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- “Do I Know This Already?” Quiz
- Foundation Topics
- DMVPN Overview
- DVMPN Network Components
- DMVPN Design Considerations
- DMVPN Phase 1 Hub-and-Spoke Implementation
- DMVPN Phase 2 Spoke-to-Spoke Implementation
- DMVPN Phase 3 Spoke-to-Spoke Implementation
- DMVPN Troubleshooting
- Summary
- References
- Exam Preparation Tasks
- Review All Key Topics
- Complete Tables and Lists from Memory
- Define Key Terms
This chapter is from the book
This chapter is from the book
This chapter is from the book
This chapter is from the book
DMVPN Phase 3 Spoke-to-Spoke Implementation
As mentioned earlier in this chapter, DMVPN phase 2 suffers from scale limitations that are addressed in DMVPN phase 3. To transition from DMVPN phase 2 to DMVPN phase 3, we will make two simple changes on the hub-and-spoke routers.
Enable NHRP Redirects on the Hub
On the hub router, enable NHRP redirects with the command ip nhrp redirect. The redirect command enables the hub to issue redirects, informing the spoke of a better path if such a path exists. Example 5-27 shows an example of doing this on the hub router.
Example 5-27 Enabling NHRP Redirects on the Hub Router
HQ-Router(config)# interface tunnel 1 HQ-Router(config-if)# ip nhrp redirect
Enable NHRP Shortcuts on the Spoke
On the spoke router, enable NHRP shortcuts with the command ip nhrp shortcut. The shortcut command enables the spoke to accept redirect messages issues by the hub. Example 5-28 shows an example of doing this on a spoke router.
Example 5-28 Enabling NHRP Shortcuts on the Spoke Router
Spoke1(config)# interface tunnel 1 Spoke1(config-if)# ip nhrp shortcut