Problem Summary An enterprise site experienced sporadic loss of connectivity to external services and some internal prefixes. The issue appeared after a change request to redistribute OSPF into BGP and vice versa at the WAN edge. Symptoms Observed Example output: Root Cause Analysis The team […]
![Ticket#24: Routing Table Blackhole – Route Redistribution Loop Detected Between OSPF and BGP [CCNP Enterprise]](https://networkjourney.com/wp-content/uploads/2025/07/Ticket24_Routing-Table-Blackhole-–-Route-Redistribution-Loop-Detected-Between-OSPF-and-BGP_networkjourney.png)
![BGP Prefix Filtering – Control What You Advertise and Accept [ CCNP ENTERPRISE ]_networkjourney](https://networkjourney.com/wp-content/uploads/2025/06/BGP-Prefix-Filtering-–-Control-What-You-Advertise-and-Accept-CCNP-ENTERPRISE-.png)