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SEC0012 - DMVPN NHS Cluster and Recovery Backup
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Security
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 Chiewanichakorn, CCIE#23585 (Ent. Infra, 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 technologies.