1. Neighbor Up/Down: OSPF routers rely heavily on neighborship to exchange routing information. Therefore, identifying an OSPF neighbor up or down alert can be crucial in detecting OSPF issues.
1. High LSA volumes: In large OSPF networks, you may notice an increase in the LSA volume that has been transmitted or received. This could be an indication of a network event that needs attention.
1. Routing loops: Routing loops occur when routing information circulates between different routers in a network indefinitely. Such loops could result in packet loss or congestion and may cause routing instability in your OSPF network.
1. SPF calculation change: Any change in how the Shortest Path First (SPF) algorithm executes can significantly impact network performance. Hence, keep an eye out for any alert that suggests a sudden change in the way SPF calculations occur.
1. Interface failure: OSPF routers depend on interfaces to transmit and receive routing information. When either the physical or logical interfaces fail, alerts will be triggered indicating interface-related issues.
1. OSPF topology change: Potentially, any change to the OSPF network’s topology could signal an alert condition. Such changes could include the addition or removal of routers, changes in link costs, or a variation in network traffic patterns.
1. Authentication failure: OSPF routers require authentication to verify the identity of router neighbors. Therefore, any alert on authentication failure indicates a risk to OSPF’s security and requires prompt attention.