Case Study: In the Trenches with OSPF
This case study is intended to describe a real-world case where this problem actually occurred and to identify how it was corrected. The case study then outlines some lessons to help prevent the problem from happening again. The troubleshooting model introduced earlier in this chapter is used throughout this case study as a process to reference when performing network troubleshooting.
Recently, a large broadcast storm occurred in an OSPF enterprise network, affecting a region of the network that consisted of approximately 50 geographically separate sites consisting of over 75 routers serving approximately 3000 users. This condition brought all user WAN traffic in the impacted area to a standstill.