks
Date Posted: July 01, 2008 01:01 AM
Author: Mel Beckman
Dear Doctor, Our primary T1 Internet provider has frequent outages, so we're in the process of adding a second upstream Internet provider and will be running the Border Gateway Protocol (BGP) to provide automatic failover between the two providers. I have acquired the necessary Class C IP address space and the Autonomous System Number (ASN), and I have already set up BGP with our existing provider. Our new provider's circuit won't be installed for several weeks, but everything is configured on our router so that we can go live immediately. Alas, since enabling BGP, whenever our existing provider has an outage, we lose Internet connectivity for up to an hour! Our provider says it's "route flapping." What is that and how do we fix it?

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