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SEC0012 - DMVPN NHS Cluster and Recovery Backup

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The video demonstrates another method of achieving redundancy in your DMVPN deployment using NHS cluster and recovery backup feature. We look at how routing and EIGRP neighbor adjacency changes when a spoke registers to one or more NHS at a time in the same cluster, and observe the failover behavior. This feature provides a good compromise between failover time and routing simplicity.

Topic includes
  • NHS Cluster and Priority
  • DMVPN failover test
Notes:
  • NHS are grouped into clusters (for example, by datacenter)
  • Failover occurs by a spoke register to backup NHS in order of NHS priority within the cluster instead of relying on routing protocol
  • It may take longer for routing protocol to recover during failover but the routing is simplified and the issue with asymmetrical routing is eliminated when a spoke registers to one NHS at a time
Quick Facts
  • Feature available on IOS 15.1(2)T
  • NHS priority range is 0-255 with 0 being the highest priority

About Author

Metha Cheiwanichakorn, CCIE#23585 (RS, Sec, SP), is a Cisco networking enthusiast with years of experience in the industry. He is currently working as a consulting engineer for a Cisco partner. As a founder of and an instructor at labminutes.com, Metha enjoys learning and challenges himself with new Cisco technologies.