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SEC0013 - DMVPN DHCP Tunnel Support

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The video presents an alternative to assigning IP address to DMVPN spoke tunnel interface using a centralized DHCP server. We look at this feature in a dual-hub environment, point out some routing caveats with return DHCP packet to the router acting as a relay agent, and a quick resolution.

Statically assigned IP, although provide network stability and predictability, requires the DMVPN cloud IP space to be separately managed. Dynamically assigned IP via DHCP, on the other hand, eliminates the IP management effort, but introduces another potential point of failure. Which method of IP assignment you use would be a design decision.  
 
Topic includes
  • DHCP Tunnel Support Feature on DMVPN
  • DHCP Relay Agent and Server
  • EIGRP Routing with Dual-Hub Routers
Notes:
  • DHCP broadcast packets from a spoke are converted to unicast towards the hub router
  • DHCP broadcast packets from a spoke are not relayed to other spokes
Quick Facts
  • Feature available on IOS 15.1(3)T

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.