Chapter 9. Monitoring for High Availability
High availability is not something that is stumbled upon accidentally. Planning, deploying, and maintaining a network requires a staff of hard-working individuals who actually know what they are doing. The tasks required to maintain high availability in your network do not end with your configuration of Virtual Router Redundancy Protocol (VRRP), Graceful Restart (GR), or routing engine (RE) failover, but encompass the ability of your personnel to monitor the network and head off any errors that could degrade service.
Through the use of logging, Simple Network Management Protocol (SNMP), and traffic flow monitoring, the resourceful network engineer is able to diagnose issues that could lead to network downtime, and plan for a solution to the issue.
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