Your network now has enough built-in redundancy to survive the most common causes of network outages: failing connections, failing hardware, and failing ISPs. It's rare for two routers, connections, or ISPs to fail at the same time (but don't think it never happens), so the most common source of problems in a multihomed network is the BGP configuration itself. This chapter tells you how to diagnose and correct BGP problems quickly. Read this chapter carefully, imagine the impact on your network of each of the problems mentioned, and take action to minimize the damage that would result. But first a few paragraphs about handling the stress of troubleshooting network problems when an outage occurs.