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This chapter is from the book

This chapter is from the book

CCNP Security Virtual Private Networks SVPN 300-730 Official Cert GuideCCNP Security Virtual Private Networks SVPN 300-730 Official Cert Guide

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This chapter is from the book

This chapter is from the book

CCNP Security Virtual Private Networks SVPN 300-730 Official Cert GuideCCNP Security Virtual Private Networks SVPN 300-730 Official Cert Guide

Learn More Buy

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

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