NNM and Routers
by John Blommers
OpenView Network Node Manager: Designing and Implementing an Enterprise Solution
- Copyright
- Preface
- Acknowledgements
- List of Figures
- List of Tables
- Author Biography
- The NNM Project Deployment Plan
- Introduction
- Determining the Requirements that NNM Must Satisfy
- Sharing Project Plans and Information on a Web Site
- Drafting, Defining, and Finalizing an Operations Agreement
- Choosing Scalable Hardware at Each NNM Site
- Setting the Scope and Conducting a Pilot Test
- Identifying, Developing, or Buying NNM Training
- Defining Management Domains
- Planning for Ongoing Problem Resolution
- Planning for System, Database, and Map Backup and Recovery
- The Benefit of Using ITO for NNM System Management
- The Value of Consultants, System Admins, and Project Managers
- The Victory Celebration
- Planning for Operational Patching and Upgrading
- Planning a Robust Domain Name System
- Introduction
- Why DNS Is So Important to NNM
- The History of /etc/hosts
- Router Interfaces and DNS
- Reliability Designs for DNS
- The Purpose and Use of Delegation
- Sample DNS Configuration Files
- Loading Factors for DNS Systems
- NNM Caching
- Primary, Secondary, and Other Mysteries
- The Bigger Picture of a DNS Implementation
- Defining the Management Domain
- The Excitement of First Discovery
- Introduction
- Discovery Without a seedfile
- Manually Guided Discovery
- Discovery Guided by a seedfile
- Demand Poll to Coax Along Discovery
- The Curse of Multiple SNMP Community Strings
- DNS Problems
- Fine-Tuning the Discovery Filter
- Tuning and Observing netmon Queues
- My Window Is Full of Icons
- Strategies for Containerizing the Internet Submap
- Saving Map Customizations
- Leveraging Lessons Learned With Other Map Builders
- Map Management Strategies
- Distributed Network Management
- Introduction
- The Management Station and Collection Station Relationship
- Configuring the Collection Station
- Deciding What Devices to Export
- Management Station SNMP Data Collection
- Monitoring NNM Systems With ITO and MeasureWare
- Configuring the Management Station
- Adding a Collection Station to an Operational Management Station
- The Impact of Rebuilding a Collection Station
- Configuration Management With NNM
- Event Management With NNM
- Performance Management with NNM
- Introduction
- Who Needs Performance Data?
- Providing Data for an SLA
- Determining Performance Data Retention Intervals
- Estimating SNMP Data Sample Rates
- The Heisenberg Uncertainty Principle of SNMP Polling
- How Much Traffic Does NNM Create?
- SNMP Performance Data in MIB2 and Private MIBs
- Strategies for Setting Threshold Values
- How to Create MIB Expressions
- Viewing Performance Data Online
- Presenting Performance Data to the Consumer
- SNMPv2c and 64-bit Counters
- Collecting RMON Data
- Crossing Over into HP NetMetrix
- Capacity Planning
- Conclusion
- Managing Firewall Environments With NNM
- Periodic Maintenance Tasks for NNM
- Introduction
- Using crontab Entries to Automate Backups
- Determining the Scope of the Backup
- Database Repairing
- Moving Newly Discovered Devices to Their Proper Container
- Backing Up Map Customizations
- Updating MIBs for New Devices
- Deleting Unwanted Maps
- Reviewing Configuration Alarms
- Perusing Log Files and Application Alarms
- Reviewing MeasureWare Data
- Perusing and Updating ITO Alarms
- A Day With NNM
- Troubleshooting NNM
- Cross-Platform Issues With NNM
- Staffing Issues for NNM
- Best Practices for NNM
- NNM Case Studies
- Glossary
NNM and Routers
A common problem is NNM combining two routers into a single node. This is usually caused by bad DNS data.
HSRP can be tricky, too, unless the correct flags are set in oid_to_type. Currently (June 2000), Cisco does not set the flags correctly when they install their element managers. A router running HSRP should be set to “GD”. Otherwise, netmon will continually add and delete the HSRP address.
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